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http://dx.doi.org/10.9719/EEG.2021.54.2.161

Groundwater Recharge Evaluation on Yangok-ri Area of Hongseong Using a Distributed Hydrologic Model (VELAS)  

Ha, Kyoochul (Geologic Environment Division, Korea institute of Geoscience and Mineral Resources (KIGAM))
Park, Changhui (GeoGreen21 Co., Ltd.)
Kim, Sunghyun (GeoGreen21 Co., Ltd.)
Shin, Esther (GeoGreen21 Co., Ltd.)
Lee, Eunhee (Geologic Environment Division, Korea institute of Geoscience and Mineral Resources (KIGAM))
Publication Information
Economic and Environmental Geology / v.54, no.2, 2021 , pp. 161-176 More about this Journal
Abstract
In this study, one of the distributed hydrologic models, VELAS, was used to analyze the variation of hydrologic elements based on water balance analysis to evaluate the groundwater recharge in more detail than the annual time scale for the past and future. The study area is located in Yanggok-ri, Seobu-myeon, Hongseong-gun, Chungnam-do, which is very vulnerable to drought. To implement the VELAS model, spatial characteristic data such as digital elevation model (DEM), vegetation, and slope were established, and GIS data were constructed through spatial interpolation on the daily air temperature, precipitation, average wind speed, and relative humidity of the Korea Meteorological Stations. The results of the analysis showed that annual precipitation was 799.1-1750.8 mm, average 1210.7 mm, groundwater recharge of 28.8-492.9 mm, and average 196.9 mm over the past 18 years from 2001 to 2018 in the study area. Annual groundwater recharge rate compared to annual precipitation was from 3.6 to 28.2% with a very large variation and average 14.9%. By the climate change RCP 8.5 scenario, the annual precipitation from 2019 to 2100 was 572.8-1996.5 mm (average 1078.4 mm) and groundwater recharge of 26.7-432.5 mm (average precipitation 16.2%). The annual groundwater recharge rates in the future were projected from 2.8% to 45.1%, 18.2% on average. The components that make up the water balance were well correlated with precipitation, especially in the annual data rather than the daily data. However, the amount of evapotranspiration seems to be more affected by other climatic factors such as temperature. Groundwater recharge in more detailed time scale rather than annual scale is expected to provide basic data that can be used for groundwater development and management if precipitation are severely varied by time, such as droughts or floods.
Keywords
groundwater; recharge; VELAS; climate change scenario; water budget analysis;
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