SWAT모형의 시단위 및 일단위 유출 모의성능 비교
Comparison of Hourly and Daily SWAT Results for the Evaluation of Runoff Simulation Performance
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참고문헌
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초록
This study aims to evaluate the Soil and Water Assessment Tool (SWAT) hourly hydrological modeling performance and compare it with daily SWATmodeling parameters. For the Byeolmicheon catchment (1.17 km2) located in the upstream of Gyeongancheon watershed and total 18 storm eventsmeasured during 3 years (2011-2013), the hourly SWAT was calibrated and validated using the Green and Ampt (G&A) infiltration equation. Thedetermination coefficient (R2) and Nash-Sutcliffe model efficiency (NSE) of hourly SWAT discharge were 0.81 and 0.73 respectively, and the mostsensitive parameter was soil saturated hydraulic conductivity (SOL_K) and calibrated with the average value of 0.075 mm/hr. In addition, the hourlySWAT simulation by G&A was compared with the daily SWAT simulation by SCS-CN (Soil Conservation Service-Curve Number) method for thewhole 3 years period. The houlrly G&A results showed R2 and NSE of 0.71 and 0.50, and the daily SCS-CN results were 0.71 and 0.66, respectively. TheSOL_K by daily SCS_CN method was calibrated at 75.5 mm/hr, 1,000 times greater than the hourly G&A method. The next sensitive parameters for thehourly simulation were lag time of lateral flow (LAT_TIME) and lag time of surface runoff (SURLAG).
Abstract
This study aims to evaluate the Soil and Water Assessment Tool (SWAT) hourly hydrological modeling performance and compare it with daily SWATmodeling parameters. For the Byeolmicheon catchment (1.17 km2) located in the upstream of Gyeongancheon watershed and total 18 storm eventsmeasured during 3 years (2011-2013), the hourly SWAT was calibrated and validated using the Green and Ampt (G&A) infiltration equation. Thedetermination coefficient (R2) and Nash-Sutcliffe model efficiency (NSE) of hourly SWAT discharge were 0.81 and 0.73 respectively, and the mostsensitive parameter was soil saturated hydraulic conductivity (SOL_K) and calibrated with the average value of 0.075 mm/hr. In addition, the hourlySWAT simulation by G&A was compared with the daily SWAT simulation by SCS-CN (Soil Conservation Service-Curve Number) method for thewhole 3 years period. The houlrly G&A results showed R2 and NSE of 0.71 and 0.50, and the daily SCS-CN results were 0.71 and 0.66, respectively. TheSOL_K by daily SCS_CN method was calibrated at 75.5 mm/hr, 1,000 times greater than the hourly G&A method. The next sensitive parameters for thehourly simulation were lag time of lateral flow (LAT_TIME) and lag time of surface runoff (SURLAG).
참고문헌 (18)
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