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

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2022年第9期23卷 733-744页

作者： Jun ZOU Jian-min ZHANG Chang-yuan LI College of Water Resource&Hydropower Sichuan UniversityChengdu 610065China Jiangxi Provincial Institute of Water Sciences Nanchang 330029China

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.

关键词： Mixing degree upstream Diverging area longitudinal distance Deviation of pollutant flux ratio Standard deviation Linear relationship

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