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DOI : , Vol.19, No.1, 11 ~ 18, 2011
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| Title |
| Simulation of Stream flow using SWAT Auto Calibration Tool over the Saemangeum Watershed |
| 정재운 Jae Woon Jung , 장정렬 Jeong Ryeol Jang , 임병진 Byung Jin Lim , 이영재 Yeong Jae Lee , 김갑순 Kap Soon Kim , 강재홍 Jae Hong Kang , 박혜린 Hye Lin Park , 조소현 So Hyun Cho , 윤광식 Kwang Sik Yoon |
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| Abstract |
| Application of auto-calibration tool of the Soil and Water Assessment Tool(SWAT) model was evaluated for long-term stream flow simulation from the Samangeum watershed. Hydrologic parameters calibration for basin scale such as Samangeum watershed is quite challenging task since huge variations of hydrologic properties of HRU`s. In this study, the sensitivity analysis of hydrologic parameters was initially conducted to evaluate auto-calibration tool of the SWAT model. The most sensitive parameters were: channel effective hydraulic conductivity(CH_K2), SCS Curve Number II value (CN2), surface runoff lag time(SURLAG), base flow alpha factor (Alpha_Bf), soil evaporation compensation factor(ESCO), and available water capacity (Sol_Awc), respectively. After sensitivity analysis, some important parameters were selected for SWAT model optimization. Calibration of selected parameters was conducted using auto calibration tool of SWAT model over the Saemangeum Watershed. The comparison between the observed and simulated stream flow indicated that there was a good agreement between the observed and simulated discharge, which was verified by coefficient of determination (R2) and Nash Sutcliffe efficiency (NSE) greater than 0.5. We found that auto-calibration tool of SWAT model was reliable for the optimization of parameters reflecting Saemangeum Watershed conditions. |
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| Key Words |
| SWAT model, Non-point source, calibration, hydrology |
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