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http://dx.doi.org/10.5389/KSAE.2016.58.5.059

Comparison of Hourly and Daily SWAT Results for the Evaluation of Runoff Simulation Performance  

Jang, Sun Sook (Dept. of Civil & Environmental System Engineering, Konkuk University)
Kim, Seong Joon (Dept. of Civil & Environmental System Engineering, Konkuk University)
Publication Information
Journal of The Korean Society of Agricultural Engineers / v.58, no.5, 2016 , pp. 59-69 More about this Journal
Abstract
This study aims to evaluate the Soil and Water Assessment Tool (SWAT) hourly hydrological modeling performance and compare it with daily SWAT modeling parameters. For the Byeolmicheon catchment ($1.17km^2$) located in the upstream of Gyeongancheon watershed and total 18 storm events measured during 3 years (2011-2013), the hourly SWAT was calibrated and validated using the Green and Ampt (G&A) infiltration equation. The determination coefficient ($R^2$) and Nash-Sutcliffe model efficiency (NSE) of hourly SWAT discharge were 0.81 and 0.73 respectively, and the most sensitive parameter was soil saturated hydraulic conductivity (SOL_K) and calibrated with the average value of 0.075 mm/hr. In addition, the hourly SWAT simulation by G&A was compared with the daily SWAT simulation by SCS-CN (Soil Conservation Service-Curve Number) method for the whole 3 years period. The houlrly G&A results showed $R^2$ and NSE of 0.71 and 0.50, and the daily SCS-CN results were 0.71 and 0.66, respectively. The SOL_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 the hourly simulation were lag time of lateral flow (LAT_TIME) and lag time of surface runoff (SURLAG).
Keywords
SWAT; Green&Ampt; SCS-CN; Hourly; Daily;
Citations & Related Records
Times Cited By KSCI : 6  (Citation Analysis)
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