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자연하천에 대한 Muskingum-Cunge 모형의 매개변수 산정

Estimation of Muskingum-Cunge Parameters for Natural Streams

  • 김진수 (성균관대학교 공과대학 건설환경시스템공학과 대학원) ;
  • 전경수 (성균관대학교 공과대학 사회환경시스템공학과)
  • Kim, Jin-Soo (Dept. of Civil and Envir. Engrg., Sungkyunkwan Univ.) ;
  • Jun, Kyung-Soo (Dept. of Civil and Envir. Engrg., Sungkyunkwan Univ.)
  • 발행 : 2010.02.28

초록

하도의 횡단 및 종단 지형자료와 조도계수를 이용하여 자연하천에 대한 Muskingum-Cunge 모형의 매개변수들을 추정하는 방법을 제안하였다. 우선 각 단면에서의 다양한 수위에 대하여 통수단면 및 동수반경을 계산한 후, Manning 공식을 이용하여 유량을 산정한다. 이러한 과정은 하도에서의 모든 단면에 대하여 반복되며, 최종적으로 통수단면과 유량을 통한 회귀 분석에 의하여 매개변수들을 추정한다. 이와 같은 Muskingum-Cunge 모형의 매개변수 추정과정을 남한강 구간에 적용하였다. 추정된 매개변수들을 사용한 Muskingum-Cunge 모형의 계산결과는 무차원 RMS 오차, 첨두유량의 크기 및 발생시각 등 모든 면에서 HEC-1의 Muskingum-Cunge 모형에 비하여 동역학적 모형의 계산결과와 잘 일치하는 것으로 나타났다.

A method is proposed of estimating Muskingum-Cunge parameters for natural streams using cross-sectional and longitudinal channel geometry and roughness coefficient data. Firstly, for various water-surface levels at a cross section cross-sectional areas and hydraulic radii are calculated. Corresponding discharges are then calculated using Manning's equation. This procedure is repeated for all cross-sections in the reach. Finally, routing parameters are estimated from the calculated cross-sectional area and discharge value pairs by regression analysis. The procedures for estimating Muskingum-Cunge parameters are applied to the South Han River. Flows calculated by Muskingum-Cunge model with estimated parameters showed much better agreement with those by dynamic wave model in peak discharge, time to peak discharge, and normalized RMS errors than those calculated by the HEC-1 Muskingum-Cunge model.

키워드

참고문헌

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피인용 문헌

  1. Estimation of Flood Water Level for Small to Medium Streams vol.14, pp.3, 2014, https://doi.org/10.9798/KOSHAM.2014.14.3.319