Mass, Energy, and Momentum Flux Analysis of a Bendway Weir
Publication: Journal of Hydraulic Engineering
Volume 143, Issue 9
Abstract
Bendway weirs are hydraulic control structures found in watercourses that range in scale from small streams to large rivers. They are designed to be submerged, broad-crested weirs, typically placed in groups on the outer bank of river bends. They are angled upstream, in order to redirect the flow that passes over them away from the bankline and toward the center of the channel. Although there exists a wealth of valuable guidance concerning best practices for bendway weir design, this guidance is derived mostly from engineering experience, and from physical and numerical model studies. To date, there exists no fundamental theoretical development of the mechanism by which bendway weirs function. Therefore, in order to provide this theoretical foundation, this paper presents a formal mass, energy, and momentum flux analysis of a bendway weir. The analysis yields a detailed description of the basic functionality of a bendway weir and suggests a means of reconciling the results from several extant modeling studies that appear to conflict. In addition, the paper provides design recommendations resulting from the analysis for both individual bendway weirs and for bendway weir groups.
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Acknowledgments
The author wishes to acknowledge the invaluable contributions of Mr. Tom Pokrefke and Mr. Dave Derrick, who are pioneers and educators in the use of bendway weirs in rivers and streams. The author also wishes to acknowledge the guidance and assistance of Dr. David Abraham, Mr. Ronnie Heath, and many other colleagues, who provided practical and historical context concerning the function and design of bendway weirs. This research was funded by the Mississippi River Geomorphology and Potomology Program (MRG&P) of the U.S. Army Corps of Engineers.
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Published In
Journal of Hydraulic Engineering
Volume 143 • Issue 9 • September 2017
Copyright
©2017 American Society of Civil Engineers.
History
Received: Jan 9, 2017
Accepted: Mar 24, 2017
Published online: Jun 26, 2017
Published in print: Sep 1, 2017
Discussion open until: Nov 26, 2017
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