Discharge Coefficients for Rectangular Broad-Crested Gabion Weirs: Experimental Study
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VIEW THE REPLYPublication: Journal of Irrigation and Drainage Engineering
Volume 147, Issue 3
Abstract
Weirs are commonly used for making discharge measurements in irrigation canals. There are several types of weirs that are categorized based on their geometric shape or hydraulic properties. A gabion weir is a porous weir that can pass flow through its body in addition to the flow that passes over the weir. This study focuses on determining the discharge coefficients () for rectangular broad-crested gabion weirs using fabricated physical models. Dimensional analysis was carried out for finding the most effective parameters that govern the flow. Results show that the of gabion weirs is 10.5% greater than that of similar solid weirs. In addition, the for porous weirs in free flow conditions is 17.2% greater than that for submerged flow. For (where is the water depth over the weir crest and is the weir length) a porous weir acts similar to a solid weir and the effect of porosity () nearly vanishes. For a specified value of , the ratio of submergence () for a solid weir is higher than that for porous weirs. Porous weirs with 50% porosity have lower values of compared with solid weirs and weirs with lower porosities, of 45%, 41%, and 30%. Regression equations for the flow through gabion weirs were generated for free and submerged flow conditions. The derivations of equations were carried out using multivariable nonlinear regression and genetic programming (GP). Finally, a comparison of in the present study with the other studies was carried out.
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Data Availability Statement
Some or all data, models, or code that support the findings of this study are available from the corresponding author upon reasonable request.
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Published In
Journal of Irrigation and Drainage Engineering
Volume 147 • Issue 3 • March 2021
Copyright
© 2021 American Society of Civil Engineers.
History
Received: Apr 17, 2020
Accepted: Sep 28, 2020
Published online: Jan 6, 2021
Published in print: Mar 1, 2021
Discussion open until: Jun 6, 2021
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