Effects of the mixing degree upstream of the diverging area on the pollutant allocation characteristics of a braided river

作     者：Jun ZOU Jian-min ZHANG Chang-yuan LI Jun ZOU;Jian-min ZHANG;Chang-yuan LI

作者机构：College of Water Resource&HydropowerSichuan UniversityChengdu 610065China Jiangxi Provincial Institute of Water SciencesNanchang 330029China 

出 版 物：《Journal of Zhejiang University-Science A(Applied Physics & Engineering)》 (浙江大学学报（英文版）A辑（应用物理与工程）)

年 卷 期：2022年第23卷第9期

页      面：733-744页

核心收录：

学科分类：08[工学] 0815[工学-水利工程] 

基　　金：supported by the National Natural Science Foundation of China(No.51879176) the Jiangxi Provincial Water Conservancy Science and Technology Project(No.202022YBKT09),China 

主　　题：Mixing degree upstream Diverging area Longitudinal distance Deviation of pollutant flux ratio Standard deviation Linear relationship 

摘      要：The mixing degree upstream of the diverging area is one of the important factors influencing the pollutant allocation characteristics of braided rivers,but the effect remains unclear at *** this paper,physical model tests were designed to study the effect on the pollutant flux ratio with six branching forms and a series of longitudinal discharge *** results indicated that the mixing degree upstream of the diverging area,which is closely related to the longitudinal discharge distance,notably affected the pollutant flux *** lower the mixing degree,the larger was the deviation of the pollutant flux ratio from the discharge ***,a linear relationship was attained between the dimensionless mixing degree and the dimensionless deviation of the pollutant flux ratio from the discharge *** of different branching angles or different water layers or different branches did not affect this *** experimental results further demonstrated that the intercept and slope of the aforementioned linear relationship depended on the branching angle and exhibited an opposite monotonicity with a symmetric branch angle as the dividing *** results help towards a better understanding of the mechanism of the factors influencing pollutant transport in complicated braided rivers,and provide a new approach to predicting the pollutant flux ratio of braided rivers.