SWAT Literature Database for Peer-Reviewed Journal Articles

Title:Evaluation of water quality interaction by dam and weir operation using swat in the Nakdong River Basin of South Korea 
Authors:Lee, J., Y. Lee, S. Woo, W. Kim and S. Kim 
Volume (Issue):12(17) 
Article ID:6845 
URL (non-DOI journals): 
Broad Application Category:hydrologic & pollutant 
Primary Application Category:reservoirs, ponds and/or other impoundment effects  
Secondary Application Category:pollutant cycling/loss and transport 
Watershed Description:23,609.3 km^2 Nakdong River, which drains much of southeast South Korea. 
Calibration Summary: 
Validation Summary: 
General Comments: 
Abstract:The purpose of this study was to evaluate the streamflow and water quality (SS, T-N, and T-P) interaction of the Nakdong river basin (23,609.3 km2) by simulating dam and weir operation scenarios using the Soil and Water Assessment Tool (SWAT). The operation scenarios tested were dam control (Scenario 1), dam control and weir gate control (Scenario 2), dam control and sequential release of the weirs with a one-month interval between each weir (Scenario 3), dam control and weir gate full open (Scenario 4), dam control and weir gate sequential full open (Scenario 5), weir gate control (Scenario 6), weir gate full open (Scenario 7), and weir gate sequential full open (Scenario 8). Before evaluation, the SWAT was calibrated and validated using 13 years (2005–2017) of daily multi-purpose dam inflow data from five locations ((Andong Dam (ADD), Imha Dam (IHD), Hapcheon Dam (HCD), Namkang Dam (NKD), and Milyang Dam (MYD))multi-function weir inflow data from seven locations (Sangju Weir (SJW), GumiWeir (GMW), Chilgok Weir (CGW), Gangjeong-Goryeong Weir (GJW), Dalseong Weir (DSW), Hapcheon-Changnyeong Weir (HCW), and Changnyeong-Haman Weir (HAW)), and monthly water quality monitoring data from six locations (Andong-4 (AD-4), Sangju (SJ-2),Waegwan (WG), Hapcheon (HC), Namkang-4 (NK-4), and Mulgeum (MG). For the dam inflows and dam storage, the Nash-Sutcliffe efficiency (NSE) was 0.59~0.78, and the coefficient of determination (R2) was 0.71~0.90. For water quality, the R2 values of SS, T-N, and T-P were 0.58~0.83, 0.53~0.68, and 0.56~0.79, respectively. For the eight dam and weir release scenarios suggested by the Ministry of Environment, Scenarios 4 and 8 exhibited water quality improvement effects compared to the observed data. 
Keywords:SWAT; dam and weir release; release scenario; stream water quality