Effects of vegetation patch density on flow velocity characteristics in an open channel

作     者：Wen-qi Li Dan Wang Jun-li Jiao Ke-jun Yang 

作者机构：State Key Laboratory of Hydraulics and Mountain River EngineeringSichuan UniversityChengdu 610065China 

出 版 物：《Journal of Hydrodynamics》 (水动力学研究与进展B辑（英文版）)

年 卷 期：2019年第31卷第5期

页      面：1052-1059页

核心收录：

学科分类：0710[理学-生物学] 071001[理学-植物学] 07[理学] 

基　　金：Project supported by the National Natural Science Foundation of China(Grant Nos.51539007,51479128 and 51609160) the National Key Research and Development Program of China(Grant No.2016YFC0402302) 

主　　题：Vegetation density stream-wise velocity depth-averaged velocity lateral distribution longitudinal distribution open channel 

摘      要：The aquatic plants are often found in natural rivers,and they affect the channel flow structure *** study the effects of the vegetation density a(the frontal area per volume)on the flow velocity characteristics,rigid bamboo circular cylinders are chosen as the model emergent *** the experiments,the density of the vegetation takes various values while all other flow parameters are kept constant.A 3-D acoustic Doppler velocimeter(ADV)is used to measure the local flow velocities for different vegetation *** results show that the existence of the vegetation patch leads to an increase of the depth-averaged velocity on the right and left sides behind the vegetation patch,and it increases monotonically with the vegetation *** different vegetation densities,the lateral distribution of the stream-wise velocity behind the vegetation patch follows approximately an S-shaped profile when a≤60 m-1,and a logarithmic profile if a60 *** vertical distribution of the stream-wise velocity along the channel varies with the vegetation density and also follows an S-shaped distribution in a certain range,with the locations and the ranges being affected by the vegetation density.