A STUDY OF DRAG COEFFICIENT RELATED WITH VEGETATION BASED ON THE FLUME EXPERIMEN

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A STUDY OF DRAG COEFFICIENT RELATED WITH VEGETATION BASED ON THE FLUME EXPERIMENT

This study is focused on the effects of ecological factors (diameter and flexibility) and vegetation community composition on the drag coefficient related with vegetation. The single leafy shrub and three mixed communities (including shrub-grass, shrub-reed and reed-grass community) were studied. The flow velocity and water level were measured and used to calculate the drag coefficient based on the Bernoulli's equation, Darcy drag formula and the expression for the drag coefficient related with Darcy drag factor. The trend of the drag coefficient in the vertical direction was analyzed against flow depth, diameter, diameter Reynolds number, flow depth Reynolds number and relative roughness height in different discharges. The results show that beside the dense leafy shrubs community, the vertical trend of the drag coefficient among other cases against flow depth, diameter, diameter Reynolds number, flow depth Reynolds number and relative roughness height can be approximately expressed by power law functions urlder different flow discharges. Moreover, in a mixed community with two plants with distinctly different ecological factors, the one with the most distinct variations of ecological factors determines the vertical trend of the drag coefficient; the other one only affects the magnitude of the drag coefficient. Furthermore, if the ecological factors of the vegetation in the vertical direction are kept almost not changed, the drag coefficient can be approximately regarded as a constant.水利论文)w%[ sE;H.jqG"t

作 者: HUI Er-qing HU Xing-e JIANG Chun-bo MA Fang-kai ZHU Zhen-duo  
作者单位:HUI Er-qing,HU Xing-e(China Three Gorges Corporation,Yichang 443002,China;State Key Laboratory of Hydroscience and Engineering,Tsinghua University,Beijing 100084,China)
-mNp0V y'_R0JIANG Chun-bo,MA Fang-kai,ZHU Zhen-duo(State Key Laboratory of Hydroscience and Engineering,Tsinghua University,Beijing 100084,China) 
刊 名:水动力学研究与进展B辑  ISTIC EI
英文刊名:JOURNAL OF HYDRODYNAMICS 
年,卷(期):2010 22(3) 
分类号:TV1 
关键词:vegetated channel   drag coefficient   flume experiment  
机标关键词:FLUME EXPERIMENTBASEDVEGETATIONRELATEDDRAG COEFFICIENTdrag coefficientReynolds numberdiameterroughness heightvegetationfactorsdifferentflow velocitycommunity compositiondepthdirectionrelatedwater levelpower lawresults 
基金项目:Project supported by the China National Funds for Distinguished Young Scientists,the National Key Technology R and D Program in the 11th Five Year Plan of China,the State Key Laboratory of Hydroscience and Engineering, Tsinghua University,the National Key Basic Research Project of China (973 Program) 
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