Journal of Korea Water Resources Association (한국수자원학회논문집)

Korea Water Resources Association (한국수자원학회)
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Parameter Decision of Muskingum Channel Routing Method Based on the Linear System Assumption

선형시스템가정에 근거한 Muskingum 하도추적방법의 매개변수 결정

  • Yoo, Chulsang (School of Civil, Environmental and Architectural Engineering, College of Engineering, Korea Univ.) ;
  • Sin, Jiye (School of Civil, Environmental and Architectural Engineering, College of Engineering, Korea Univ.) ;
  • Jun, Chang Hyun (School of Civil, Environmental and Architectural Engineering, College of Engineering, Korea Univ.)
  • 유철상 (고려대학교 공과대학 건축사회환경공학부) ;
  • 신지예 (고려대학교 공과대학 건축사회환경공학부) ;
  • 전창현 (고려대학교 공과대학 건축사회환경공학부)
  • Received : 2012.10.30
  • Accepted : 2013.01.29
  • Published : 2013.05.31
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Abstract

This study proposes the method for determining the Muskingum channel routing model parameters based on the assumption of linear system. The proposed method was applied to the Chungju dam basin for the evaluation. Additionally, the rainfall-runoff was repeated for the Yeongchun-Chungju dam reach using seven rainfall events observed. Summarizing the results is as follows. First, the concentration time and storage coefficient of a channel reach formed by the subdivision can be expressed as the difference between the concentration times and storage coefficients of upstream and downstream basins. The storage coefficients of the channel reach estimated is equal to the storage coefficient of the Muskingum channel routing model and the weight factor can be simply estimated using the ratio between the concentration time and storage coefficient. Second, the weight factor of the Muskingum model is in inverse proportion to the Russel coefficient, which is in between 0.4166 and 0.625 when considering the Russel coefficients generally applied. Finally the application to the Yeongchun-Chungju dam reach showed that the proposed method is still valid regardless of the limitations such as the uncertainty of the observed data.

본 연구에서는 선형시스템 가정에 근거하여 하도구간에 대한 Muskingum 하도추적모형의 매개변수 결정방법을 제안하였다. 제안된 모형은 충주댐 유역에 적용되어 검토되었다. 추가적으로 영춘-충주댐 유역에 대해 총 7개의 호우사상을 대상으로 유출해석을 실시하고 그 결과를 검토하였다. 그 결과를 정리하면 다음과 같다. 먼저, 유역분할에 의해 발생하는 하도의 집중시간 및 저류상수는 상류 분할유역과 상류 분할유역을 포함한 하류 유역의 집중시간 및 저류상수의 차로써 표현가능하다. 이와 같은 방법으로 산정된 하도구간에서의 저류상수는 Muskingum 하도추적모형의 저류상수와 동일하며, 가중인자 역시 집중시간과 저류상수와의 비를 이용하여 간단히 산정할 수 있다. 둘째, Russel 계수와 Muskingum 모형의 가중인자는 서로 반비례 관계에 있으며 일반적으로 적용되고 있는 Russel 계수의 범위에 해당하는 가중인자의 범위는 0.4166-0.625이다. 마지막으로, 영춘-충주댐 구간을 대상으로 한 적용에서는 관측자료의 불확실성과 같은 한계에도 불구하고 제안된 방법의 유효성을 확인할 수 있었다.

Keywords

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