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Experimental study on the mechanisms of flow and sediment transport in a vegetated channel

Qu, Geng, Pan, Shunqi, Hu, Chengwei, Yao, Shiming, Ding, Bing, Qu, Geng and Liu, Fang 2020. Experimental study on the mechanisms of flow and sediment transport in a vegetated channel. Proceedings of the ICE - Water Management 173 (5) , pp. 249-264. 10.1680/jwama.19.00074
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Abstract

Laboratory experiments were conducted in a flume with 3 types of artificial flexible submerged and emergent vegetation. Detailed velocity and sediment concentration in the channel were measured. The results show that submerged and emergent vegetation generates a much greater resistance to flow, and significantly alters the vertical distributions of velocity, especially in the vegetated and downstream regions. In comparison with the non-vegetated case, the turbulence kinetic energy and Reynolds stresses in the vegetated and downstream regions are much higher, indicating strong flow turbulence and momentum exchange in these areas. The high turbulence also results in a nearly constant fine suspended sediment concentration in the water column for all cases, while the increased resistance causes the coarser suspended sediment concentration to decrease. In addition, the sediment retention by the vegetation with small height is insignificant, but for the canopy with large height, the significant sediment deposition is found at the upstream region of the vegetated region.

Item Type: Article
Date Type: Published Online
Status: Published
Schools: Engineering
Publisher: Thomas Telford (ICE Publishing)
ISSN: 1741-7589
Date of First Compliant Deposit: 27 April 2020
Date of Acceptance: 24 March 2020
Last Modified: 09 Sep 2020 09:25
URI: http://orca.cf.ac.uk/id/eprint/131229

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