KSCE Journal of Civil and Environmental Engineering Research (대한토목학회논문집)

Korean Society of Civil Engeneers (대한토목학회)
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Resilience Assessment of Dams' Flood-Control Service

댐 홍수조절기능의 회복탄력성 산정

  • Received : 2014.08.26
  • Accepted : 2014.09.30
  • Published : 2014.12.01
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Abstract

Recently, due to the climate change, the frequency and intensity of extreme rainfall events have been continuously increased in regions of South Korea. As a consequence, safety issues have been raised especially in the hydrologic safety of old dams designed and constructed by the old standards. In general, for improving hydrologic safety of existing dams, two options are considered: 1) raising dam crest; and 2) constructing or expanding an emergency spillway. In this process, the main criteria of alternative selection are overtopping possibility and cost efficiency of each alternative. This approach is easy to implement but it is subject to major limitation for the proper evaluation of alternatives, overlooking downstream flood damages by any controlled flow of water that is intentionally released from dams to eliminate the possibility of overtopping. Therefore, this study suggests a framework for evaluating the dam safety strengthening alternatives in terms of a comprehensive flood control by applying the concept of resilience. The case study shows that the resilience-based evaluation framework which considering downstream flood damages is effective in the selection of dam safety strengthening alternatives.

최근 기후변화로 인해 극한강우사상의 빈도 및 강도가 증가함에 따라 과거 기준에 의해 설계 시공되어 현재 운영 중인 댐의 수문학적 안전성에 의문이 제기되고 있다. 이에 따라 댐을 증고하거나 여수로를 확장/신설하는 방안이 추진되고 있는데, 이러한 대안을 선정할 때 월류 가능성에 매몰된 나머지 하류 홍수피해를 간과하는 경향이 있다. 이에 본 연구는 회복탄력성의 개념을 도입해 종합적인 홍수조절기능의 관점에서 댐의 안전성 강화 대안을 평가할 수 있는 프레임워크를 제시하였다. 제시된 프레임워크를 활용해 기 수행된 사례에 적용한 결과 각 대안에 따른 홍수유출특성이 선정과정에서 중요한 요소로 평가되어야 함을 확인할 수 있었다.

Keywords

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