Journal of Korea Water Resources Association (한국수자원학회논문집)

Korea Water Resources Association (한국수자원학회)
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Sensitivity Analysis and Parameter Evaluation of a Distributed Model for Rainfall-Runoff-Soil Erosion-Sediment Transport Modeling in the Naesung Stream Watershed

내성천 유역의 강우-유출-토양침식-유사이송 모의를 위한 분포형 모형의 민감도 분석 및 매개변수 평가

  • Jeong, Won Jun (Hydro-lab, Dept. of Civil and Environmental Engineering, Myongji Univ.) ;
  • Ji, Un (River and Coastal Research Division, Water Resources & Environment Research Department, Korea Institute of Civil Engineering and Building Technology)
  • 정원준 (명지대학교 토목환경공학과 수공학연구실) ;
  • 지운 (한국건설기술연구원 수자원.환경연구본부 하천해안연구실)
  • Received : 2014.09.22
  • Accepted : 2014.10.30
  • Published : 2014.12.31
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Abstract

The distributed watershed model of rainfall-runoff-soil erosion-sedimen transport was constructed for the Naesung Stream Watershed with high potentiality and risk of sediments produced by soil erosion. The sensitivity analyses of roughness coefficient and hydraulic conductivity which affected the modeling results of runoff and sediment concentration were performed in this study. As a result, the change of the roughness coefficient for the forest area from 0.4 to 0.45 did not affect the change in runoff and stream discharge and the average value and range of sediment concentration were also insignificantly increased with few difference. As a result of the sensitivity analysis of the hydraulic conductivity, the total amount of runoff and maximum runoff were gradually increased as the hydraulic conductivity was reduced. In the case of sediment concentration modeling, the average and the range of sediment concentration for all stations were increased as the hydraulic conductivity was decreased. For the Hyangseok Station, in case of the hydraulic conductivity reduced by 50%, the simulation result of sediment concentration was most similar to the estimated value by the sediment rating curve.

유사발생 잠재성 및 토양침식으로 인한 유사발생 위험성이 높은 것으로 평가된 내성천유역을 대상으로 강우-유출-토양침식-유사이송으로 이어지는 유역단위의 분포형 모형을 구축하였으며 유출과 유사농도 모의 결과에 주요한 영향을 미치는 조도계수 및 투수계수의 민감도 분석을 실시하였다. 모의결과, 내성천유역의 토지 피복이 숲인 지역의 조도계수를 0.4에서 0.45로 변경하여 지표수 유출 유속을 감소시킴으로써 향석 지점에서의 유출곡선에 미치는 영향을 분석하였으나 유출수문곡선의 변화에 영향을 미치지 않는 것으로 나타났으며 평균 유사농도 값과 유사농도의 범위에 있어서도 모의 결과가 근소하게 증가하나 유의한 변화는 없는 것으로 나타났다. 투수계수에 대한 민감도 분석 결과, 투수계수 값을 저감 시킬수록 총 유출량 및 첨두 유출량은 점차 증가하는 것으로 나타났다. 유사농도 모의의 경우에도 투수계수를 저감시킬수록 모든 지점에서 평균 유사농도 및 유량에 따른 유사농도 범위가 증가하였으며, 향석 지점의 경우 투수계수를 50% 저감하였을 때 유사 농도 모의 값이 유량-유사량 관계식에 의해 계산된 값과 가장 근사한 것으로 나타났다.

Keywords

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