Richard Andrášik

Richard Andrášik
Transport Research Centre | CDV · Department of Geoinformatics

PhD in Mathematics

About

76
Publications
16,073
Reads
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698
Citations
Introduction
My research is motivated by helping people to understand the nature and the world around us. I am a scientific researcher and applied statistician. The topic of my PhD thesis was "Mathematical and physical models of fluid dynamics". I am interested in new ways of modelling fluid dynamics, especially those inspired by nature. Furthermore, my interests lie in areas of Bayesian statistics, numerical methods, inverse problems and nonlinear optimization.
Additional affiliations
September 2018 - present
Palacký University Olomouc
Position
  • Researcher
September 2011 - present
Transport Research Centre
Position
  • Researcher
Education
September 2016 - August 2017
Palacký University Olomouc
Field of study
  • Applied mathematics
April 2015 - May 2015
Swedish University of Agricultural Sciences
Field of study
  • Spatial analysis of traffic crashes
January 2014 - March 2014
Lappeenranta – Lahti University of Technology LUT
Field of study
  • Numerical mathematics

Publications

Publications (76)
Article
Full-text available
In the past, fires around railways were often associated with steam locomotives. Although steam locomotives have disappeared from everyday rail traffic, fires still occur. A vegetation fire near Bzenec (Czech Republic) on 21 June 2018 affected, for example, 124,110 m2 of forest and grassland. The investigation revealed that the fire was caused by a...
Article
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Millions of wild animals are killed annually on roads worldwide. During spring 2020, the volume of road traffic was reduced globally as a consequence of the COVID-19 pandemic. We gathered data on wildlife-vehicle collisions (WVC) from Czechia, Estonia, Finland, Hungary, Israel, Norway, Slovenia, Spain, Sweden, and for Scotland and England within th...
Article
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Many approaches have been developed in order to mitigate wildlife-vehicle collisions (WVC), their causes and consequences. Reliable data on the amount and location of killed animals along roads are therefore necessary. The existing WVC databases are usually, however, far from complete. This data underreporting causes problems when identifying the r...
Article
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Ungulate–vehicle collisions pose a traffic safety issue as well as wildlife-conservation issues in many countries. While fences are recommended as reliable safety measures for motorways and other high-traffic volume roads, no generally accepted measures of the same efficiency are available for secondary roads. Odour repellents are applied in many c...
Article
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We analyzed data from traffic counters installed on 143 Czech roads (motorways and primary roads) which precisely indicated current traffic volume during occurrences of ungulate-vehicle collisions (UVC). One thousand nine hundred ninety-five UVCs were identified over the period 2009–2015 on these 143 road segments. The overall range of annual avera...
Article
Roads represent a threat to biodiversity, primarily through increased mortality from collisions with vehicles. Although estimating roadkill rates is an important first step, how roads affect long‐term population persistence must also be assessed. We developed a trait‐based model to predict roadkill rates for terrestrial bird and mammalian species i...
Article
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Knowledge about the cause of differential structural damages following the occurrence of hazardous hydro-meteorological events can inform more effective risk management and spatial planning solutions. While studies have been previously conducted to describe relationships between physical vulnerability and features about building properties, the imm...
Article
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The aim of this study was to identify landscape-related factors which could explain the concentration of traffic crashes with large ungulates in a forest environment. We worked with un-gulate-vehicle collisions which took place on the Czech road network in the period 2014-2016 using the application Srazenazver.cz. With the KDE+ method, we chose the...
Article
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A number of traffic crash databases at present contain the precise positions and dates of these events. This feature allows for detailed spatiotemporal analysis of traffic crash patterns. We applied a clustering method for identification of traffic crash hotspots to the rural parts of primary roads in the Czech road network (3,933 km) where 55,296...
Technical Report
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Report prepared for the objectives of the EnVeROS Intellectual Output 1 (IO1): WVC framework analysis/ Needs assessment report.
Article
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Wildlife-vehicle collisions (WVCs) pose a serious global issue. Factors influencing the occurrence of WVC along roads can be divided in general into two groups: spatially random and non-random. The latter group consists of local factors which act at specific places, whereas the former group consists of globally acting factors. We analyzed 27,142 WV...
Article
Full-text available
Concerning three-dimensional models, an analytical solution is often impossible and numerical solution can be unduly complicated. Thus, we need to simplify three-dimensional models, when possible, prior to solving the problem. Recently, several lower-dimensional models for dynamics of compressible fluids were rigorously derived from three-dimension...
Article
Full-text available
We conducted spatial analyses of traffic crashes, which took place in Czechia over 2010-2016, with respect to the road geometry data. The aim of the work was to identify hazardous road sub-segments where higher than expected numbers of traffic crashes occur. The entire Czech road network (58,200 km) was segmented at intersections into 39,074 betwee...
Article
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We present the ROCA (ROad Curvature Analyst) software, in the form of an ESRI ArcGIS Toolbox, intended for vector line data processing. The software segments road network data into tangents and horizontal curves. Horizontal curve radii and azimuth of tangents are then automatically computed. Simultaneously, additional frequently used road section c...
Article
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This paper is the first dealing with animal-vehicle collisions (AVC) with red and roe deer in South Tyrol, Northern Italy. The Autonomous Province of Bolzano (South Tyrol) has been collecting AVC data since 2012 on the entire provincial road network. Each year, AVC data accounted for more than 700 cases per year, with several socioeconomic and ecol...
Article
Full-text available
Effective measures reducing risk of animal‐vehicle collisions (AVC) require defining high‐risk locations on roads where AVCs occur. Previous studies examined factors explaining locations of individual AVCs; however, some AVCs can form hotspots (i.e., clusters of AVCs) that can be explained by local factors. We therefore applied a novel kernel densi...
Article
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Problems with three-dimensional models lie very often in their large complexity leading to impossibility to find an analytical solution. Numerical solutions are sometimes an option, but they can be unduly complicated in the case of three-dimensional models. Frequently, researchers investigate models where one or even two dimensions are almost negli...
Poster
Full-text available
We analyzed a database of railway traffic failures which were caused by storms on the Czech railway network between 2010 and 2017. More than 6,000 railway traffic interruptions caused by storms have been recorded. This database, administered by the national railway administrator, does not contain direct losses related to the interruptions. Informat...
Article
Full-text available
Autopsy reports of 119 cyclists who died in two Czech regions between 1995 and 2013 as a result of traffic crashes were studied. In all the study cases, pathologists analyzed whether a helmet could have helped the cyclists survive the crash or not. The crash circumstances from the police reports were then evaluated. The results indicate that helmet...
Article
Wildlife-vehicle collisions (WVC) amount to 11% of all registered traffic crashes in the Czech Republic causing, apart from numerous deaths and serious injuries to animals, property damage and injuries to car passengers. Odor repellents have the potential to lower the overall number of WVC and allow animals to cross roads at the same time. We teste...
Article
Objective: Alcohol abuse is related to a wide variety of negative health outcomes including mortality in older people. Alcohol abuse in older people is characterised by certain specific features uncommon in general adult population. The main objective of this study was to analyse the autopsy protocols of deceased older people in relation to blood...
Article
Full-text available
Disruptions of railway traffic have many reasons. Tree falls onto railway tracks or overhead lines rank among the most common causes of disruptions of a natural origin. 2039 tree-fall events, containing up to 70 individual trees per event, were registered on the Czech railway network between 2012 and 2015. 32% of them were directly caused by 14 wea...
Article
We present a system for state-wide evidence of animal-vehicle collisions (AVC). The primary part of this system is a geographic database which is connected to a web-map application. AVC data come from the Police via an online system of traffic incidents (JSDI) and from volunteers through a web or mobile interface. Data are processed using automatic...
Conference Paper
The landslide risk for the entire Czech road network is presented here. The risk was computed using data on landslide hazard and data on potential impacts of road blockage. Data from the official landslide database were used for landslide hazard computation combined with data from historical records on roads interrupted by landsliding. Vulnerabilit...
Poster
Full-text available
Animal-vehicle collisions (AVC) on roads which cause damage to vehicles are registered in an official crash database maintained by the Police in the Czech Republic. We have recently launched an AVC report application www.srazenazver.cz (roadkills in Czech) to provide a map overview of this and additional roadkill on Czech roads. This application is...
Poster
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We present an overview and two case studies of natural hazard impacts on rail transportation systems in the Czech Republic. Flooding, landsliding, heavy snowfall, windstorms and glaze (black ice) are the most common natural processes which occur in this region. Whereas flooding and landsliding usually cause direct damage to the transportation infra...
Conference Paper
Full-text available
Improving the road network according to principles of self-explaining roads is a promising way to increase the level of safety; however, there are no universal guidelines on how to measure and improve the self-explaining performance of the existing roads. In order to apply this approach on Czech national roads, the presented study was conducted, co...
Poster
Full-text available
Improving the road network according to principles of self-explaining roads is a promising way to increase the level of safety; however, there are no universal guidelines on how to measure and improve the self-explaining performance of the existing roads. In order to apply this approach on Czech national roads, the presented study was conducted, co...
Article
Improving the road network according to the principles of self-explaining roads is a promising way to increase the level of safety; however, there are no universal guidelines on how to measure and improve the self-explaining performance of existing roads. To apply this approach on Czech national roads, the present study was conducted, consisting of...
Research
Full-text available
KDE+ clusters of animal-vehicle collisions from 2013 to 2015 were computed on the Czech road network. We focused on clusters close to intersections of the green and transport infrastructure (104 clusters) and the six most important clusters from each region (78). Other clusters (95) which had the collective risk above 2 were also visualized.
Poster
Full-text available
Vibrations of bicycles negatively influence riding comfort. Uneven surface pavement is the principal source of vibrations. We have developed a simple and effective method for objective bicycle vibration measurement using GPS and accelerometer devices mounted on a bicycle. The advantage of this approach is its simplicity and transferability because...
Poster
Full-text available
The Czech railway network ranks among the densest in the entire world (entire length is 9,487 km). The majority of railways were built before 1918, however. Only few of them, which form a backbone of the network, were as of 1989 modernized to allow for the fast train connections. Numbers of local tracks, particularly in rural areas and connecting s...
Poster
Full-text available
A generally low cycling helmet use is observed in the Czech Republic. Originally, it was not ob-ligatory to wear a cycling helmet. The first change of a law, when cyclists under 15 had to wear helmets, was enacted in 2001. Five years later (2006) the threshold of compulsory helmet wearing was moved to 18 years. No complex research of portion of hel...
Conference Paper
Full-text available
Reliable identification of hotspots (clusters) of traffic accidents is a safety issue which has to be addressed. Numerous methods have been used to identify dangerous locations. One of the most promising seems to be the KDE+ method which overcomes the well-known drawbacks of the existing approaches. The KDE+ method is able to objectively determine...
Conference Paper
Full-text available
Estimating collective and individual risks is a frequently used approach in the process of assessment of technological systems or proposed constructions. The principal reason for these calculations is to allow the decision-makers to evaluate, whether a planned construction increases the limiting risk above a pre-defined threshold or not. We analyze...
Conference Paper
Full-text available
We focused on fairly rare situations involving replacement of a transformer. This routine process can be significantly affected by the current situation on a train and road network. We draw attention to the road network due to its more complicated structure. We identify which main parameters of the network concerning the transportation of the trans...
Poster
Full-text available
We present a comparison of animal-vehicle collision patterns which we have computed for selected roads in several countries (e. g. Poland, Finland, France, Hungary, Italy, Slovakia, Spain, Sweden and the USA). We used the KDE+ method for objective identification of dangerous locations (hotspots, clusters).
Article
Full-text available
A new method for the automatic identification of road geometry from digital vector data is presented. The method is capable of efficiently identifying circular curves with their radii and tangents (straight sections). The average error of identification ranged from 0.01 to 1.30 % for precisely drawn data and 4.81 % in the case of actual road data w...
Poster
Full-text available
Abundant research on landsliding exists at the present time. We focused on a somewhat omitted part of landslide research – landslide phases – events during which an increased number of individual landslides have been concurrently activated (Špůrek, 1967; Bíl et al., 2014). Landslide phases are important because their occurrence indicates the presen...
Poster
Full-text available
We present a web-map application (www.rupok.cz) designed for visualization of losses caused by natural hazards to the transportation infrastructure. This application is an output of a project in which we analyzed direct, indirect and network-wide impacts of major natural disasters which hit the CZ as of 1997. When natural disasters hit a road netwo...
Research
Full-text available
The main data source relating to traffic interruptions on railways was obtained from emergency reports including unplanned breakdowns, accidents and cases of natural hazards, which are published by the main national carrier (České dráhy) on its webpages, or accessible via RSS channels, e-mails or tweets. Such a database was supplemented with histor...
Research
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The map describes data on closed roads and highways due to natural processes. The data are related to individual sections and depicted with circular diagrams. Its size depends on the number of years when the section was interrupted. It also displays the concrete events during which the section was interrupted. Additional information in this map is...
Poster
Full-text available
Identification of risk locations within road network is the primary task of its safety management. In this regards traffic accidents have been used as a traditional indicator; however it has also been known that accidents provide retrospective view only, their occurrence is random and their collection is time consuming. On the other hand, various a...
Conference Paper
Full-text available
Identification of risk locations within road network is the primary task of its safety management. In this regards traffic accidents have been used as a traditional indicator; however it has also been known that accidents provide retrospective view only, their occurrence is random and their collection is time consuming. On the other hand, various a...
Article
Objectives: The circumstances and causes of death of 129 cyclists registered in the Olomouc and the Zlín regions, the Czech Republic, between 2005 and 2013 were the subject of this study. Methods: We analyzed the autopsy reports, where the principal cause of death was stated, and obtained a detailed description of the circumstances recorded by t...
Conference Paper
Full-text available
We summarize our yearlong experience with the animal-vehicle collision (AVC) report application www.srazenazver.cz. This tool was launched to cover as much as possible AVC sources into one place. This application is accessible through the common web browsers and allows the user to input, edit and browse data gathered by other users. The data is vis...
Conference Paper
A functioning road network is a vital part of society. The network consists of road sec- tions and intersections which are usually modeled as a graph composed of nodes and links. The most important property of the network from the point of view of its users is its robustness, which means its ability to endure diverse types of catastrophic events...
Conference Paper
Full-text available
Two primary types of traffic accident causes can be identified. The first cause is connected to local conditions of the road infrastructure. The second cause is global and includes factors such as driver behaviour, vehicle state and weather conditions. While the global causes can increase the probability of traffic accident occurrences anywhere...
Article
Full-text available
Context Objective identification of locations on transportation networks, where animal-vehicle collisions (AVC) occur more frequently than expected (hotspots), is an important step for the effective application of mitigation measures. Objectives We introduce the KDE+ software which is a programmed version of the KDE+ method for effective identifica...
Research
The initial value problem for arbitrary order linear ordinary differential equations with constant coefficients is considered. The right-hand side of the equation and the initial conditions are affected by noise. In addition, the values of the right-hand side are given only on a sparse set of discrete points. This type of problem arises in applicat...
Book
Full-text available
Silniční infrastruktura patří mezi nejdůležitější objekty, které lidstvo vytvořilo. Bez ní by nebylo možné přepravovat různé druhy zboží včetně základních potravin a poskytovat základní služby, jako jsou třeba služby zdravotní. Na silniční infrastruktuře tedy stojí celá ekonomika lidské společnosti a bez ní bychom určitě nebyli jako lidstvo tam, kd...
Article
Abstract Cycling comfort consists of several factors. Their relevant values are important in the process of bicycle facility planning. Poor surface pavement quality manifests itself in terms of vibrations of a bicycle. This strongly influences the perception of a cycle track, general cycling comfort and the route choice as well. We introduce dynami...
Article
Full-text available
Shallow landslides are fairly frequent natural processes which emerge as a result of both rainfall and rapid snowmelt in the Flysch Belt of the Outer Western Carpathians. We estimated the total water content thresholds for the previously defined seven phases of increased landsliding which took place between 1939 and 2010 around the Napajedla meteor...
Article
Full-text available
Srážky s velkými savci způsobují škody na vozidle a často i zranění posádky. V rámci České republiky jsme s využitím statistického modelu identifikovali místa, kde opakovaně k těmto kolizím dochází. Hlavním cílem studie však bylo vyhodnotit mortalitu drobných obratlovců na těchto úsecích, která není nikde evidována. Zjistili jsme, že úmrtnost drobn...
Article
Full-text available
Srážky s velkými savci způsobují škody na vozidle a často i zranění posádky. V rámci České republiky jsme s využitím statistického modelu identifikovali místa, kde opakovaně k těmto kolizím dochází. Hlavním cílem studie však bylo vyhodnotit mortalitu drobných obratlovců na těchto úsecích, která není nikde evidována. Zjistili jsme, že úmrtnost drobn...
Data
Shluky dopravních nehod na silniční a dálniční síti České republiky za období 2009 – 2013 / Clusters of traffic accidents on the road and motorway network in the Czech Republic over the period 2009 – 2013
Conference Paper
Full-text available
We studied in detail the circumstances and causes of death of 129 cyclists which occurred in the Olomouc and the Zlín region, the Czech Republic, between 2005 and 2013. We analysed the autopsy reports where the principal cause of death was stated. We obtained a detailed description of the circumstances recorded by police officers for the same group...
Article
Full-text available
Disruption of segments of roads can have a significant impact on the vulnerability of the entire network. Natural disasters are frequent causes of disruptions of this kind. This article focuses on determining the risk of road disruptions due to landslides. Our approach is based on methodology widely used in the field of epidemiology. We had availab...
Conference Paper
Full-text available
An analysis of traffic accidents caused by animals (animal-vehicle collisions, AVC) on Czech roads was performed using the new two-stepped KDE+ method, which is a statistical approach based on kernel density estimation (KDE) followed by Monte Carlo simulations. This approach is capable of determining whether the accidents on a road section are dist...
Conference Paper
Full-text available
Animal Vehicle Collisions (AVC) often show a pattern of aggregation, with clusters along conflictive road stretches. Road traffic safety is diminished in these hotspots, due to the risk of accidents involving animals. Therefore, the iden-tification of these stretches is essential to apply effective mitigation measures. Data from 2,110 accidents inv...