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On-line Access: 2022-06-22

Received: 2021-10-26

Revision Accepted: 2022-05-23

Crosschecked: 2022-09-22

Cited: 0

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Citations:  Bibtex RefMan EndNote GB/T7714


Jian-min ZHANG


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Journal of Zhejiang University SCIENCE A 2022 Vol.23 No.9 P.733-744


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

Author(s):  Jun ZOU, Jian-min ZHANG, Chang-yuan LI

Affiliation(s):  College of Water Resource & Hydropower, Sichuan University, Chengdu 610065, China; more

Corresponding email(s):   zhangjianmin@scu.edu.cn

Key Words:  Mixing degree upstream, Diverging area, Longitudinal distance, Deviation of pollutant flux ratio, Standard deviation, Linear relationship

Jun ZOU, Jian-min ZHANG, Chang-yuan LI. Effects of the mixing degree upstream of the diverging area on the pollutant allocation characteristics of a braided river[J]. Journal of Zhejiang University Science A, 2022, 23(9): 733-744.

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%A Jun ZOU
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%A Chang-yuan LI
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%DOI 10.1631/jzus.A2100540

T1 - Effects of the mixing degree upstream of the diverging area on the pollutant allocation characteristics of a braided river
A1 - Jun ZOU
A1 - Jian-min ZHANG
A1 - Chang-yuan LI
J0 - Journal of Zhejiang University Science A
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PB - Zhejiang University Press & Springer
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DOI - 10.1631/jzus.A2100540

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 present. In 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 distances. The 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 ratio. The lower the mixing degree, the larger was the deviation of the pollutant flux ratio from the discharge ratio. Moreover, a linear relationship was attained between the dimensionless mixing degree and the dimensionless deviation of the pollutant flux ratio from the discharge ratio. Consideration of different branching angles or different water layers or different branches did not affect this trend. The 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 point. These 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.




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