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Journal of Zhejiang University SCIENCE A 1998 Vol.-1 No.-1 P.

http://doi.org/10.1631/jzus.A2100540


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):  Sichuan University, Chengdu 610065, China; more

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

Key Words:  Mixing degree upstream of the 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, 1998, -1(-1): .

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DOI - 10.1631/jzus.A2100540


Abstract: 
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 study, 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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