대한토목학회논문집 (KSCE Journal of Civil and Environmental Engineering Research)

  • 제43권6호
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  • Pages.735-747
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  • 2023
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  • 1015-6348(pISSN)
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  • 2799-9629(eISSN)
대한토목학회 (Korean Society of Civil Engeneers)
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자연성기반 홍수완충공간 조성에 따른 홍수위 변화 분석

Analysis of Flood Level Changes by Creating Nature-based Flood Buffering Section

  • 류지원 (과학기술연합대학원대학교 건설환경공학) ;
  • 지운 (한국건설기술연구원 수자원하천연구본부.과학기술연합대학원대학교 건설환경공학) ;
  • 김상혁 ((주)이산 수자원부) ;
  • 장은경 (한국건설기술연구원 수자원하천연구본부)
  • Ryu, Jiwon (University of Science and Technology) ;
  • Ji, Un (Korea Institute of Civil Engineering and Building Technology. University of Science and Technology) ;
  • Kim, Sanghyeok (Isan Corporation) ;
  • Jang, Eun-kyung (Korea Institute of Civil Engineering and Building Technology)
  • 투고 : 2023.09.12
  • 심사 : 2023.10.04
  • 발행 : 2023.12.01
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초록

최근 기후변화로 인한 극한홍수 피해가 급증하고 있어 기존의 홍수관리시설만으로는 홍수피해에 제대로 대응하기 어려운 상황에 직면하고 있다. 이에 본 연구는 이러한 문제에 대처하기 위해 홍수 관리의 자연성 기반 접근 방법 중 하나인 제방 후퇴 및 이설의 효과를 분석하였다. 이를 위해 1차원 수치모델 HEC-RAS를 사용하여 100년 빈도 홍수에 대한 홍수위 및 유속 변화 그리고 최대 홍수위 발생 시점에 대해 분석하였다. 식생 조성 등의 자연성기반 홍수완충공간의 조성 환경 특성을 고려한 조도계수의 선택은 홍수위 변화 분석 결과에 민감하기 때문에 엄격한 기준과 과학적 근거를 기반으로 하였다. 분석결과, 자연기반해법의 홍수완충공간 조성에 따른 홍수위 저감 효과는 상류 구간에서 더 크게 나타났으며, 최대 30 cm의 홍수위가 저감되었다. 일부 홍수터 확장구간에서는 국부적으로 홍수위가 상승하는 현상이 나타나며, 유속 변화는 확장된 통수단면적의 비율에 따라 다양하게 나타났다. 이를 통해 제방 후퇴와 홍수터 확장은 홍수 관리의 효과적인 대안으로 고려될 수 있을 것으로 기대되며, 홍수위 변화, 유속 변화 및 최고 수위 발생 시점에 대한 종합적인 설계가 필요할 것으로 판단된다.

In recent times, the sharp increase in extreme flood damages due to climate change has posed a challenge to effectively address flood-related issues solely relying on conventional flood management infrastructure. In response to this problem, this study aims to consider the effectiveness of nature-based flood management approaches, specifically levee retreat and relocation. To achieve this, we utilized a 1D numerical model, HEC-RAS, to analyze the flood reduction effects concerning floodwater levels, flow velocities, and time-dependent responses to a 100-year frequency flood event. The analysis results revealed that the effect of creating a flood buffer zone of the nature-based solution extends from upstream to downstream, reducing flood water levels by up to 30 cm. The selection of the flow roughness coefficient in consideration of the nature-based flood buffer space creation characteristics should be based on precise criteria and scientific evidence because it is sensitive to the flood control effect analysis results. Notably, floodwater levels increased in some expanded floodplain sections, and the reduction in flow velocities varied depending on the ratio of the expanded cross-sectional area. In conclusion, levee retreat and floodplain expansion are viable nature-based alternatives for effective flood management. However, a comprehensive design approach is essential considering flood control effects, flow velocity reduction, and the timing of peak water levels. This study offers insights into addressing the challenges of climate-induced extreme flooding and advancing flood management strategies.

키워드

과제정보

Research for this paper was carried out under the KICT Research Program (project no. 20230115-001, Development of IWRM-Korea Technical Convergence Platform Based on Digital New Deal) funded by the Ministry of Science and ICT.

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