Stage-Discharge Prediction for Converging Compound Channels with Narrow Floodplains
Publication: Journal of Irrigation and Drainage Engineering
Volume 143, Issue 8
Abstract
Momentum transfer between a main channel and side floodplains tends to increase the floodplain shear and decrease the main channel shear. The increase and decrease in shear are greatly influenced when a compound channel has nonprismatic floodplains. In converging compound channels, water flow on the floodplain crosses over water flow in the main channel, resulting in increased interactions and momentum exchanges. An experimental analysis concerning the distribution of shear stress in the main channel and the floodplain for both prismatic and nonprismatic compound channels under different overbank flow conditions are performed. New equations are developed for predicting boundary shear stress distribution for a compound channel with the nonprismatic flood plain. Using these expressions the stage-discharge relationships for both prismatic and nonprismatic compound channels of lower width ratios are successfully estimated. The efficiency of the models is verified by applying natural river data sets.
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Acknowledgments
We acknowledge thankfully the support from the National Institute of Tehnology, Rourkela and the UGC UKIERI Research Project (ref no UGC-2013 14/017) for carrying out the experimental research work in the Hydraulics laboratory at NITR.
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Information
Published In
Journal of Irrigation and Drainage Engineering
Volume 143 • Issue 8 • August 2017
Copyright
©2017 American Society of Civil Engineers.
History
Received: May 16, 2016
Accepted: Dec 13, 2016
Published online: Mar 27, 2017
Published in print: Aug 1, 2017
Discussion open until: Aug 27, 2017
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