Boundary Shear Stress Distribution in Curved Compound Open Channels
Publication: Journal of Hydraulic Engineering
Volume 147, Issue 2
Abstract
An analytical model for evaluation of boundary shear stress in compound open-channel bends is developed. Perpendicular volumetric elements are generated in all cross sections of a bend. Each element represents an equation with two parameters, including the secondary current parameter and momentum transfer coefficient, accounting for acceleration and internal forces. For each cross section with elements, equations with unknowns of streamwise depth-averaged velocity are derived. The boundary shear stress distribution is then calculated using the Darcy-Weisbach relationship. The momentum transfer coefficient is related to the geometric characteristics of the channel cross section and the bend. The present results were compared with the experimental data available in the literature. The experimental models have trapezoidal and rectangular main channels with both curved and straight paths. The results seem to be acceptable except at the interface of the main channel and floodplains, because of the planform vortices. Overall, the total results are satisfactory, and the present analytical model can be used to predict the boundary shear stress in simple and compound channels.
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Data Availability Statement
Some or all data, models, or code generated or used during the study are available in a repository online in accordance with funder data retention policies (http://theses.gla.ac.uk/74427/, DOI: https://doi.org/10.1017/S0022112098002869 and https://dspace.lboro.ac.uk/dspace/handle/2134/6825). Some or all data, models, or code generated or used during the study are available from the corresponding author by request (including codes and numerical results).
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Journal of Hydraulic Engineering
Volume 147 • Issue 2 • February 2021
Copyright
© 2020 American Society of Civil Engineers.
History
Received: Sep 20, 2019
Accepted: Sep 9, 2020
Published online: Dec 15, 2020
Published in print: Feb 1, 2021
Discussion open until: May 15, 2021
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