Velocity distribution of flow with submerged flexible vegetations based on mixin

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Velocity distribution of flow with submerged flexible vegetations based on mixing-length approach

By choosing a PVC slice to simulate flexible vegetation, we carried out ex-periments in an open channel with submerged flexible vegetation. A 3D acoustic Doppler velocimeter (micro ADV) was used to measure local flow velocities and Reynolds stress. The results show that hydraulic characteristics in non-vegetation and vegetation layers are totally different. In a region above the vegetation, Reynolds stress distribution is linear, and the measured velocity profile is a classical logarithmic one. Based on the concept of new-riverbed, the river compression parameter representing the impact of vegetation on river is given, and a new assumption of mixing length expression is made. The formula for time-averaged velocity derived from the expression requires less parameters and simple calculation, and is useful in applications.水利论文eVTlj

作 者: Wen-xin HUAI Jie HAN Yu-hong ZENG Xiang AN Zhong-dong QIAN  
作者单位:State Key Laboratory of Water Resources and Hydropower Engineering Science, Wuhan University, Wuhan 430072, P. R. China 
刊 名:应用数学和力学(英文版)  EI SCI
英文刊名:APPLIED MATHEMATICS AND MECHANICS 
年,卷(期):2009 30(3) 
分类号:TV133.1 
关键词:flexible vegetation   PVC slice   micro ADV   mixing-length approach   stream-wise velocity distribution   Reynolds stress   river compression parameter  
机标关键词:approachbasedflexibleflowvegetationhydraulic characteristicsstress distributionvelocity profileopen channelcompressionresultssimpleregionnewimpactsliceBasedPVCADV 
基金项目:国家自然科学基金 
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