한국수자원학회논문집 (Journal of Korea Water Resources Association)

  • 제43권6호
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  • Pages.517-524
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  • 2010
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  • 2799-8746(pISSN)
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  • 2799-8754(eISSN)
한국수자원학회 (Korea Water Resources Association)
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복단면 개수로흐름에서 홍수터 식생의 흐름저항을 반영한 1차원 모형

One-Dimensional Model for Flow Resistance of Floodplain Vegetation in Compound Open-Channel Flow

  • 박문형 (한국건설기술연구원 하천. 해안항만연구실)
  • Park, Moon-Hyeong (River, Coastal and Harbor Research Division, Korea Institute of Construction Technology)
  • 투고 : 2010.04.07
  • 심사 : 2010.04.14
  • 발행 : 2010.06.30
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초록

본 연구에서는 식생이 포설된 홍수터를 포함하는 복단면 개수로 흐름의 수위를 예측하기 위하여 유효 전단응력기법에 근거한 일차원 모형을 제시하였다. 제안된 모형은 주수로와 홍수터 접합부에서 발생하는 운동량 교환효과를 와점성계수 개념을 이용하여 반영할 수 있다. 주수로와 홍수터의 경계에서 발생하는 경계와점성계수는 3차원 레이놀즈 응력 모형을 이용하여 결정하였다. 경계와점성계수의 영향을 파악하기 위하여 민감도분석을 수행하였다. 경계와점성계수의 변화에 대하여 배수곡선의 변화는 크지 않았으나, 홍수터에서 부담하는 유량은 경계와점성계수에 비례하여 증가하였다. 마지막으로 식생된 홍수터의 식생밀도 및 침수비에 따른 경계와점성계수의 변화를 살펴보았다. 계산된 경계와점성계수는 식생밀도와 침수비에 비례하며, 대략$(2-5){\times}\;10^{-4}$ 정도의 값을 갖는 것으로 나타났다.

In this study, the 1D apparent shear stress model for vegetated compound open-channel flows was suggested. To consider the effect of momentum exchange between main channel and floodplain, the eddy viscosity concept was used in the present model. The interfacial eddy viscosity in the interface of main channel and floodplain was determined from the 3D Reynolds stress model. The evaluated interfacial eddy viscosity appears to be good agreement with those proposed previously. To investigate the effect of interfacial eddy viscosity, sensitive analysis was carried out. the computed backwater profiles are nearly identical with respect to the value of the interfacial eddy viscosity. However, the discharge conveyed by the floodplain changes is proportional to the interfacial eddy viscosity. Finally, the changes of the interfacial eddy viscosity due to the vegetation density and vegetation height were examined. The computed results of interfacial eddy viscosity are in proportion to the vegetation density and vegetation height, and the interfacial eddy viscosity has a range of $(2-5)\;{\times}\;10^{-4}$.

키워드

참고문헌

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피인용 문헌

  1. 1D Numerical Model for Rivers Flows with Emergent Vegetations on Floodplains and Banks vol.44, pp.1, 2011, https://doi.org/10.3741/JKWRA.2011.44.1.9