Flow Resistance in a Compound Channel with Diverging and Converging Floodplains
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Volume 144, Issue 8
Abstract
Experiments were performed in the symmetric compound channel with diverging and converging floodplains for different relative flow depths to investigate the resistance characteristics of overbank flow in nonprismatic sections. The effectiveness of Manning’s , Darcy-Weisbach’s and Chezy’s are analyzed. Manning’s roughness coefficient relies upon the nondimensional parameters like width ratio, aspect ratio, relative flow depth, angles (diverging and converging angles), relative distance, bed slope, Reynolds number, and Froude number. A multivariable regression model has been developed by taking care of the aforementioned geometric and hydraulic parameters to estimate the Manning’s roughness coefficient for nonprismatic compound channels. The nonlinear regression models are developed using pertinent experimental data obtained from laboratory experiments and the data from other researchers on the compound channel with nonprismatic floodplains. The present model gives satisfactory results as compared to other approaches for different experimental channels and field data by providing less error.
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Acknowledgments
The authors wish to thank the editors and reviewers for their time in effort in reviewing the manuscript. The authors also wish to acknowledge the support from UGC UKIERI Research project (Ref No. UGC-2013 14/017) for carrying out the research work in the Hydraulic Laboratory at National Institute of Technology, Rourkela. The first author wishes to express sincere thanks to Dr. Kamalini Devi for her support during the analysis of experimental results and the empirical model development processes.
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Journal of Hydraulic Engineering
Volume 144 • Issue 8 • August 2018
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©2018 American Society of Civil Engineers.
History
Received: Apr 13, 2017
Accepted: Feb 26, 2018
Published online: Jun 12, 2018
Published in print: Aug 1, 2018
Discussion open until: Nov 12, 2018
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