Journal of The Korean Society of Agricultural Engineers (한국농공학회논문집)

The Korean Society of Agricultural Engineers (한국농공학회)
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Development of Stream Width and Bed-slope Estimation Equations for Preparing Data for Distributed Storm Runoff Model

분포형 강우-유출모형의 하도자료 구축을 위한 하폭 및 하상경사 산정공식 개발

  • 정인균 (건국대학교 생명환경과학대학 사회환경시스템공학과) ;
  • 박종윤 (건국대학교 일반대학원) ;
  • 조형경 (건국대학교 일반대학원) ;
  • 이지완 (건국대학교 일반대학원) ;
  • 김성준 (건국대학교 사회환경시스템공학과)
  • Received : 2010.04.22
  • Accepted : 2010.05.26
  • Published : 2010.07.31
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Abstract

In this study, two estimation equations for preparing stream data for distributed storm runoff model were developed by analyzing the nonlinear relation between upstream flow-length and stream width, and between upstream flow-length and stream bed-slope. The equations for stream cell were tested in Chungjudam watershed (6,661 $km^2$) using KIMSTORM. Six storm events occurring between 2003 and 2008 were selected for the model calibration and verification before the test of equations. The average values of the Nash-Sutcliffe model efficiency (ME), the volume conservation index (VCI), the relative error of peak runoff rate (EQp), and the difference of time to peak runoff (DTp) were 0.929, 1.035, 0.037, and -0.406 hr for the calibrated four storm events and 0.956, 0.939, 0.055, and 0.729 hr for the two verified storm events respectively. The estimation equations were tested to the storm events, and compared the flood hydrograph. The test result showed that the estimation equation of stream width reduced the peak runoff and delaying the time to peak runoff, and the estimation equation of stream bed-slope showed the opposite results.

Keywords

References

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