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research article

Density effects on solute release from the streambed

Jin, Guangqiu
•
Yang, Wenhai
•
Xu, Huiyu
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2020
Hydrological Processes

Contaminants can be released to the stream from the bed by previous pollution events. The releasing contaminants may cause secondary pollution for a river, which impacts the river’s eco-environmental condition. By means of laboratory experiments and numerical simulations, we investigated density effects on the release of solute from periodic bedforms. The results show that the solute released from the upper streambed is driven by convection induced by the bedforms, and that density effects generally inhibit the solute release from the lower streambed region. Density gradients modify the pore water flow patterns and form circulating flows in the deep streambed area. The formation of circulating flows is affected by the density gradients induced by solute concentration and horizontal pressure gradients due to the the slope of the river. The circulating flows enhance the mixing near the bottom of the streambed and allow exchange between the hyporheic zone and ambient flow zone.

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Type
research article
DOI
10.1002/hyp.13655
Author(s)
Jin, Guangqiu
•
Yang, Wenhai
•
Xu, Huiyu
•
Zhang, Zhongtian
•
Yuan, Saiyu
•
Tang, Hongwu
•
Li, Ling
•
Barry, David Andrew  
Date Issued

2020

Published in
Hydrological Processes
Volume

34

Issue

5

Start page

1144

End page

1153

Subjects

Solute transport

•

Release

•

Variable density

•

Circulating flow

•

Mixing

URL

Journal home page

https://onlinelibrary.wiley.com/journal/10991085
Peer reviewed

REVIEWED

Written at

EPFL

EPFL units
ECOL  
Available on Infoscience
November 2, 2019
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/162637
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