Sangdan Kim's research while affiliated with Pukyong National University and other places

Publications (57)

Article
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Stochastic weather simulation models are used to generate data for hydrologic and agricultural applications. In recent years, stochastic downscaling has been employed in downscaling scenarios-based GCM or RCM output data, especially highly unpredictable hydrometeorological variables (e.g., precipitation). However, downscaling produces a number of t...
Article
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The frequency and magnitude of water-related disasters such as floods and landslides have intensified due to climate change, especially over East Asia, including the South Korea region. In this region, extreme precipitation events originate from multiple sources, such as tropical cyclones (i.e., typhoons) and frontal synoptic systems. Climate scena...
Article
For the correct design and application of LID facilities, non-point pollution reduction efficiency of the facility as well as installation and maintenance costs of the facility should be considered together. This study aims to find the optimal design plan for permeable pavement considering total projected costs and non-point pollution (TP) reductio...
Article
This study implemented a comparison of SPI characteristics in terms of quantitative and spatial analysis depending on four RCP scenarios. For this purpose, we compared quantitative characteristics of drought using standard precipitation index resulted from daily precipitation data reflecting future green gas concentration scenarios, and spatial dis...
Article
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This study is assessed social and economic vulnerability to natural disasters considering urban characteristics of Seoul. For this study, an indicator-based model, which is composed of 3 sub-indicators and 17 surrogate variables is applied. The 3 sub-indicators consist of demographic and social indicator, secondary damage caused indicator, and disa...
Article
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In this study, an urban landslide vulnerability assessment methodology is proposed with major focus on considering urban social and economic aspects. The proposed methodology was developed based on the landslide susceptibility maps that Korean Forest Service utilizes to identify landslide source areas. First, debris flows are propagated to urban ar...
Article
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In this study, an urban mud and debris flow disaster vulnerability assessment model based on landslide risk map being used by Korea forest service is proposed. In order to examine the vulnerability of urban areas, the assessment model is configured to reflect the exposure intensity, sensitivity level, and the ability to adapt to landslides. The pro...
Article
This study analyzed the construction and maintenance cost efficiency of Runoff reduction at LID element techniques to analyze the applicability of LID. Using the improved SWMM 5.1 ver analyzed the runoff reduction efficiency of LID element technology. Construction and maintenance costs, the analysis was carried out using the values presented in Was...
Article
In this study, the PMP is estimated by statistical methods using future climate change scenarios, AR5 RCP 2.6/4.5/6.0/8.5 future rainfall data, provided by Korea Meteorological Administration. Future PMP values have been estimated into two types. One is a moving average 1-day PMP(SMP) and the other is a cumulative average PMP(CMP). The trend of PMP...
Article
This study evaluated RCP scenario`s daily precipitation data from the regional climate model and proposed the calibration method of RCP data for hazard mitigation field. Three data, observed daily precipitation in 2001~2013, RCP scenario`s daily precipitation in same period with observed data, and RCP scenario`s daily precipitation in 2014~2100, wa...
Article
In this study, the 1-day probable maximum precipitation(PMP) is estimated by statistical methods. Frequency coefficients required for PMP estimation are corrected by taking the reciprocal of the scaling factor for 1-day to 24-hour after estimating frequency coefficients for 24-hour. PMPs are derived as two types, respectively; 1) PMP based on the m...
Article
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In this study, starting from a time-space nonstationary general random walk formulation, the pure advection and advection-dispersion forms of the fractional ensemble average governing equations of solute transport by time-space nonstationary stochastic flow fields were developed. In the case of the purely advective fractional ensemble average equat...
Article
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In this paper, the second in a series of two, the theory developed in the companion paper is applied to transport by stationary and nonstationary stochastic advective flow fields. A numerical solution method is presented for the resulting fractional ensemble average transport equation (fEATE), which describes the evolution of the ensemble average c...
Article
In this study an indicator-based model is proposed to quantify socio-economic damage under natural disaster. For the purpose of considering various aspects on socio-economic vulnerability under natural disaster, the proposed socio-economic vulnerability assessment model is composed of demographic/social indicator, economic indicator, and prepare/re...
Article
Water resources management requires policy enforcement in a changing environment. Climate change must be considered in major watershed river restorations in Korea. The aim of river restorations is to provide better water resource control - now and in the future. To aid in policy making in the government sector, "vulnerability-resilience indexes" (V...
Article
RCPs have been proposed in IPCC 5th report. Based on it, KMA has developed and provided future climate information to meet Korea. This study investigates whether KMA RCP 8.5 data can be appropriate in applying to analyze future extreme air temperature. For this purpose, first the reproducibility of past extreme air temperature is evaluated by compa...
Article
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The continuous increase in water demand is primarily caused by the explosive population growth rate due to urbanization and industrialization, and thus, is accelerated in both agricultural and residential parts. Drought adversely affects the quality of life and the whole economic situation of the country, and therefore, an accurate assessment of th...
Article
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Rainwater harvesting(RWH) system reliability model provides useful information on the RWH design since the model can generate the quantitative result, the reliability, of whether RWH system meets water utility amount of a certain region. The reliability is influenced by rainfall, water demand, and residence characteristics of the region, which can...
Article
Reduction loads of treatment BMPs can be calculated by using rainfall capture ratio which means the ratio between treated rainfall by BMPs and total annual rainfall in Korean TMDL. In this paper, Rainfall capture ratio and related terms was changed, and it is suggested the improved empirical formula of stormwater capture ratio which can consider th...
Article
Hydrological droughts are known as the occurrence of surface and subsurface water resources inadequacy, for a specific period of time, for water consumption. This study performed the development and the application of Real-time Drought Index (RDI) for the drought assessment of the Nakdong River Basin in Korea. The hydrologic drought index was analy...
Article
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First, precipitation is infiltrated into subsurface or is discharged through surface. Infiltration water is discharged into groundwater or is evaporated. This is called precipitation partitioning. This phenomenon can be quantified by the Horton index. This study analyzed effect of climate and watershed characteristics on precipitation partitioning...
Article
Distributed ecohydrological model which can simulate hydrological components, vegetation and landsurface temperature using practically available input and observed data with minimum parameters is introduced. This model is designed to properly simulate in area with lack of observed data. Parameter estimation and calibration of the model can be carri...
Article
Drought occurs more frequently in non-urban area where artificial water supply systems are not well equipped than in urban area where artificial water supply systems are well equipped, and occurs the first in such non-urban communities. In this study a drought index which can be applied to determine actual drought conditions on a daily basis at a r...
Article
This study models the effect of climate change on runoff in southeast Korea using the TANK conceptual rainfall-runoff model. The results are assessed using the indicators of hydrological alteration (IHA) developed by U.S. Nature Conservancy. Future climate time series are obtained by scaling historical series, provided by four global climate models...
Article
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The effect of climate and landscape characteristics on hydrologic partitioning and vegetation response is analyzed in this study. After quantifying hydrologic partitioning using the Horton index, the relation between regional climate characteristics and the Horton index is investigated. In addition, using the comparison between the predictability o...
Article
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This study suggests methods to improve the total maximum daily loads management system currently being regulated in Korea. The TANK model which is a conceptual rainfall-runoff model including the river routing function and the evapotranspiration process is adapted to simulate daily stream flows, and the 7-parameter log-linear model combined with th...
Article
In this study, probable maximum precipitation change was predicted using RCP 8.5 IPCC climate change scenario as extreme storm change. The modelling results based on average have the restriction on extreme rainfall value representation and future behavior prediction. To overcome these problems, this study uses air temperature change and precipitabl...
Article
The aim of study is to present how to estimate and use the FRI (Flood Risk Index) for classifying area zones based on regional flooding risk in terms of the integrated flood risk management. To estimate the FRI at a spatial resolution of city/county/town units for the Nakdong River Watershed, the 17 representative flood indexing factors are careful...
Article
In this study, drought Severity-affected Area-drought Duration (SAD) curves are analyzed in order to examine temporal and spatial behavior of drought. A copulas-based joint drought index which is studied recently is applied to express the severity of drought. JDIs across the country with 60 points are calculated monthly basis, and using EOF and Kri...
Article
In this paper a simple distributed hydrologic model is proposed to determine optimal installation location of LID devices and to quantify their non-point sources reduction efficiency in urban drainage catchment. The proposed model is applied to simulate surface runoff and non-point sources loading on urban drainage based on square cells. In the mod...
Article
This paper presents a design method by which the overflow risk related to a detention for managing nonpoint pollutant sources in urban areas can be evaluated. The overall overflow risk of a nonpoint pollutant sources control detention can be estimated by inherent overflow risk and operational overflow risk. For the purpose of calculating overflow r...
Article
Due to urban population growth and increase of impervious ratio, backwardness of major infrastructure, increased rainfall intensity in climate change, and so on, the risk of flood damage in urban areas is increasing. In order to establish measures for this, quantitative analysis for flood damage that occurs in urban areas is needed. In this study,...
Article
Full-text available
As extreme floods occur frequently in recent years due to global climate changes, an increase in sudden local flooding of great volume and short duration is becoming the significant danger and loss of life and property in the Korean Peninsula as well as most parts of the world. Since such a local flood rises quite quickly with little or no advance...
Article
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This study proposed a practical approach to estimate design rainfalls that can be applied to design reference year using the relationships among distribution parameters, annual rainfalls estimated from GCMs(Global Circulation Models), and annual maximum rainfalls observed at gauging stations, leading to consider climate change. The highlight of thi...
Article
The Common Land Model (CLM), the land component of the Community Climate System Model (CCSM), for simulating water and energy exchanges between land and atmosphere has water and energy biases resulting from deficiencies in some parameterizations related to hydrological processes. This paper presents the implementation of modified parameterizations...
Article
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In this study, the effect of climate change on drought occurrence is modeled using a conceptual soil water model and results from the model are analyzed. Future climatic data are prepared by applying climate information drawn by four global climate models in accordance with greenhouse gas emission scenarios A2, A1B and B2 to the spatio-temporal cha...
Conference Paper
Vulnerability assessment plays an important role in drawing up climate change adaptation plans. Although there are some studies on broad vulnerability assessment in Korea, there have been very few studies to develop and apply locally focused and specific sector-oriented climate change vulnerability indicators. Especially, there has seldom been any...
Article
In this study a hybrid design scheme for the purpose of designing infiltration-based retentions and a detention is applied to reproduce urban hydrologic regime to natural hydrologic regime. The proposed method is based on the NRCS-CN stormwater estimation technique, and applied to determine the size for stormwater control facilities on the Oncheon...
Article
In this study a conceptual soil water model is proposed to simulate water balance at catchment scale. The model is based on the sequential separation of daily precipitation into surface runoff, wetting, vaporization, and percolation. The proposed model is calibrated by using three observation sets: empirically estimated annual vaporization, monthly...
Article
In this study, a dynamic modelling scheme is presented to derive the probabilistic structure of soil water and plant water stress when subject to stochastic precipitation conditions. The newly developed model has the form of the Fokker–Planck equation, and its applicability as a model for the probabilistic evolution of soil water and plant water st...
Article
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For the assessment of climate change impacts for the Byeongseong stream, CSIRO-Mk3.0 is selected as future climate information. The projections come from CSIRO Mark 3.0 used to simulate the green house gases emission scenario known as A2. Air temperature and precipitation information from the global climate model simulations are converted to region...
Article
The aim of this article was to study the effects of land use change and water reuse options on an urban water cycle. A water cycle analysis was performed on the Goonja drainage basin, located in metropolitan Seoul, using the Aquacycle model. The chronological effects of urbanization were first assessed for the land uses of the Goonja drainage basin...
Conference Paper
Most of the related literatures of designing storage-based LID facilities assume that precipitation event-depths follow the 1-parameter exponential probability density function in order to reduce the mathematical complexity of the derivation process. However, how to express the precipitation is the most important factor for analyzing stormwater, an...
Article
Most related literature regarding designing urban non-point-source management systems assumes that precipitation event-depths follow the 1-parameter exponential probability density function to reduce the mathematical complexity of the derivation process. However, the method of expressing the rainfall is the most important factor for analyzing storm...
Article
In this study, the variability of the Horton index which is ratio of vaporization and wetting water is investigated using a conceptual soil water balance model. From the proposed model, the steady-state soil water probabilistic density function is derived through meteorological and watershed characteristics and then the sensitivity of Horton index...
Article
This study presents the export of constituent transport loads through a river system. The proposed constituent transport load estimating procedure can be operated with the on-going Korean TMDL monitoring system. This study firstly discusses the use of a hydrologic simulation model (TANK) to estimate stream-flow for the 40 sub-catchments. Model para...
Article
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A stochastic point rainfall model which can represent the inter-relation between rain-cell intensity and duration is used to investigate the possibility of temporal downscale for hourly rainfall time series. The long-term simulation result appears to regenerate the observed data well in terms of statistics, but, there are still problems such as the...
Article
In this study, the depth–area–duration (DAD) analysis for characterizing an extreme precipitation event provides a basis for analysing drought events when storm depth is replaced by an appropriate measure of drought severity. Monthly precipitation is probabilistically transformed into standardized precipitation index (SPI) and SPI time series are d...
Article
Since the river is inevitable for living, the importance of the management of water quality cannot be overemphasized. Therefore, reliable monitoring programs which reflect the spatial and temporal variations have to be set, but usually the water quality data are composed of vast amount of data matrix. Multivariate statistical techniques including f...
Article
A new stochastic model for the propagation analysis of fluctuations in rainfall to soil water dynamics is proposed with major focus on its probabilistic structure. This model is derived by using cumulant expansion theory from a stochastic differential equation with stochastic rainfall forcing, and has the advantage of providing the probabilistic so...
Article
This paper studies the statistics of the soil moisture condition and its monthly variation for the purpose of evaluating drought vulnerability. A zero-dimensional soil moisture dynamics model with the rainfall forcing by the rectangular pulses Poisson process model are used to simulate the soil moisture time series for three sites in Korea: Seoul,...
Article
A new stochastic model for one-dimensional evaporated soil water flow is proposed with major focus on its probabilistic structure. The newly developed model has the form of the Fokker-Planck equation, and its validity as a model for the probabilistic evolution of the nonlinear stochastic unsaturated flow process is investigated under a stochastic s...
Article
Full-text available
Unsaturated flow with heterogeneous soil surfaces in the field scale is an outstanding issue in hydrologic modeling. The objective of this study is to develop and solve the upscaling conservation equation, which has the form of the Fokker-Planck equation. In this study, the impact of areal heterogeneity of soil hydraulic parameter on soil ensemble...
Article
This study investigated the characteristics of spatial and temporal variability of soil moisture field by means of the empirical orthogonal functions (EOFs). The relative roles of various affecting factors (topography, soil properties, vegetation, etc.) to the spatial variability of soil moisture contents have also been evaluated. Two soil moisture...

Citations

... Before proceeding with the analysis, the simulated precipitation data from all the GCMs and scenarios are extracted for the specified latitude and longitude values of all the stations applying the inverse distance weighting interpolation method. The simulated precipitation data are then corrected for bias against the observed daily data using a mixed distribution-based Quantile Mapping (QM) technique (Shin et al., 2019) that uses both Gamma and Gumbel distributions to correct the bias in mean and extreme precipitation (values above the 95th percentile) for all stations considering each scenario. Next, the Annual Maximum Series (AMS) of precipitation intensity is extracted over moving windows of 1, 3, 6, 12, and 24 hours from the observed hourly data for each station. ...
... In this study, it was judged that there would be a difference in the optimal daily probability density function for each point, and Kernel Density Estimation (KDE), a nonparametric probability density function, was selected. The SFI for each multiple-purpose dam was calculated by estimating the probability of individual variables of the selected probability distribution type and applying it to the standard normal distribution [23]. It was calculated by using dam inflows and the maintenance period of the drought stage considering the hydrological factors of the watershed [22]. ...
... Studying these events is critical for implementing sustainable water management policies and mitigating negative impacts. Understanding past extreme events is also important for estimating likely future patterns, because of close correlations (Knox and Kundzewicz, 1997;Scaife et al., 2008;Bovolo et al., 2012;Smith and Lawson, 2012;Phipps et al., 2013;Lee et al., 2016). ...
... 따라서 투수성 포장을 설치할 수 있는 장소를 주차장으로 제한하였으며, 설치 가능 소유역 과 주차장 면적을 각각 Fig. 2(음영 처리된 소유역)와 Table 3과 같다. 본 연구에서는 모형 매개변수 추정을 위한 EPA-SWMM 과 Matlab 연동 모듈을 구성하여( Choe et al., 2015;Park et al., 2016;Lee et al., 2018 3.2 다수의 투수성 포장 설치를 위한 다목적 최적화 2.3절에서 산정한 설계 강우사상을 이용하여 투수성 포장 설치 최적설계안을 도출하고자 하였다. 이 때, EPA-SWMM 과 MATLAB을 연동하여 최적설계안이 도출될 때까지 자동 적으로 모의할 수 있도록 모듈을 구성하였다. ...
... The application of the RCP4.5 can provide a common platform for climate models to explore the climate system response to stabilizing the anthropogenic components of radiative forcing [20]. RCP4.5 is a mitigation scenario that was assumed a general scenario for South Korea considering the response to climate change through regulation [21]. ...
... On the one hand, the novelty of our approach is that we consider the assessment of the vulnerability to landslide and not only the susceptibility. Nowadays, many works focus only on the susceptibility assessment (made by classical statistics or by machine learning and deep learning methods) (see for instance: [12,37,[72][73][74]). On the other hand, we consider the ecological values and not only the socio-economic, which is more frequent to see in the existing literature (see for instance: [65,75]). The assessment of the ecological values within vulnerability evaluation is important, because they are related to socio-economic values. ...
... 자연재해에 대한 취약성분석은 홍수(T.H. Hong et al., 2015;Lee and Choi, 2016;Lim and Park, 2016)에 대한 연구가 대부분을 차지하며, 수자원 (Won et al., 2014), 대설( Kwon et al., 2016), 도시재해 (Kim and Choi, 2014), 지하수위 관리( Yang et al., 2017), 사회경제적 재해 ( Park et al., 2016) 등 다양한 분야에 대하여 연구되었다. ...
... Geological conditions, social behavior, structural design and economical condition are major driving factors affecting the earthquake vulnerability assessment (EVA) [8][9][10][11][12]. Towards estimating the seismic vulnerability of a specific area, several researchers have applied Analytic Hierarchy Process (AHP) and Analytic Network Process (ANP) methods combining geographical information system (GIS) and multi criteria decision-making (MCDM) approach [11][12][13][14][15][16]. ...
... ), 통계학적 방법을 이용하 여 미래의 1일 가능최대강수량을 전망한 연구결과(Sim et al., 2015의 PMPs 추정값과 비교 분석이 수행된다. 본 연구에서는 RCP 8.5 시나리오를 사용하였으며, 이는 현재에 비해 가장 급격한 기후변화를 가정하였을 때 발생할 수 있는 시나리오이다. ...
... Table 3 shows the input values of the parameters for each element technology used in the SWMM-LID simulation. For the range of values of the input layer, the major literature and LID application cases were referenced [39][40][41]. Table 4 depicts the scenarios that were considered for evaluating the effect of the runoff reduction strategies. This was set as the basis for the application of a 3% impermeable area reduction considering the target reduction rate (40.3%→37.6%) of the small area of 25% or more in the third comprehensive non-point source pollutants management plan [42]. ...