Sangdan Kim
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View article: Data Assimilation for a Simple Hydrological Partitioning Model Using Machine Learning
Data Assimilation for a Simple Hydrological Partitioning Model Using Machine Learning Open
Predicting streamflow is a core element of efficient water resource management. Traditional hydrological models are constructed based on historical observational data, leading to cumulative prediction errors over time. To address this issu…
View article: Eco-hydrologic model for assessing the climate and hydrologic elasticity of vegetation in mountain wetlands
Eco-hydrologic model for assessing the climate and hydrologic elasticity of vegetation in mountain wetlands Open
Climate sensitive mountain wetlands are complex eco-hydrologic interactions that make their future behavior difficult to predict, and the lack of long-term systematic observations compounds this difficulty. To overcome these limitations, t…
View article: Development of reservoir operation rules for environmental water supply
Development of reservoir operation rules for environmental water supply Open
One of the most common methods for operating reservoir systems is to follow pre-established rules that specify allowable release volumes at specific times of the year. In South Korea, traditional reservoir operation rules have primarily fo…
View article: Analysis of Economic Ripple Effects in the Agricultural Field Using Input–Output Analysis: Drought Damage in Korea in 2018
Analysis of Economic Ripple Effects in the Agricultural Field Using Input–Output Analysis: Drought Damage in Korea in 2018 Open
This study investigates the economic impact of the 2018 agricultural drought in Korea on the agricultural field through input–output analysis. Using industry linkage tables provided by the Bank of Korea, various economic impacts, including…
View article: Effect of mountainous rainfall on uncertainty in flood model parameter estimation
Effect of mountainous rainfall on uncertainty in flood model parameter estimation Open
Explaining the significant variability of rainfall in orographically complex mountainous regions remains a challenging task even for modern raingauge networks. To address this issue, a real-time spatial rainfall field estimation model, cal…
View article: Spatiotemporal variability of vegetation response to meteorological drought on the Korean Peninsula
Spatiotemporal variability of vegetation response to meteorological drought on the Korean Peninsula Open
To assess vegetation drought, it is important to understand the relationship between climate and vegetation and to accurately measure the response of vegetation activity to meteorological drought. In this study, we used the vegetation heal…
View article: Exploring Climate Sensitivity in Hydrological Model Calibration
Exploring Climate Sensitivity in Hydrological Model Calibration Open
In the context of hydrological model calibration, observational data play a central role in refining and evaluating model performance and uncertainty. Among the critical factors, the length of the data records and the associated climatic c…
View article: Optimal Probability Distribution and Applicable Minimum Time-Scale for Daily Standardized Precipitation Index Time Series in South Korea
Optimal Probability Distribution and Applicable Minimum Time-Scale for Daily Standardized Precipitation Index Time Series in South Korea Open
The Standardized Precipitation Index (SPI) is a standardized measure of the variability of precipitation and is widely used for drought assessment around the world. In general, the probability distribution used to calculate the SPI in many…
View article: Streamflow Predictions in Ungauged Basins Using Recurrent Neural Network and Decision Tree-Based Algorithm: Application to the Southern Region of the Korean Peninsula
Streamflow Predictions in Ungauged Basins Using Recurrent Neural Network and Decision Tree-Based Algorithm: Application to the Southern Region of the Korean Peninsula Open
River runoff predictions in ungauged basins are one of the major challenges in hydrology. In the past, the approach using a physical-based conceptual model was the main approach, but recently, a solution using a data-driven model has been …
View article: Estimation of Real-Time Rainfall Fields Reflecting the Mountain Effect of Rainfall Explained by the WRF Rainfall Fields
Estimation of Real-Time Rainfall Fields Reflecting the Mountain Effect of Rainfall Explained by the WRF Rainfall Fields Open
The effect of mountainous regions with high elevation on hourly timescale rainfall presents great difficulties in flood forecasting and warning in mountainous areas. In this study, the hourly rainfall–elevation relationship of the regional…
View article: Investigation of optimal probability distribution of Standard Precipitation Index for daily precipitation time series in Southern Korean Peninsula
Investigation of optimal probability distribution of Standard Precipitation Index for daily precipitation time series in Southern Korean Peninsula Open
The Standardized Precipitation Index (SPI) is applied worldwide for drought assessment. In general, in many studies, SPI was estimated from a two-parameter gamma distribution. However, in other climatic regions, there are also studies that…
View article: Wetland inflow simulation using artificial intelligence prediction model based on classification for water surface area identification
Wetland inflow simulation using artificial intelligence prediction model based on classification for water surface area identification Open
Wetland ecosystems have complex interactions of physical and biogeochemical processes, but the first step toward restoring the health of wetland ecosystems is an accurate understanding of the water cycle in wetland ecosystems. In addition,…
View article: Monthly vegetation drought forecasting using copula functions, numerical weather prediction and artificial intelligence models
Monthly vegetation drought forecasting using copula functions, numerical weather prediction and artificial intelligence models Open
Drought inhibits vegetation growth, triggers wildfires, reduces agricultural production and has a significant impact on the health of terrestrial ecosystems. Continuously monitoring and forecasting the effects of drought on vegetation heal…
View article: Ecological Drought Condition Index to Monitor Vegetation Response to Meteorological Drought in Korean Peninsula
Ecological Drought Condition Index to Monitor Vegetation Response to Meteorological Drought in Korean Peninsula Open
Droughts caused by meteorological factors such as a long-term lack of precipitation can propagate into several types of drought through the hydrological cycle. Among them, a phenomenon in which drought has a significant impact on the ecosy…
View article: Characterization of the Propagation of Meteorological Drought Using the Copula Model
Characterization of the Propagation of Meteorological Drought Using the Copula Model Open
Drought is a phenomenon that is caused by several factors and can be divided into meteorological drought, agricultural drought, hydrological drought, and socioeconomic drought. In this study, the characteristics of propagating from meteoro…
View article: Learning Enhancement Method of Long Short-Term Memory Network and Its Applicability in Hydrological Time Series Prediction
Learning Enhancement Method of Long Short-Term Memory Network and Its Applicability in Hydrological Time Series Prediction Open
Many studies have applied the Long Short-Term Memory (LSTM), one of the Recurrent Neural Networks (RNNs), to rainfall-runoff modeling. These data-driven modeling approaches learn the patterns observed from input and output data. It is wide…
View article: Development and Application of a Rainfall Temporal Disaggregation Method to Project Design Rainfalls
Development and Application of a Rainfall Temporal Disaggregation Method to Project Design Rainfalls Open
A climate model is essential for hydrological designs considering climate change, but there are still limitations in employing raw temporal and spatial resolutions for small urban areas. To solve the temporal scale gap, a temporal disaggre…
View article: Vegetation Drought Vulnerability Mapping Using a Copula Model of Vegetation Index and Meteorological Drought Index
Vegetation Drought Vulnerability Mapping Using a Copula Model of Vegetation Index and Meteorological Drought Index Open
Since vegetation is closely related to a variety of hydrological factors, the vegetation condition during a drought is greatly affected by moisture supply or moisture demand from the atmosphere. However, since feedback between vegetation a…
View article: Identification of the Relative Importance of Factors Affecting the Spatial Variability of River Water Quality
Identification of the Relative Importance of Factors Affecting the Spatial Variability of River Water Quality Open
Understanding the temporal and spatial variability of water quality is important in order to establish effective customized management strategies for polluted aquatic ecosystems. Although various water quality management methods have been …
View article: The applicability of LID facilities as an adaptation strategy of urban CSOs management for climate change
The applicability of LID facilities as an adaptation strategy of urban CSOs management for climate change Open
The magnitude and frequency of extreme rainfall due to climate change is increasing. Increasing rainfall causes serious hydrological problems in cities. Rainfall does not infiltrate the soil, but mostly flows through the sewer pipes into t…
View article: Meteorological Extremes in Korea: Prediction, Assessment, and Impact
Meteorological Extremes in Korea: Prediction, Assessment, and Impact Open
The extreme climates that occur around the world every year have a profound impact on the quality of life for mankind since they can cause natural disasters beyond our control, such as droughts and floods [...]
View article: Effect of warming climate on extreme daily rainfall depth using non-stationary Gumbel model with temperature co-variate
Effect of warming climate on extreme daily rainfall depth using non-stationary Gumbel model with temperature co-variate Open
In this study, non-stationary frequency analysis was carried out to apply non-stationarity of extreme rainfall driven by climate change using the scale parameter of two parameters of the Gumbel distribution (GUM) as a co-variate function. …
View article: Non-Stationary Frequency Analysis and Uncertainty of Heat Wave Events
Non-Stationary Frequency Analysis and Uncertainty of Heat Wave Events Open
Due to global warming, there is an increasing concern regarding persistent and severe heat waves. The maximum daily surface air temperature observations show strong non-stationary features, and the increased intensity and persistence of he…
View article: Usefulness of Global Root Zone Soil Moisture Product for Streamflow Prediction of Ungauged Basins
Usefulness of Global Root Zone Soil Moisture Product for Streamflow Prediction of Ungauged Basins Open
Using modelling approaches to predict stream flow from ungauged basins requires new model calibration strategies and evaluation methods that are different from the existing ones. Soil moisture information plays an important role in hydrolo…
View article: Uncertainty of Rate of Change in Korean Future Rainfall Extremes Using Non-Stationary GEV Model
Uncertainty of Rate of Change in Korean Future Rainfall Extremes Using Non-Stationary GEV Model Open
Interest in future rainfall extremes is increasing, but the lack of consistency in the future rainfall extremes outputs simulated in climate models increases the difficulty of establishing climate change adaptation measures for floods. In …