Longitudinal dispersive coefficient in channels with aquatic vegetation:A review

作     者：Liu Yang Hao-ze Fang Zhong-hua Yang Wen-xin Huai Liu Yang;Hao-ze Fang;Zhong-hua Yang;Wen-xin Huai

作者机构：State Key Laboratory of Water Resources Engineering and Management Wuhan University Wuhan 430072 China 

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

年 卷 期：2023年第35卷第3期

页      面：379-395页

核心收录：

学科分类：080103[工学-流体力学] 08[工学] 080104[工学-工程力学] 081502[工学-水力学及河流动力学] 0815[工学-水利工程] 0801[工学-力学（可授工学、理学学位）] 

基　　金：supported by the National Natural Science Foundation of China(Grant Nos.52020105006 12272281) 

主　　题：Vegetated flows longitudinal dispersion coefficient spatial heterogeneity 

摘      要：The determination of longitudinal dispersion coefficient in rivers is necessary for pollution control,environmental risk assessment,and *** rivers with aquatic vegetation,the flow field is remarkably modified by canopies,which affects velocity profiles and dispersion characteristics dominated by the heterogeneity of the velocity *** dispersion is deduced from lateral and vertical longitudinal velocity gradients for compound channels with vegetated floodplains and rectangular channels with river-wide vegetation,*** many efforts have been exerted to clarify the dispersion process in different conditions and predict the diffusion of contaminants in vegetated rivers,no studies have introduced it *** study reviews the dispersion coefficient characteristics,including magnitude,main impacted factors,and relationships with flow and vegetation features,in channels with aquatic canopies considering the variation of impact factors changing with the different vegetation and river morphology *** typical methodologies for determining longitudinal dispersion coefficients are also summarized to understand the dispersion processes and *** from the pioneer outcomes of previous studies,the review also emphasizes the deficiency of existing studies and suggests possible future directions for improving the theory of dispersion in vegetated channels.