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  4. A method for assessing the feasibility of air-bubble screens to reduce morphological gradients in open-channel bends
 
conference paper

A method for assessing the feasibility of air-bubble screens to reduce morphological gradients in open-channel bends

Dugué, Violaine  
•
Blanckaert, Koen  
•
Chen, Qiuwen
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2013
Proceedings of 35th IAHR World Congress
35th IAHR World Congress

Within the fluvial network, confluences are particular areas characterized by great ecological value where flow dynamics and bed morphology are much influenced by local patterns. The aim of this article is to describe the influence of the convergence angle on the morphology and hydrodynamics at river channel confluences, where the tributary bed level is higher than the main channel bed (discordant bed). For that purpose, experiments were carried out in a laboratory flume running three discharge ratio scenarios for two different convergence angles (70 and 90 degrees). The tests were run until equilibrium was reached, i.e. when the outgoing solid discharge was equal or larger than 90% of the incoming. Once the bed topography remained stable, bed and water level surfaces were measured. As a result of these tests, and based on the performed measurements, the convergence angle is identified as an important parameter that influences the main-channel bed morphology features and the water level by modifying the shape and position of the main morphological and flow features. Also, the influence of the discharge ratio (Qr = Qt / Qm) on these modifications is observed and evaluated.

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Type
conference paper
Author(s)
Dugué, Violaine  
Blanckaert, Koen  
Chen, Qiuwen
Schleiss, Anton  
Date Issued

2013

Publisher

TPU

Publisher place

Chine

Published in
Proceedings of 35th IAHR World Congress
Issue

A10229

Start page

1

End page

11

Subjects

Discordant bed

•

River confluences

•

Sediment transport

•

Morphodynamic

•

Convergence angle.

Note

[928]

Editorial or Peer reviewed

REVIEWED

Written at

EPFL

EPFL units
PL-LCH  
Event nameEvent placeEvent date
35th IAHR World Congress

Chengdu, Chine

September 8-13, 2013

Available on Infoscience
September 20, 2013
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/94750
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