Journal of The Korean Society of Agricultural Engineers (한국농공학회논문집)

The Korean Society of Agricultural Engineers (한국농공학회)
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Parameter Estimation of VfloTM Distributed Rainfall-Runoff Model by Areal Rainfall Calculation Methods - For Dongchon Watershed of Geumho River -

유역 공간 강우 산정방법에 따른 VfloTM 분포형 강우-유출 모형의 매개변수 평가 - 금호강 동촌 유역을 대상으로 -

  • 김시수 (유량조사사업단 유량조사실 금강유량그룹) ;
  • 정충길 (건국대학교 사회환경시스템공학과) ;
  • 박종윤 (건국대학교 사회환경시스템공학과) ;
  • 정성원 (유량조사사업단) ;
  • 김성준 (건국대학교 사회환경시스템공학과)
  • Received : 2012.06.29
  • Accepted : 2012.12.14
  • Published : 2013.01.31
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Abstract

This study is to evaluate the parameter behavior of VfloTM distributed rainfall-runoff model by applying 3 kinds of rainfall interpolation methods viz. Inverse Distance Weighting (IDW), Kriging (KRI), and Thiessen network (THI). For the 1,544 $km^2$ Dongcheon watershed of Nakdong river, the model was calibrated using 4 storm events in 2007 and 2009, and validated using 2 storm events in 2010. The model was calibrated with Nash-Sutcliffe model efficiency of 0.97 for IDW, 0.94 for KRI, and 0.95 for THI respectively. For the sensitive parameters, the saturated hydraulic conductivity ($K_{sat}$) for IDW, KRI, and THI were 0.33, 0.31, and 0.43 cm/hr, and the soil suction head at the wetting front (${\Psi}_f$) were 4.10, 3.96, and 5.19 cm $H_2O$ respectively. These parameters affected the infiltration process by the spatial distribution of antecedent moisture condition before a storm.

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References

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