| Title |
Enhancement and Application of SWAT Auto-Calibration using Korean Ministry of Environment 8-Day Interval Flow,Water Quality data |
| Authors |
강현우 ( Hyun Woo Kang ) ; 류지철 ( Ji Chul Ryu ) ; 강형식 ( Hyung Sik Kang ) ; 최재완 ( Jae Wan Choi ) ; 문종필 ( Jong Pil Moon ) ; 최중대 ( Joong Dae Choi ) ; 임경재 ( Kyoung Jae Lim ) |
| Keywords |
Auto-calibration; Pollutant Load; SWAT model; 8-day interval flow; water quality data |
| Abstract |
Soil and Water Assessment Tool (SWAT) model has been widely used in estimation of flow and water quality at various watersheds worldwide, and it has an auto-calibration tool that could calibrate the flow and water quality data automatically from thousands of simulations. However, only continuous measured day flow/water quality data could be used in the current SWAT auto-calibration tool. Therefore, 8-day interval flow and water quality data measured nationwide by Korean Ministry of Environment (MOE) could not be used in SWAT auto-calibration even though long-term flow and water quality data in the Korean Total Maximum Daily Load (TMDL) watersheds available. In this study, current SWAT auto-calibration was modified to calibrate flow and water quality using 8-day interval flow and water quality data. As a result of this study, the Nash and Sutcliffe Efficiency (NSE) values for flow estimation using auto-calibration are 0.77 (calibration period) and 0.68 (validation period), and NSE value for water quality (T-P load) estimation (using the 8-day interval water quality data) is 0.80. The enhanced SWAT auto-calibration could be used in the estimation of continuous flow and water quality data at the outlet of TMDL watersheds and ungaged point of watersheds. In the next study, the enhanced SWAT auto-calibration will be integrated with Web based Load Duration Curve (LDC) system, and it could be suggested as methods of appraisal of TMDL in South Korea. |