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http://dx.doi.org/10.3741/JKWRA.2020.53.11.985

Groundwater evaluation in the Bokha watershed of the Namhan River using SWAT-MODFLOW  

Han, Daeyoung (Department of Civil, Environmental, and Plant Engineering, Graduate School, Konkuk University)
Lee, Jiwan (Department of Civil, Environmental, and Plant Engineering, Graduate School, Konkuk University)
Jang, Wonjin (Department of Civil, Environmental, and Plant Engineering, Graduate School, Konkuk University)
Kim, Seongjoon (Division of Civil and Environmental Engineering, College of Engineering, Konkuk University)
Publication Information
Journal of Korea Water Resources Association / v.53, no.11, 2020 , pp. 985-997 More about this Journal
Abstract
SWAT (Soil and Water Assessment Tool)-MODFLOW (Modular Groundwater Flow) is a coupled model that linking semi-distributed watershed hydrology with fully-distributed groundwater behavior. In this study, the groundwater simulation results of SWAT and SWAT-MODFLOW were compared for Bokhacheon watershed in Namhan river basin. The models were calibrated and validated with 9 years (2009~2017) daily streamflow (Q) data of Heungcheon (HC) water level gauge station and the daily groundwater level observation data of Yulheon (YH). For SWAT, the groundwater parameters of GW_DELAY, GWQMN, and ALPHA_BF affecting baseflow and recession phase were treated. The SWAT results showed the coefficient of determination (R2) of 0.7 and Nash-Sutcliffe model efficiencies (NESQ, NSEinQ) for Q and 1/Q with 0.73 and -0.1 respectively. For SWAT-MODFLOW, the spatio-temporal aquifer hydraulic conductivity (K, m/day), specific storage (Ss, 1/m), and specific yield (Sy) were applied. The SWAT-MODFLOW showed R2, NSEQ, and NSEinQ of 0.69, 0.74, and 0.51 respectively. The SWAT-MODFLOW considerably enhanced the low flow simulation with the help of aquifer physical information. The total streamflow of SWAT and SWAT-MODFLOW were 718.6 mm and 854.9 mm occupying baseflow of 342.9 mm and 423.5 mm respectively.
Keywords
SWAT; MODFLOW; Groundwater; Aquifer characteristics; SWAT-MODFOW;
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Times Cited By KSCI : 13  (Citation Analysis)
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