한국산학기술학회논문지 (Journal of the Korea Academia-Industrial cooperation Society)

  • 제15권1호
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  • Pages.495-505
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  • 2014
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  • 1975-4701(pISSN)
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  • 2288-4688(eISSN)
한국산학기술학회 (The Korea Academia-Industrial cooperation Society)
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강변저류지 홍수위 저감효과 분석을 위한 수치모형 적용

Numerical Model Application for Analysis of Flood Level Mitigation due to Retention-Basin

  • 조길제 (한국건설기술연구원 하천해안연구실) ;
  • 이동섭 (한국건설기술연구원 하천해안연구실) ;
  • 김형준 (한국건설기술연구원 하천해안연구실)
  • Cho, Gilje (River and Coastal Research Division, Korea Institute of Construction Technology) ;
  • Rhee, Dong Sop (River and Coastal Research Division, Korea Institute of Construction Technology) ;
  • Kim, Hyung-Jun (River and Coastal Research Division, Korea Institute of Construction Technology)
  • 투고 : 2013.11.07
  • 심사 : 2014.01.09
  • 발행 : 2014.01.31
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초록

강변저류지는 홍수량을 일시적으로 분담하여 홍수위험도를 저감시키는 시설로 국내에서도 대하천 정비사업을 통하여 여주, 나주, 영월 지역의 홍수 저감을 위하여 강변저류지가 새로이 설치되었다. 본 연구에서는 신규 도입된 강변저류지 중 여주 강변저류지를 대상으로 1차원 및 2차원 수치모의를 수행하여 대하천에서의 강변저류지에 의한 홍수위 저감효과를 분석하였다. 1차원 모의는 HEC-RAS 및 FLDWAV 모형의 저류지 기능을 적용하여 부정류 모의를 통한 홍수위 저감효과를 분석하였으며, 2차원 모의는 CCHE2D 모형을 이용하여 1차원 모형과 동일한 홍수 사상을 적용한 후 홍수위 저감효과를 분석하였다. 1차원 모의에서는 월류제 부근에서 첨두홍수위가 가장 크게 감소하였으며, 2차원 모의에서는 모의 구간의 가장 상류에서 홍수위 저감 효과가 가장 크게 나타났다. 또한 첨두홍수위는 1차원 모형에서 최대 0.13 m, 2차원 모형에서는 최대 0.20 m가 감소하는 것으로 나타났다. 검토 결과 2차원 모형이 하도 흐름에 대한 지형의 물리적 특성이 반영되어 보다 합리적인 모의 결과를 얻는 것이 가능한 것으로 보이며, 횡월류위어의 부근에서 하도 내 흐름 거동뿐만 아니라 월류 유량이 유입된 후 강변저류지 내 거동을 검토하기에는 1차원 모형보다 유리한 것으로 나타났다.

The retention basin is a river-facility for the flood mitigation by storing the river flow temporarily. The new 3 retention basins are installed in these regions YeoJu, NaJu, YoungWol by the Large River Management Project. In this study, 1D and 2D numerical flow simulation are conducted to evaluate the reduction effect of the peak flood stage for the YeoJu retention basin. HEC-RAS and FLDWAV models are used for 1D simulation with the option of retention basin. CCHE2D model is used for 2D simulation with the same hydrograph used in 1D simulation. It is verified that the peak flood stage is reduced very largely about 0.13 m near the overtopping section of the levee in 1D simulation. It is verified that the peak flood stage is reduced very largely about 0.20 m at the upstream-end of the simulated reach in 2D simulation. 2D simulation for the retention basin is more reasonable because physical characteristics of topography in the model, and also more advantageous for the evaluation of the flow characteristics of the in- and outside of the retention basin on the results of simulation of this study.

키워드

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피인용 문헌

  1. Development of Simplified Computer Program for the Design of Size and Culvert Outlet in Detention Pond vol.47, pp.7, 2014, https://doi.org/10.3741/JKWRA.2014.47.7.587
  2. 2D Numerical Simulations for Shallow-water Flows over a Side Weir vol.48, pp.11, 2015, https://doi.org/10.3741/JKWRA.2015.48.11.957