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Flow resistance of one-line emergent vegetation along the floodplain edge of a compound open channel

journal contribution
posted on 21.12.2012, 09:05 by Xin Sun, Koji Shiono
Experiments have been conducted in straight compound channels with and without one-line emergent vegetation along the floodplain edge, in which stream-wise velocities and boundary shear stresses have been measured. The experimental results show that the velocity distribution in the vegetation case is considerably different from that in the no vegetation case and the boundary shear stress is also significantly reduced by the additional flow resistance caused by the vegetation at a similar relative water depth. The apparent shear stress distribution which has been calculated with the boundary shear stress and weight component in the vegetation case is totally different from that in the no-vegetation case. New formulae for friction factors for the with and without vegetation cases are developed using vegetation density and flow parameters. The drag force caused by the vegetation is obtained for two different vegetation density cases and the magnitude of its effect on total flow resistance is then investigated. The force balance method is used to predict discharge and this is compared with the discharge predicted by the new formula. A further analysis of the selection of vegetation spacing is carried out, determining its effect on stage-discharge.

History

School

  • Architecture, Building and Civil Engineering

Citation

SUN, X. and SHIONO, K., 2009. Flow resistance of one-line emergent vegetation along the floodplain edge of a compound open channel. Advances in Water Resources, 32 (3), pp. 430 - 438.

Publisher

© Elsevier Ltd.

Version

VoR (Version of Record)

Publication date

2009

Notes

Closed Access. This article was published in the journal, Advances in Water Resources [© Elsevier Ltd.] and the definitive version is available at: http://dx.doi.org/10.1016/j.advwatres.2008.12.004

ISSN

0309-1708

Language

en

Exports

Loughborough Publications

Exports