Journal of Korea Water Resources Association (한국수자원학회논문집)

Korea Water Resources Association (한국수자원학회)
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Inference of natural flood frequency for the region affected by dams in Nam Han River

남한강 유역 댐 영향 지역의 기본홍수량 추론

  • Kim, Nam Won (Hydro Science and Engineering Research Institute, Korea Institute of Civil Engineering and Building Technology) ;
  • Lee, Jeong Eun (Hydro Science and Engineering Research Institute, Korea Institute of Civil Engineering and Building Technology) ;
  • Lee, Jeongwoo (Hydro Science and Engineering Research Institute, Korea Institute of Civil Engineering and Building Technology)
  • 김남원 (한국건설기술연구원 수자원.하천연구소) ;
  • 이정은 (한국건설기술연구원 수자원.하천연구소) ;
  • 이정우 (한국건설기술연구원 수자원.하천연구소)
  • Received : 2016.04.08
  • Accepted : 2016.05.19
  • Published : 2016.07.30
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Abstract

The objective of this study is to estimate the unregulated flood frequency from Chungju dam to Yangpyung gauging station for the region affected by dams based on the peak discharges simulated by storage function routing model. From the flood frequency analyses, the quantiles for the unregulated flood frequency at 6 sites have similar pattern to each other, and their averaged quantile almost matched to the result from the regional flood frequency analysis. The quantile and annual mean discharge for the unregulated flood frequency for the downstream of Chungju dam show the similar behaviour to those for the upstream area. While the quantile and the annual mean discharge for the regulated flood frequency are significantly different from those for the unregulated flood frequency. In particular, the qunatile shows severe difference as the return period increases, and the annual mean discharge has a tendency to approach to the natural flood as the distance from dam increases.

본 연구에서는 남한강 유역내 충주댐 직하류부터 양평 수위관측소 지점까지 댐의 영향을 받는 지역에 대해 저류함수모형을 이용하여 댐에 의해서 조절되지 않은 자연상태의 홍수량을 모의하고, 이를 근거로 홍수빈도분석을 실시하여 기본홍수량의 거동 특성을 분석하였다. 충주댐 하류부 6지점에 대한 지점빈도해석을 통해 산정한 재현기간에 따른 분위수의 변화는 지점별로 서로 유사하였고, 이의 평균적인 거동은 지역빈도분석 결과와 거의 일치하였다. 충주댐 하류지역 자연홍수량에 대해 계산된 분위수 및 빈도홍수량의 평균치는 충주댐 상류에서 기 도출된 결과와 유사한 특성을 나타내었다. 충주댐 하류지역의 분위수와 빈도홍수량의 평균치는 댐 유무에 따라 큰 차이를 나타내었으며, 특히 분위수는 재현기간이 커짐에 따라 더욱 큰 편차를 보였고, 통제된 경우 빈도홍수량의 평균치는 댐 하류로 갈수록 기본홍수량에 점차 근접해가는 형태를 나타내었다.

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