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http://dx.doi.org/10.9720/kseg.2020.3.253

Estimating Exploitable Groundwater as a Function of Precipitation Using a Distributed Hydrologic Model and Frequency Analysis  

Kim, Minsoo (Department of Earth and Environmental Science, Andong National University)
Jeong, Gyocheol (Department of Earth and Environmental Science, Andong National University)
Lee, Jeong Eun (Department of Land, Water and Environment Research, KICT)
Kim, Min-Gyu (Department of Earth and Environmental Science, Andong National University)
Publication Information
The Journal of Engineering Geology / v.30, no.3, 2020 , pp. 253-268 More about this Journal
Abstract
In this study, recharge rates are estimated using SWAT-K (a distributed hydrological model). The validity of the estimated recharge rates were evaluated by employing the baseflow separation method based on observed hydrological data. The exploitable groundwater is typically determined as the 10-year drought frequency recharge rate that is calculated by average recharge ratio multiplied by 10-year drought frequency precipitation. In practice, however, recharge rates typically decrease in line with precipitation; therefore, exploitable groundwater could be overestimated when average recharge rates are used without considering precipitation. To resolve this overestimation, exploitable groundwater was calculated by re-estimating recharge rates that consider precipitation intensity. By applying this method to the Uiwang, Gwacheon, and Seongnam sub-basins, the exploitable groundwater decreased by 55.5~77.6%, compared with recharge rates obtained using the existing method.
Keywords
distributed hydrologic model; frequency analysis; exploitable groundwater; groundwater recharge; SWAT-K; precipitation;
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Times Cited By KSCI : 4  (Citation Analysis)
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