Journal of Korean Society on Water Environment (한국물환경학회지)

Korean Society on Water Environment (한국물환경학회)
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Direct Runoff Simulation using CN Regression Equation for Bocheong Stream

유출곡선지수 회귀식을 이용한 보청천유역의 직접유출 모의연구

  • Kwak, Jae Won (Department of Civil Engineering, INHA University) ;
  • Kim, Soo Jun (Department of Civil Engineering, INHA University) ;
  • Yin, Shan hua (Department of Civil Engineering, INHA University) ;
  • Kim, Hung Soo (Department of Civil Engineering, INHA University)
  • 곽재원 (인하대학교 공과대학 사회기반시스템공학부 토목공학과) ;
  • 김수전 (인하대학교 공과대학 사회기반시스템공학부 토목공학과) ;
  • 윤선화 (인하대학교 공과대학 사회기반시스템공학부 토목공학과) ;
  • 김형수 (인하대학교 공과대학 사회기반시스템공학부 토목공학과)
  • Received : 2010.01.19
  • Accepted : 2010.06.17
  • Published : 2010.07.30
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Abstract

NRCS Curve Number (CN) method is widely used for practical purposes in the field by engineers and researchers to calculate direct runoff from total rainfall. However, CN is obtained from antecedent moisture condition and soil characteristics and so it has some problems due to its uncertainty. Therefore this study estimated CN of a watershed using asymptotic CN method which can estimate CN by rainfall and runoff data and compared the result with representative CN given by WAMIS. And we performed runoff simulation for rainy season of Bocheong stream by CN regression equation. From the result, we showed that it could be more reasonable to simulate direct runoff using watershed CN regression equation than WAMIS CN. Furthermore, we knew that the equation is more sensitive to small rainfall event.

Keywords

References

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