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http://dx.doi.org/10.3741/JKWRA.2020.53.12.1081

Evaluation of stream flow and water quality changes of Yeongsan river basin by inter-basin water transfer using SWAT  

Kim, Yong Won (Department of Civil, Environmental and Plant Engineering, Graduate School, Konkuk University)
Lee, Ji Wan (Department of Civil, Environmental and Plant Engineering, Graduate School, Konkuk University)
Woo, So Young (Department of Civil, Environmental and Plant Engineering, Graduate School, Konkuk University)
Kim, Seong Joon (Division of Civil and Environmental Engineering, College of Engineering, Konkuk University)
Publication Information
Journal of Korea Water Resources Association / v.53, no.12, 2020 , pp. 1081-1095 More about this Journal
Abstract
This study is to evaluate stream flow and water quality changes of Yeongsan river basin (3,371.4 km2) by inter-basin water transfer (IBWT) from Juam dam of Seomjin river basin using SWAT (Soil and Water Assessment Tool). The SWAT was established using inlet function for IBWT between donor and receiving basins. The SWAT was calibrated and validated with 14 years (2005 ~ 2018) data of 1 stream (MR) and 2 multi-functional weir (SCW, JSW) water level gauging stations, and 3 water quality stations (GJ2, NJ, and HP) including data of IBWT and effluent from wastewater treatment plants of Yeongsan river basin. For streamflow and weir inflows (MR, SCW, and JSW), the coefficient of determination (R2), Nash-Sutcliffe efficiency (NSE), root mean square error (RMSE), and percent bias (PBIAS) were 0.69 ~ 0.81, 0.61 ~ 0.70, 1.34 ~ 2.60 mm/day, and -8.3% ~ +7.6% respectively. In case of water quality, the R2 of SS, T-N, and T-P were 0.69 ~ 0.81, 0.61 ~ 0.70, and 0.54 ~ 0.63 respectively. The Yeongsan river basin average streamflow was 12.0 m3/sec and the average SS, T-N, and T-P were 110.5 mg/L, 4.4 mg/L, 0.18 mg/L respectively. Under the 130% scenario of IBWT amount, the streamflow, SS increased to 12.94 m3/sec (+7.8%), 111.26 mg/L (+0.7%) and the T-N, T-P decreased to 4.17 mg/L (-5.2%), 0.165 mg/L (-8.3%) respectively. Under the 70% scenario of IBWT amount, the streamflow, SS decreased to 11.07 m3/sec (-7.8%), 109.74 mg/L (-0.7%) and the T-N, T-P increased to 4.68 mg/L (+6.4%), 0.199 mg/L (+10.6%) respectively.
Keywords
Yeongsan river; Inter-basin water transfer (IBWT); Inlet function; Water transfer scenario; SWAT;
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Times Cited By KSCI : 11  (Citation Analysis)
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