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Analysis of Short-term Runoff Characteristics of CAT-PEST Connected Model using Different Infiltration Analysis Methods

CAT-PEST 연계 모형의 침투 해석 방법에 따른 단기 유출 특성 분석

  • Choi, Shinwoo (Department of Construction Environmental Engineering, University of Science & Technology) ;
  • Jang, Cheolhee (Hydro Science and Engineering Research Institute, Korea Institute of Civil Engineering and Building Technology(KICT)) ;
  • Kim, Hyeonjun (Department of Construction Environmental Engineering, University of Science & Technology)
  • 최신우 (과학기술연합대학원대학교 건설환경공학부) ;
  • 장철희 (한국건설기술연구원 수자원.하천 연구소) ;
  • 김현준 (과학기술연합대학원대학교 건설환경공학부)
  • Received : 2016.10.19
  • Accepted : 2016.11.10
  • Published : 2016.11.30

Abstract

Catchment Hydrologic Cycle Assess Tool (CAT) is a model for hydrologic cycle assessment based on physical parameters. In this study, CAT was applied for short-term runoff simulation and connected with model-independent parameter estimation (PEST) for auto-calibrating parameters. The model performance was compared with HEC-HMS, which is widely used for short-term runoff simulation. The study area is the Pangyo Watershed ($22.9km^2$), which includes the Unjung-Cheon and Geumto-Cheon tributaries of the Tan-Cheon stream. Simulation periods were selected from six rainfall events of a two-year period (2006-2007). For the runoff simulation, CAT was applied using three types of infiltration methods (excess rainfall, Green and Ampt and Horton). Sensitivity analysis was carried out to select the parameters and then CAT was optimized using PEST. The model performance of HEC-HMS and CAT-PEST for the rainfall events were within an acceptable limit with Nash Sutcliffe efficiencies (NSE) of 0.63-0.91 and 0.42-0.93, respectively. The simulation results of HEC-HMS have high accuracy in the case of rainfall events that have a sensitive relationship between initial soil moisture conditions and runoff characteristics. The results of CAT-PEST indicated the possibility of reflecting a real runoff system using various physical parameters.

Keywords

Catchment hydrologic cycle Assessment Tool (CAT);HEC-HMS;parameter optimization;PEST;rainfall-runoff

Acknowledgement

Supported by : 국토교통부, 한국건설기술연구원

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