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Abstract

The occurrence of wildfire threats has increased in the last few decades creating serious challenges for thousands of communities around the world. Understanding the physical and social dynamics imposed by wildfires is fundamental to assessing and reducing the ensuing risk to different communities. Although, several studies investigating household wildfire risk perception and decision-making are available in the literature, modelling solutions to predict household behaviour in wildfire scenarios are still in their early stages. Hence the lack of a behavioural model suitable for embedding within a simulation tool. In this paper, we propose a mathematical framework aimed at simulating how householders perceive the risk associated to wildfires and how they take protective actions in response to such threats. A conceptual Wildfire Decision Model, based on nine assumptions derived from existing literature on human behaviour in wildfires, is introduced. A mathematical framework is then proposed to implement such a model within a simulation tool. The proposed modelling solution can help identify the information required to generate new dynamic and behavioural travel demand models for wildfire evacuation.
A Modelling Framework for Householder Decision-Making for Wildre Emergencies

Abstract

    ! "  
 " #             $
  %       "" 
& # "#
'# #
 # 
(  ""  ""           
"""
%")*+# " ,
    #     %      
"" "   "" 
" -       #  

Keywords./ #/& // 
1. Introduc#on
 " 
0     ) !# ( 1)!(2
#3456
3786) "
         396 :    - 
"";
!" < $
" #""
 "  =#""
 ">  $# 396%
"> #
39?6 ' "#" 
#0 "# 

@   0       
"" 3;6##
    #   #  1 
 3A:4B62   "   ""     
#"344:476%#
$"""##=3;6
## 
" >    "   &
   3486
   > #""
     349:4C6' ""  
396 "  
 "-"""
 3485B6% #""# 396
=3;6 396 , "" -
"    ""    =   3;6 ,  
# "'
"  " - "  
  & "#% 
  ,"  &   "
" ""
%  #" 
"- #
 &#   +   
#& $
$& """$ 
"#12 %  " "
     "    
"" ""
    ""   "          
"       "
"(""")*+#
 " ""# #
  ""        
  &="  
"#  ,   "  &
   %  "    D "  "
      #    ""    # 
$ ##
 ""  
"
 # "# 354:5?6
E""   
 -  , &
#    " "  F G 3A456  
3475;6  "  3C:445A5C6 '  &   > 
# "&  
2. Background
+ # 
$#       # " "
#$& 
@ " #" 
<H%*+1H%*+2#H
37B6   I    "  "
  #  # J 3746 "" F
# #"I
#12 
H1(H2""
 #" "375:7?6D "
#," # .
"1 37;:8B62" # & "
   " &  " 3846  " 1
37862" #"""
"   "" 
=E,& "
1K"#    2  " "
,"  F  "
 K" " 37C6 =  J   "  &
#   "  0   - # " 
 " "" " 
 37;7A6% "& 
J   # "     "
 #-I"
# " 
"  #  &  "  "#  " 
""    " 1   #  "< 
23757785:886
396 1J2
""& "$
  = +& ) 3896 38?6 )  38;6
"   I& " 
#,12#
"    # - 1 # "   ,
#"> "2     I  &
"*&  "#) 1
     38?6   =  38A6 '  38C6  L
)39B62# "
" =, "HFH%*+  37B6
#         ""    3946 % 
" ""  #=  3;6" H%*+  "
F& "$"
"", 1#= 3962  
""H%*+ # 
    H%*+     ""   "    
" 
F#1"&2
$""& "= 3;6
     &     H%*+   $ 1 "&
 1" D  "2  #    
" 2( $F#
#  # "    $
#""&(&H1(H2%,
" #142 "" 1
 " "##2/152
 # " 1"##
2@D "- "
" 395976H3956    "
"+ 3976 "   # 
"       #  ""   
"   "       "     & 
"
,   "
""   
   #          "" 
1(H2
'&  " # #
"# 396"" #""
      &        
-.M)"NOM)
"#O
3. Modelling Assump#ons
)*+   & 
"  "            
 " "H%*+""#H
37B6"I   # "  &
  "" "# *
+#3986,"#3876 
& ##-#3996#
# 3796%  """ 
 387986        "     
 "")*+ <#
     

 
 " "     # 
 ""1
K" "  "      "  
2 " 
 - 
 "    "  
1          2 + 
        #  " " 
 : # " 38?6 %       
 !--
"     #       >
 3746  ""          " #
#        #
#""" % "
    1 "2    
34;6
" #     
$
""" ,
""""1,"
,"  0   ""    2  "   
"37B8;9?6(#"
 "        #    
-. M(    (   " D NO  M* (   
"NO34""8;6*"-& 
   "    "
#.         
"  " " 34
""9B4B6
% &!'
 ()*
! &)*
 +)*
 #)
 " #  # 356   
#3996 
, 0 "  #  "  #
#  "   #   < # $ 
# %    " "   "  
##("" "
#
#1()2 ###"
  1&
)2@1#"2#"
   " 1"& 2    
 # "
1+)2(K"
"#"#1#)2
+) #/
"K#"& 
:, ""=, "
 &  
    "M  O#   
3C455A6 "#$
" /+)
,!
- 35;6P
 "" # $"   
D
. /      !   

 "#.&
&3C455A6'
"1(H2 "#
"""K"% 
 #""
   D  # #  D "  
##:
""""3C6 
"      # - 
""  " " "  
#  "396
## #
=  D """
"    (H %  (H  Q   #"  3C6 ( 
"   ""   
 # "-"  
 #35A6
0 1
 2
   3 3    1 
4 
, "#& 
",#
" 1"2 D
 34""8?6+,
 #"
,"$ &  ,  " 
#3;6( ""&"
 " #
39A9C6
5 6!7
1
%H%*+""#H,
      #0 "&
" 34 "" 8A6 ,    #  " D  
 " #&  #   #
H#,""=
%$ 3?B?46    "     &  
#%$J%$%$
""FDJ
%$""
8 919 

  " D "
% &  #  #
  # 34
""8C6 # "
      ,     "   
,  " 3?56'
  "   " 
"1:2  " # 1;2 (      
  "     " #   - 
-4
Y=α+
i
βifi
(
Xi
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-4
 "  #  " 
$ &    3?7?86' 
 "       "  "   # 
 ","#"
< =19

% " 7   # &   
#"##
  $ # #  ,   <      
  <  &       
"$#& F& "
"","
3C:445A5C6
> 7!$
  "# " #  
3?9??6 E      "#   , # 
 1 2 " 
 "," 3?;6=H,?@A
13!
-37B6 """
# 396
 " #   #   "  = 4) 
,"  "   "=4#    
     " #      "   
   #  1     "2  
"$#,1 "
   2  & F   1   " 
2,#"D "
I"#H" #
$ #    " ( "
  I     &
  3?;6
& F#"""@
 "  ,    1
RI
RV

RP
= 4#2&
#/ ,*"
   $"    1  2  
#0$##
,# #D =4#
    # $   "" 1  
 ," " 2# 
"=4#
"""   =  " "
#  #  &#  &# ""    ""    
""  &"D""  "
"" 
 1 ""
2
12
1#2
=4:J" .12#1#2,"
4. Model Specica#on
  "" " ""
   $    
Ri(t)
        
#    -    #  1% " 5&7
L  ( PH 2 %% " 9; -
   #
Ri(t)
    ,  1 "   
    2    1  " ""   
","& #.
Ri
(
t
)
=f
(
FE(t), F I
)
-5
      , 1
2
1
FI(t)=
{
F1
I, , F i
I, , Fm
I
}
21 """
 ","G2 
     E     ,    
J "-5#D.
Ri
(
t
)
=
i=1
n
βi
EwiFi
E+
i=1
m
βi
IFi
I
-7

βi
E

βi
I
"  ",
   "
βi
E
 # $ #  #      %
    #  
#1% " 72
wi
  "    ,"
1""D"2 " ,
Fi
E
1% "?2 "
βi
E

βi
I
 
""
wi
"  "  -   " 
<
    "      . ,
18421852#1
872   1 882     
1792
.B1C
=#, "F
 ""            
 "  #   3;6
*"$ #
""   1"# 
   2 3;6E
# ""#4 "#
Fi
E
#
"" #3;6(
 # " ##
,
#4:,$""
1MRO" "/MSM "2
Factor Wildre Hurricane Reference
P#  +34B5C6
 #K=# +34B5C6
=  +34B5C6
=K'",  + + 34B5C?A?C6
@# +34B6
K +R 3;B;46
%    "  "    ""/   " 
'# "# :
       %    # ,"  
"#<1 2
 " "" %#
 "," %
#"" 3A6 .  
  # D4 =#4 &&     K  
#
    $  "   F ,"  ,  1
"" D " 2   "  D
")D35A6, 
  F ,"         %
E  (   #              "
F ,"=  ," , #  
##  34?;56
 $  ""  
wi
" - 7
" #<,D "
M4O%"##""#J#
 "E#
b(w¿¿ip)¿
# 
wi
" .
b(w¿¿ip)=
{
1; pi
0;(1pi)¿
-8

pi
"## ,1
Fi
E
2"D
"## "# 
."&C
H  "F
""
Fi
I
#5""#
""""3;6
#5:($""
1MRO" "/MSM "2
Factor Wildre Hurricane Reference
% 3;46
(  +3;4;76
 +3;B;46
1 2 + + 3;B;86
  3;B;76
H""  +3;B6
H," +±3;B;4;96
4J -"   # #
 ,"  "  " -        "
  #L(
 " -" ##""
## 3;?6
"" ""
 "  %  $F" 
( 3;46 1 2
   ""     ##    
   35A;B;76     $  " 
"" " "  %  
,"","#
  "" 3;B;4;96 ' ,"      
 """3;46
+ ""   " ""' 
  I =E 3;B6 #   
 '3;46
","  " ""#  "
""  #-7
.%=D
E """ 1% "C2
#  "
" -## #
  1
ε
2-5"## "
#  $  
 " F  # "
#$ # 9
 9    - 5  # D    
  
f
  
ε
-9
Ri
(
tβ
)
=fi
(
t
)
+ε(0, σ )=fi
(
FE(t), F I
)
+ε(0, σ )
-9

β
" $ "
βi
E

βi
I

-7
ε
  # -<
 1
σ
2 *$ #  #   
ε
   # 
#"# " 
8
%"# ## 
β
" 
     )      "    
"## # #C
βθ

θ
    "  < 
"## # (          $ F
 ," " " 
 #  "     
#3;;:;C6 349634A4CAB6"
Q
..E=)
%  % "7  $# 1(
)3 &)3+ )3  # )2 "  
"""%
1
RI
RV

RP
2""&
" =4#! "#
##7
E#
Ri
 -%"#
 F ""' "#
"####-?
#7:"##
Behavioural state Risk Value
L 
<Ri
(
tβ
)
RI
(
RI<Ri
(
tβ
)
<RV
P
RV<Ri
(
tβ
)
<RP
H
RP<Ri
(
tβ
)
<+
PN ,i =P
(
<Ri
(
tβ
)
R I
)
=C
(
RIfi
(
t
)
)
PI ,i=P
(
RI<Ri
(
tβ
)
<RV
)
=C
(
RVfi
(
t
)
)
C
(
RIfi
(
t
)
)
PV , i=P
(
RV<Ri
(
tβ
)
<RP
)
=C
(
RPfi
(
t
)
)
C
(
RVfi
(
t
)
)
PP ,i=P
(
RP<Ri
(
tβ
)
<+
)
=1C
(
RPfi
(
t
)
)
-?

PN ,i
PI ,i
PV , i

PP ,i
 "##   #    
   "  "    ,"  
"    F     #     
ε
 
-9=5"""-?(=5"#
#
PN ,i

PI ,i

PV , i

PP ,i
" "
fi
(
t
)

 "##  " " #     #  "
  
ε

PN ,i
# 
PP ,i

12
1#2
=5:P"-9 ""12
1#2
- ?        #       
"#
ε
  =  
 < # F      
-?"@ 3A46
.0G))
@     "  1  882    
"1% "82+"##
" 3C:445A5C6%#
"#.(H%"#
"=7#"
=7:H
## #
1% "82& #  
"#"=7# =  " 
"& "#  ##
""( "
 
%"#  #   
$##  ,   <    
<  &  1% " A2 %      
 "#," 1
#  "2 J % " C#
  =  "    #  # 
" " "1
""""2% # 
&  3A56!  "  "##    
1
Pi
L
21
Pi
D
2(H1
Pi
SIP
2#-;
Pi
L=eμV i
L
eµ V i
L+eμ Ii
S
Pi
S=eμ Ii
S
eμ V i
L+eμ Ii
S
Pi
F=Pi
SP
(
fight
|
stay
)
=Pi
SeµSVi
F
eµSVi
F+eµSVi
SIP
Pi
SIP =Pi
SP
(
SIP
|
stay
)
=Pi
SeµSVi
SIP
eµSVi
F+eµSVi
SIP
Ii
S=1
µS
ln (eµSVi
F+eµSVi
SIP)
-;

µS
"#  TF

Pi
S
"##14&
Pi
L
2
Vi
L

Vi
F

Vi
SIP
  
          (H  % 
% "C-#,1
FE(t), F I
2%
   # 8  1(L2, 1U2 
#"" 3;6( #
 " ##,
#8   "    "     
(H'  #
 "   # =    3;96   
 #     #K
      "          
#  "   +<  3;76  
 " +
     "   "      3;76 =
  "    K  1  "2    
"3;76
 "  =, " ","
    "   3;?A76'
   # # E 3;B6 %  ##   3A86" 
" "+34B6
 "( " "
,"#$# ,"
#8&(,$"& 1MRO"
 "/MSM "2
ID Factor Nature Leave Defend SIP Reference
4 "" (L R R 3455;;7;9A96
5 1 2 (L R 35A95;7;?A7A?:AA6
7 1 2 (L R
8H
1 2 (L R 3;76
9  "" (L R R 3956
? % (L R 3AA6
; (  (L R 3956
A ," U R R 3455CAA6
CH" 1 
""2 (L R 35C;7A8AA6
4B E (L R 3AA6
44 H," (L V 3;B;9;?A76
45 &> (L R
3A96397647 "&> (L R
48 &< (L R
49 '&"" 
# (L R 3A86
4? ' U R 3A9AA6
4; =  (L R 3456
4A & (L R 3A96
4C '" U R 3;7A96
5B ' U R 3;7A8A96
54 J D  (L R 3455CAA6
55 H"D  (L R 3455CA7A9AA6
57 )   
 (L R 3956
58
'   
"     

U R 3A86
59 &"# (L R 35C956
5?  U R 3;96
5; %  
  U R 3A?6
5A %   
#W U R 3A?AA6
5C %   
 W U R 3;7A?AA6
7B + 
 U R 3;76
74 H   
 U R 3A86
75  U R 3AA6
W
%"
 1""2"##-; 
 #  ""#      
" #""3C5A6
5. Model Calibra#on
( """ ##
 3A6#3A6"## "
F##8%
# " "#
 +  ""   142    
 "      "  .    1   
"    "##    2/  152    
 #  "   1  "##
 2 % ""  " 
"  F         " G
"
0)
#3A6&"
89;%,"#(
     #   89/     
 "    ""     (H 
# "# 
 "    "        
"
   3A6 " "      
     #  $ # 42  X 5B48 #  H
+'H'52X5B49#$
   % '  #  
 " # H%* + 37B6( C8 - 
 .
& ("#12/
& ' "/
& H, #/
& &>&"#/
& H,"#"" 0/
& (#/
& """" "/
& H"D#<0 5/
& &<0 7/
& H"#  #/
&  ##/
& H"/
& ( " 
*-#""  " 37B6=
& "##
 >#"",  "
:
>" # "
""#
0"#
%89;"$##
""984Y "4A5 17CAY2
5;9 1?B5Y24A:?9+1?CY2"
"?A;Y"747Y"
44?Y  ##-+
ABY4B;4Y" 4BB 
#54Y#4BB 9BB #
0%)B
 """"# ""##
   ""    =7 % 
 "   "##  (H1 2 
# & 
  #"##
#89;"
    # 9   "     
##9-<%
" " #
5H"&<0 """""
 """"
7<0 ""#""""
#&-" ""-" 3A6
"##     - A   "#
"##1
Pi
L
21
Pi
S
2 " 
-;"##(H# 
Pi
L=eVi
L
eVi
L+1
Pi
S=1Pi
L=1
eVi
L+1
Vi
L=
j=1
n
βjFij
-A

Fij
   1 " #2     
βj
 
 " 
" #  #  # 
"  #8)      
# #9##$ #
 #  #9 1"ZB42     "" 
#?
 # "   
1HHI2"" #9?1HH20
+=-1GJE"28GJE" #9#
  "" 3AC6+GJE"
#? #9
 #D  #   $ 
=    "   #9? 
"  "# E "
 "    "  1" Z BB92     # 9 1 
" 2" "  #? 1
" 2 " #? #
 " 
8"   3ACC56
#9:= ""##1"
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$
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W(*#8
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+[&7;9C?7
%05[BBC
(*W H  *" P H& +
$
4 H"  412?12 B78CB; BBB? ;7BY
? %4 44A&58B
 &45A; BB?9 &5;CBY
C &""  B12812 &B5AB8; BBB7 &9CBY
47 >  412912 B;;548 B 45CBY
47 >  412912 &B?99CA BBB4 &4;5BY
59 &"#  412912 &B8;998 BB;8 &447BY
5?  4[/B[ B94;54 BBCA 4B?BY
"# " #89;
"12.
2 #3?6<# 
#8##"
#2 " "#1 
"" 2>"#/
 ""
2 > #" "

2  """## 
" 1>2#9/
 &"""
"
2  "##" 
"##/
2 "    ""   "  
 #    #/
2     #   # #  12 #   " <  
"
"12:12 " ""#9?"A7Y
#" " #?
# " 
%" " Q 
#9142, "152
#$#  "<J"&0M"
#O3CB6"#  "#
"##     3C46 + $  ""  # 9   
 "9
( ""  $    "## 
"#"#
 " 3AC6=## $"##
#"# B4#"
"",  "###"#4&
  #=  "# #  "## 
1##2  ;?Y   4&
  1 #2F# "   
84Y"##% $#9"##
 ## ""##
" $ <,"
."""(#
"## 4Y
="## "  #9
 ?     "##        
+ "  
#"1#82#"" 
9 $#9 "3C96
  ,"    F  (      3AA6 
""" " %
        "  "
 ," MO" %
  1 # 82           
""  # 9 ""   #    
## ",F ," 
"K# ,"%
-"
% " "  ""     = 8-A
"##K"
""   ? (      # 9   "#  #  
"##+""
"###8BY ""=
# <   "      
$#9
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BB
B4
B5
B7
B8
B9
B?
B;
BA
BC
4B  

H"
H##
=8:( """"##
6. Discussion and Conclusion
 ""      "  "
""
#"")*+# "
  ,     #    ""   
  #    1  "#  &   
"2#""1
 (H  2 %   ""     #   
"\   "          &
     # 0 $,
##%#
? # "
     "     1 (H 2
"#"
 )*+ # "#    "  
     ,   "   &
     *$    #    
  & =<<LL#
3?;6( """, H%*+
   # "##   # %
"" ##   3C56)
 ,    "" &  
# %"#
,/    "    =  "" 
    &    "      
 "& ,3C7C86
( """ ##
3A6"> "
 "   #  #  
F,1
# 92 % # "  #" 
"    " # # 
 "#"/
($ #  &
""  
 ,"#"A7Y 
#89;#3A6
  ""##
(H          %
   "<  "@
89; % #
#$# "!
$ &"    $ #    
$ K" %  !%   
-$
      " "  "# " 
"(<" " 
-  # #"'
 " #      -
 "& """)
# $ F"
 &    #"#  
+-,""" "#
$I
References
346 E=.<L99415B4;27BB:7BB
.4B4B7AK849A?&B4;&B?B5B&?
356 J%%%+L&HHHE<%" 
," !!#H4A515B4C299:??
.4B4B4?KX%L*!EH%L5B4A4BBB8
376 ]X#" =
+59C15B4B2?A9:?C;.4B4B4?KX=@J@5BBCBCBB5
386 XE'E& H*EX'+%L
+<H++%+<+J)%" 
L%  HL%!%44815B4;289A5:
89CB.4B4B;7K"4?4;8?8448
396 )H(%E&.@"+H
= +)!#&=H=5B4;
3?6 %XH+JXE H'%#  >
  "1% 27C15B442C;:457.4B4BB;K4444?&B44&
C75B&?
3;6 =%HJ"+' E")&!#
(==15B4C2
3A6 X)DX' &"%#(X*
15B4;2.4B4B4?KX(X*5B4;4BB4?
3C6 X)DE'X@","E
#.( ""(X*5715B4;244C:
45;.4B4B4?KX(X*5B4;B9BB5
34B6 X+D+@ '&  .
N(X)=5415B452C49.4B4B;4K)=44B?4
3446 %XH"!
.#."E%+A85BB9
3456 X+*HEH$#&%
F#
(X*4415B49279:8?.4B4B4?KX(X*5B4844BBA
3476 X+D)F." # .E
JJ%=%J5B45J= 5B45.""9?:?C
3486 =J^(  .##
(X815B4824C:7;.4B58C9K%=&P8&L4&4C&7;
3496 X!%XHH"FH(* +
H%15B4;2.4B4444K45C74
34?6 '=J) %&E* * +'
"X"E4C?815BB?2544:54A.4B7484K4C?8&57
34;6 '=J) -* * +'"
X"E4AA515BB824C:5?.4B7484K4AA5&B7
34A6 '+&%!% &" <&# 
 #"HJ 5;15B4724BA:44?
.4B4B4?KXJ5B44B?BB9
34C6 %+P!H+&% " "# 
 #< "HJ 7515B47254:
7B.4B4B4?KXJ5B47B7BBC
35B6 P*,J) E)+%G*"J"
X"E574515B45249C:4?7.4B7484K5745&4;
3546 %E<+% %##XJE 
   " +H?B15B4?2488:49C
.4B4B4?KX(+H%5B494BBB5
3556 XJXHX+ L#!#:)(
H%7815BB525544:555C.4B4B?AK78594
3576 '&&=+)( " <
" +H?;15B4?29C:;7.4B4B4?KX(+H%5B4?B;BB4
3586 *XJH*G)#J"=>
 +.%" "(%""=15B4A24:5?.4B4BB;K4B?C8&
B4A&B;;4&?
3596 %P =""HX'X<< 
 #&""4B5
15B4A24;A:4C7.4B4B4?KXJ(5B4;B;B49
35?6 E)+ H!#&)(.#&
%)X!#H*47715BB;2;7:A4.4B4B?4K1%J2B;77&
C8AA15BB;2477.41;72
35;6 (++LH**"J*+HF
(X)=5815B492497:
4?4.4B4B;4K)=45547
35A6 X)D'X' X+J 5BBC%ME
O#."""(X)=5515B472
A84.4B4B;4K)=45B4B
35C6 X+D+@ X)D'F&"
 ;=#5BBCP1%2=X?415B4724;9:4A8
.4B4B4?KX=(%=5B47BCBB7
37B6 +)HJ  +J 5BB8
3746 XJ=%*#%+H%).&&
HNL'<4B15BBC2494:4?5.4B4B?4K1%J2495;&?CAA15BBC24B.814942
3756 +P*+X+'+I #
=+8415B4;2845:87B.4B4BB5K 57C4
3776 ++'+X+*""' 
E+=15B4924:5?.4B4BB;K4B?C8&B49&B9B4&5
3786 *H' E=&L(L4?755BBA
3796 +PE' "+H&"
L(J45&C;55B47
37?6 X* "#_.M"O>N14CA82D".KK#K@*N
[#775CA51+;5B4A2
37;6 *J=' E&(.*J12=' EX
)`4CAB
37A6 **J. #
=XC14CA9259;:5?9
37C6 XE,*JX* H"#"".
H%"EH"=4C;?.""7C:9B
38B6 *J(*XJHE !."
 .4CC5.""479:49B
3846 H,% ""XH4714CC7247;:48;
.4B4B4?KB5;5&8C881B92AB48?&U
3856 %=<F@*E%#,
 # A515B4?2.4B4B4?K05B494BB49
3876 *L%*+#"
I# +H??15B4?255?:585
.4B4B4?K0 "5B4?B7BB?
3886 XEE"= .X**L%12=H'#=H
7L=H%5BB5."7749&7784
3896 H+&E)" .%
" ""HJ 5;15B47259:89
.4B4B4?KXJ5B4544BB9
38?6 XH+&H=&=("%""
+L'<4815B472494:4?5.4B4B?4K1%J2L'495;&
?CC?BBBB4B9
38;6 )@JEJH"H,&( "
J L'<%7715B4724B8C:4B?9.4B4444K0497C&
?C585B45B4C85,
38A6 +%H= %""  
%H715B4B27:48.4B4B4?KXH@L5B4BB;BB7
38C6 *E'XJ +&++!"L].%*H
X'  +815BB;2.4B55B5K498;&;799474;
39B6 'LE)@"  "  JX
J8515B492A4:AA.4B447CK0&5B48&B4;;
3946 ++E+5.% "#   "
H%HH8515BBA248B:498.4B4B4?KX%5BB;B?B48
3956 EHH**#XP!"
 +(X)=5715B482879:888
.4B4B;4K)=47B9;
3976 X+J*HEDH&%
F&. 
(X)=5715B48244;?.4B4B;4K)=4754C
3986 H%*+5B47.D".KK,K4B?B5AKL((;C48
3996 **.@" *& H%
5BB4)J*!JE5B44
39?6 H' E*==8C15B4724B4:45B
.4B4BB;K4B?C8&B44&B589&?
39;6 *#!"X7?14CCC2949:957
.4B4B4?KB7?5&774C1CC2BBB54&U
39A6 +*H%*H""#
." "=815B4924
.4B44A?K8BB7A&B48&BBB9&<
39C6 *L% & ""&=
X;A15B492.4B4B4?K05B49B;BB4
3?B6 X#$.XX)+12H"H"
4C;;.""9?:?B
3?46 'J"$E(
5515BB72749:77A.4B4BABKB488C5CB74BBB49C59A;
3?56 )' %&;H5B44
3?76 **++"&#")J
45" #445BB4=X8815BBC28A;:8C?.4B4B4?K05BBA4BBB4
3?86 += +H%+++"&#
)J45" #445BB4.%=
X8?15B442848:858.4B4B4?K05B44B;BB4
3?96 H%*H%+%E!
+=15B472.4B4BB;K4B?C8&B47&B795&;
3??6 *E  
##47415B482??:4;8.4B4B4?K05B48B;BB;
3?;6 +*&+=# !
HE+5B4?
3?A6 *JDH#"".
 #JHE'<515BBB2487:499.4B4B4?K48?8&
5A?;1B42BBB48&?
3?C6 XJ)E+P)X+) '
.$"##J
HE'<515BBB2477:485.4B4B4?K48?8&5A?;1B42BBB47&8
3;B6 JJEJ>%,J"4;15BB82
8B4:85B.4B4BABK4B?49ABB94577475A;?A
3;46 &'+JH'&J)#'*+
"'(L'<4715B4525A7:5C?.4B4B?4K1%J2L'495;&
?CC?BBBBB;8
3;56 '=J)  . "#"
  .A?%+"
E5BB;
3;76 H+< L X#HE( 
:#.%""#"# =H4B15BBA2849:
857.4B4B4?KX=@H@5BBAB5BB5
3;86 X+E E.%J)) %+
'L'<715BB524B;:44;.4B4B?4K1%J2495;&
?CAA15BB527.714B;2
3;96  %E#&&L%J#C44
J " ) L'<4715B452?9:;7
.4B4B?4K1%J2L'495;&?CC?BBBBB9C
3;?6 X)DX' J #."&E%X
 +7915B4B2
3;;6 %=<F@% , ",#
"H%HHC515B4?2.4B4B4?K05B4?B?B4A
3;A6 %=<*F@*E%'E,J
 # !A515B4?2854:874
.4B4B4?K05B494BB49
3;C6 *E*F@%(#% # ,
 ?515B48284A:85?.4B4B4?K05B474BBB8
3AB6 '!'H+&E+!'&
'*+X"47;15B442784:78A
.4B4B?4K1%J24C87&987?BBBB557
3A46 )'*%'+@J.%H J #!H5B4B
3A56 *  J #"5BB7
3A76 HXJ+J] #.
)X%""=5415BB?27C:8A
3A86 %##X)D.H"# ,"
5BB7P#'<;15BB;25A7:5CB.4B4B4?K0<5BB;BABB4
3A96 (++LH**"J*+%&,"&#""
(X)=5915B4?27;A:7AC.4B4B;4K)=49B94
3A?6 X)DJ'"5BBCE#
P%9815B4?25B7:549.4B4444K4;89&9A;4454?5
3A;6 JL' #"
%X5?15B4B2775:785.4B4B4?KXX!!*5B4BB?BB4
3AA6 X+D+@ (J E.%(
J#5BBCPE=5B44
3AC6 *%'X+)'%""J%.%H J #!H
5BB9
3CB6 X*H.H0"#L95B15B492?45:?45
.4B4B7AK95B?45
3C46 )#'HJ'D%J FL'"
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... Evacuation is the most commonly used strategy to mitigate the impact of wildfires on human lives (McCaffrey et al., 2014;Yang et al., 2018). However, planning effective evacuations requires a clear understanding of human behaviors during these processes (Anyidoho et al., 2022;Forrister et al., 2024;Lovreglio et al., 2019). One key element to take into account when planning and making decisions about wildfire evacuations is the households' decision to evacuate or to stay (Folk et al., 2019). ...
... For instance, discrete choice modeling was used by Toledo et al. (2018) to investigate household decisions in a 2016 fire in Haifa, Israel. Many other studies have employed similar modeling techniques to predict householder decisions in Australia (Lovreglio et al., 2019;Strahan et al., 2019) and the U.S. McCaffrey et al., 2018;Wong et al., 2023). Alternative macroscopic approaches use multilinear regression models or geographically weighted regression to predict evacuation percentages among householders in different geographical groups based on GPS data (Sun et al., 2024a;Wu et al., 2022). ...
... This differs from the other two perceptions, which pertain to the level of response actions taken by householders and their perceptions of media influence (Lindell and Perry, 2003;Strahan et al., 2018). The relationship between threat perceptions and decision-making has been explored in numerous hazard studies (Lovreglio et al., 2019;Strahan and Gilbert, 2021). While it is widely acknowledged that threat perceptions and risk perceptions can impact decision-making, the relationship is complex and paradoxical due to the influence of other factors, such as previous hazard experiences and socioeconomic status (Wachinger et al., 2013). ...
... The decision-making process to evacuate or stay during a wildfire has been widely investigated in the literature using different qualitative and quantitative approaches, such as individual interviews, focus group interviews, questionnaires/surveys and GPS data inference (Kuligowski, 2021;Wu et al., 2022). These methodologies have been applied to study numerous wildfires around the globe, uncovering a range of factors that influence the decision-making process for homeowners' protective actions Lovreglio et al., 2019Lovreglio et al., , 2020Vaiciulyte et al., 2022). These contributing factors include both internal factors (e.g., demographics, perspectives, memories of previous experiences and attitudes) and external factors (e.g., disaster alerts and warnings as well as cues from the physical and social environment) (Lovreglio et al., 2019). ...
... These methodologies have been applied to study numerous wildfires around the globe, uncovering a range of factors that influence the decision-making process for homeowners' protective actions Lovreglio et al., 2019Lovreglio et al., , 2020Vaiciulyte et al., 2022). These contributing factors include both internal factors (e.g., demographics, perspectives, memories of previous experiences and attitudes) and external factors (e.g., disaster alerts and warnings as well as cues from the physical and social environment) (Lovreglio et al., 2019). Recent studies have synthesized these factors into conceptual models, particularly based on the Protective Action Decision Model framework (Lindell and Perry, 2012), to elucidate their impact on different phases of the decision-making process (Folk et al., 2019;Kuligowski et al., 2022;Lovreglio et al., 2019Lovreglio et al., , 2020. ...
... These contributing factors include both internal factors (e.g., demographics, perspectives, memories of previous experiences and attitudes) and external factors (e.g., disaster alerts and warnings as well as cues from the physical and social environment) (Lovreglio et al., 2019). Recent studies have synthesized these factors into conceptual models, particularly based on the Protective Action Decision Model framework (Lindell and Perry, 2012), to elucidate their impact on different phases of the decision-making process (Folk et al., 2019;Kuligowski et al., 2022;Lovreglio et al., 2019Lovreglio et al., , 2020. ...
... With the rising threat of wildfires, it is crucial for public agencies and communities to better understand evacuation behavior [7]. Effective wildfire evacuation management relies on capturing behavioral data, especially on roads, to estimate traffic conditions and prevent bottlenecks [8,9]. ...
... Traditionally, research in this field has relied on survey or interview data [3,10-12], which, while valuable, are often limited by memory bias and access constraints following large-scale evacuations [7]. Such limitations underscore the need for alternative methods of data collection to provide real-time, scalable insights into evacuation patterns. ...
... Moreover, once households decide on their evacuation logistics, they can then either depart immediately or continue evacuation preparations by "milling" (Wood et al., 2018) (e.g., seeking warning confirmation and additional information and relaying warnings to others) and engaging in logistical preparation (e.g., gather all persons who would evacuate with you; pack items you would need while gone; shut off utilities, secure the home and leave (Lindell et al., 2005)) before evacuating from their homes (Lindell and Perry, 2012;Lovreglio et al., 2020Lovreglio et al., , 2019. The time required to complete all of these steps -an evacuation time estimate (ETE) -is a function of four components (Urbanik et al., 1980;Lindell et al., 2019b): t T = f (t d , t w , t p , t e ), where t T is a household's total clearance time, t d is the authorities' warning issuance delay time, t w is the household's warning receipt time, t p is the household's evacuation preparation time, and t e is the household's evacuation travel timesee Figure 1, which is adapted from Lindell and Perry (1992) Figure 4.1. ...
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Despite the increase in frequency and intensity of wildfires around the world, little research has examined households' expectations of evacuation logistics and evacuation time estimate (ETE) components during such rapid-onset disasters. To address this gap, this study analyzes data from 152 household responses affected by the devastating 2018 wildfire in Mati, Greece where the second-deadliest wildfire of the 21st century took place. The questionnaire measured residents’ expectations of how they would respond to a future wildfire. This includes the number of vehicles they would take, their evacuation destination and route choices, and their expected evacuation preparation and travel times. Explanatory variables include risk perceptions, wildfire preparedness, wildfire experience, and demographic characteristics. The univariate results reveal some similarities to, but also some differences from, expected evacuation logistics and ETE components in other natural hazards. Moreover, correlation and regression analyses show that expected evacuation logistics and ETE components are primarily related to wildfire preparedness actions. Comparison of this study's results with other rapid onset events such as tsunamis and hazardous material incidents, as well as longer onset events such as hurricanes, sheds light on household responses to wildfires. Emergency managers can use the similarities in results across studies to better prepare for wildfire evacuations.
... • Householder decision-making in wildfires (Lovreglio et al. 2019 ...
Technical Report
A significant portion of Aotearoa New Zealand’s population is vulnerable to tsunami. To improve evacuation modelling and planning, this study explores the complexities of decision-making for tsunami evacuation. As an exploratory study, four expert elicitation workshops were held to brainstorm key factors influencing evacuation behaviour. Insights from the workshop reveal the complexity of decision-making, with multiple factors overlapping and potentially influencing each other. The factors identified can be broadly grouped into four categories. These include: (1) Individual factors: personal experiences, knowledge, health, mobility and other factors can shape evacuation choices. (2) Social context and influence: social norms, family dynamics and other influences can significantly impact evacuation decisions. (3) Information factors: Clarity, timeliness and comprehensiveness of information is crucial for effective evacuation. (4) External and location-based factors such as time of day, weather, familiarity with surroundings and damage to infrastructure can also influence evacuation strategies. These findings highlight the potential to integrate these factors to improve agent-based modelling to reflect actual decision-making processes. In turn, the models can improve evacuation planning and public education. The multi-faceted factors can be progressively integrated into tsunami evacuation modelling as research progresses. Models that integrate the decision-making factors identified in this study can be a valuable tool for enhancing tsunami planning for coastal communities in Aotearoa New Zealand.
... Most of the studies predicting wildfire evacuation behavior focus on understanding the factors that influence the binary evacuation decision of stay or go as well as wait and see decisions (Folk et al., 2019;Lovreglio et al., 2019;McCaffrey et al., 2018). To date, existing literature puts less emphasis on the perceptions that influence evacuation decisions and subsequent evacuee travel behaviors, including choices of departure timing (Kuligowski, 2021). ...
Article
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Climate change is increasing the threat of wildfires to populated areas, especially those within the wildland-urban interface (WUI). The 2021 Marshall fire forced the evacuation of over 30,000 people in Boulder, Jeffer-son and Adams Counties in Colorado, US. To improve our understanding of wildfire evacuation response, we surveyed individuals affected by the Marshall fire to analyze their evacuation decisions and resulting behavior. We used linear and logistic regression models to determine the factors influencing individuals' risk perceptions, their decisions to evacuate or stay, and the associated evacuation delay times. We found higher levels of risk perception at the time of the evacuation decision were associated with higher levels of pre-fire perceived risk, having mid-level household income, the receipt of fire cues and having a medical condition. Increased pre-event risk perception increased the likelihood of evacuating, along with gender (female-identified), being aged between 55 and 64 years, and having a higher household income. On the other hand, having a prior awareness of wildfires had a negative effect on evacuation likelihood. Additionally, having previous experience with fire damage, owning their home, having a larger household size and being alerted later in the fire event reduced the delay time; whereas engaging in preparation activities and having children in the home led to longer delay times. These research findings can be used by emergency managers to better prepare WUI communities for future wildfire events.
Technical Report
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The present work describes a novel framework for modelling wildfire urban evacuations. The framework is based on multi-physics simulations that can quantify the evacuation performance. The work argues that an integrated approached requires considering and integrating all three important components of WUI evacuation, namely: fire spread, pedestrian movement, and traffic movement. The report includes a systematic review of each model component, and the key features needed for the integration into a comprehensive toolkit.
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Wildfires across western North America have increased in number and size over the past three decades, and this trend will continue in response to further warming. As a consequence, the wildland–urban interface is projected to experience substantially higher risk of climate-driven fires in the coming decades. Although many plants, animals, and ecosystem services benefit from fire, it is unknown how ecosystems will respond to increased burning and warming. Policy and management have focused primarily on specified resilience approaches aimed at resistance to wildfire and restoration of areas burned by wildfire through fire suppression and fuels management. These strategies are inadequate to address a new era of western wildfires. In contrast, policies that promote adaptive resilience to wildfire, by which people and ecosystems adjust and reorganize in response to changing fire regimes to reduce future vulnerability, are needed. Key aspects of an adaptive resilience approach are (i) recognizing that fuels reduction cannot alter regional wildfire trends; (ii) targeting fuels reduction to increase adaptation by some ecosystems and residential communities to more frequent fire; (iii) actively managing more wild and prescribed fires with a range of severities; and (iv) incentivizing and planning residential development to withstand inevitable wildfire. These strategies represent a shift in policy and management from restoring ecosystems based on historical baselines to adapting to changing fire regimes and from unsustainable defense of the wildland– urban interface to developing fire-adapted communities. We propose an approach that accepts wildfire as an inevitable catalyst of change and that promotes adaptive responses by ecosystems and residential communities to more warming and wildfire. wildfire | resilience | forests | wildland–urban interface | policy
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With more frequent and destructive wildfires occurring in the growing wildland-urban interface (WUI), the ability to ensure the safe evacuation of potentially large groups of people is of increasing importance. This is a challenging task made only more difficult by the fact that there is often little warning and that evacuations often need to take place in a short period of time. The creation of credible and effective evacuation models is needed within the fire safety engineering community to help address this challenge. Although potentially difficult to represent, a critical component in developing such models is the consideration of what people will do in response to a WUI fire. In this literature review, research relating to WUI fire evacuations was collected to identify the factors that influence protective action decision-making and response during these events, specifically whether someone chooses to evacuate or not. To supplement the findings, related hurricane evacuation literature was also reviewed for such factors. The factors that were identified relate to sociodemographic factors, social and environmental cues, preparation and experience, familial responsibilities, location, and credible threat and risk assessment. These factors were organized according to the Protective Action Decision Model (PADM) to create a conceptual model of protective action decision-making. This is the first step in being able to incorporate such factors and their corresponding impact on public response into comprehensive WUI evacuation models.
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Risk management typologies and their resulting archetypes can structure the many social and biophysical drivers of community wildfire risk into a set number of strategies to build community resilience. Existing typologies omit key factors that determine the scale and mechanism by which exposure from large wildfires occur. These factors are particularly important for land managing agencies like the US Forest Service, which must weigh community wildfire exposure against other management priorities. We analyze community wildfire exposure from national forests by associating conditions that affect exposure in the areas where wildfires ignite to conditions where exposure likely occurs. Linking source and exposure areas defines the scale at which cross-boundary exposure from large wildfires occurs and the scale at which mitigation actions need to be planned. We find that the vast majority of wildfire exposure from national forests is concentrated among a fraction of communities that are geographically clustered in discrete pockets. Among these communities, exposure varies primarily based on development patterns and vegetation gradients and secondarily based on social and ecological management constraints. We describe five community exposure archetypes along with their associated risk mitigation strategies. Only some archetypes have conditions that support hazardous fuels programs. Others have conditions where managing community exposure through vegetation management is unlikely to suffice. These archetypes reflect the diversity of development patterns, vegetation types, associated fuels, and management constraints that exist in the western US and provide a framework to guide public investments that improve management of wildfire risk within threatened communities and on the public lands that transmit fires to them.
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Wildfire evacuation triggers refer to prominent geographic features used in wildfire evacuation practices, and when a fire crosses a feature, an evacuation warning is issued to the communities or firefighters in the path of the fire. The existing wildfire trigger modeling methods consider evacuation time as an input from a decision maker and employ fire spread modeling and GIS to create a trigger buffer around a threatened asset. This paper substantially improves on previous methods by coupling fire and traffic simulation models to set triggers, which allows us to estimate evacuation time using a traffic simulation model rather than relying on expert judgment. Specifically, we propose a three-step method within a spatiotemporal GIS framework to couple these models and to evaluate the value of the generated trigger buffers. The first step uses traffic simulation to estimate the total evacuation time for a threatened community. The second step derives the cumulative probabilities for distinct evacuation times from multiple simulations and generates corresponding probability-based trigger buffers. In the last step, we evaluate the value of the generated buffers by coupling fire and traffic simulation models to examine the spatial configurations of fire perimeters and evacuation traffic. A case study of Julian, California is used to test the proposed method. The results from two evacuation scenarios with different travel demand indicate that a larger trigger buffer (more lead time) will be needed for higher levels of evacuation travel demand. For example, the time required to guarantee that 95% of the evacuating residents arrive at the safe area as a fire approaches a community is estimated at 160 min for one scenario but 292 min if the travel demand is doubled. The resulting framework advances the dynamic representation of evacuation traffic in wildfires and improves our understanding of wildfire evacuation timing and decision making. The paper concludes with a discussion of the strengths and limitations of the proposed method, as well as future research directions.
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In social network group decision making (SNGDM), the consensus reaching process (CRP) is used to help decision makers with social relationships reach consensus. Many CRP studies have been conducted in SNGDM until now. This paper provides a review of CRPs in SNGDM, and as a result it classifies them into two paradigms: (i) the CRP paradigm based on trust relationships, and (ii) the CRP paradigm based on opinion evolution. Furthermore, identified research challenges are put forward to advance this area of research.
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Forest fires are an annual occurrence in many parts of the world forcing large-scale evacuation. The frequent and growing occurrence of these events makes it necessary to develop appropriate evacuation plans for areas that are susceptible to forest fires. The buildingEXODUS evacuation model has been extended to model large-scale urban evacuations by including the road network and open spaces (e.g. parks, green spaces and town squares) along with buildings. The evacuation simulation results have been coupled with the results of a forest fire spread model and applied to the Swinley forest fire which occurred in Berkshire, UK in May 2011. Four evacuation procedures differing in the routes taken by the pedestrians were evaluated providing key evacuation statistics such as time to reach the assembly location, the distance travelled, congestion experienced by the agents and the safety margins associated with using each evacuation route. A key finding of this work is the importance of formulating evacuation procedures that identifies the threatened population, provides timely evacuation notice, identifies appropriate routes that maintains a safe distance from the hazard front thereby maximising safety margins even at the cost of taking longer evacuation routes. Evacuation simulation offers a means of achieving these goals.
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Evacuation planning and management involves estimating the travel demand in the event that such action is required. This is usually done as a function of people's decision to evacuate, which we show is strongly linked to their risk awareness. We use an empirical data set, which shows tsunami evacuation behavior, to demonstrate that risk recognition is not synonymous with objective risk, but is instead determined by a combination of factors including risk education, information, and sociodemographics, and that it changes dynamically over time. Based on these findings, we formulate an ordered logit model to describe risk recognition combined with a latent class model to describe evacuation choices. Our proposed evacuation choice model along with a risk recognition class can evaluate quantitatively the influence of disaster mitigation measures, risk education, and risk information. The results obtained from the risk recognition model show that risk information has a greater impact in the sense that people recognize their high risk. The results of the evacuation choice model show that people who are unaware of their risk take a longer time to evacuate.
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Australian householders respond to bushfire in diverse and complex ways according to their circumstances and characteristics. They tend not to simply make a binary decision to evacuate from or remain at their property, or simply to ‘wait and see’ what happens before they decide. Seven self-evacuation archetypes displaying universally recognisable, fundamentally human characteristics were identified through cluster and discriminant function analysis of data from 457 householders who had recently experienced a bushfire. These seven archetypes characterise the diverse attitudes and behaviour of typical groupings of householders faced with making a protective decision during a bushfire. The archetypes comprise those who deny a threat exists (Threat Denier), who do not believe that they are responsible for themselves (Responsibility Denier) or are unable to take responsibility for their safe evacuation (Dependent Evacuator). They include those who are determined to safely evacuate (Considered Evacuator), those who look to advice and guidance from their community (Community Guided) and those who make considerable efforts to remain but are concerned they lack the experience to do so successfully (Worried Waverers). Some, who are experienced with bushfire, self-reliant and well prepared are committed to remaining (Experienced Independents) but in unfavourable circumstances may evacuate. Bushfire safety policy and programs should not treat these householders as simply stereotypical ‘evacuators’ or ‘remainers’ but accommodate the diversity of these archetypes to effectively meet their educational and engagement needs.
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More than half of those who died in the 2009 Black Saturday bushfires in Victoria, Australia, were sheltering inside a house at the time of their death. This marks a shift in bushfire fatality trends, which previously saw most fatalities occurring outside while residents attempted to protect assets or evacuate. This paper presents findings from research that examined people's experiences of sheltering in and exiting houses, sheds, personal shelters and other structures on Black Saturday. Qualitative data were sourced from 315 semi-structured interviews with residents affected by the bushfires and 50 witness statements presented to the Victorian Bushfires Royal Commission. Results indicate that despite limited planning and preparation specifically for sheltering on Black Saturday, many residents protected themselves from fire by sheltering inside houses, other structures and in open spaces. Most sheltered actively, engaging in regular monitoring and action to protect the shelter and occupants. However, some found sheltering challenging due to heat, smoke and responsibilities for children, vulnerable household members and the incapacitated. Misconceptions persist about the safety offered by houses and, in particular, bathrooms during bushfires. Education and advice should emphasise the need to plan and prepare for active sheltering, regardless of whether people intend to stay and defend or leave. The paper offers recommendations to promote planning and preparedness for active sheltering and identifies areas for further research.