Temporal Evolution of Clear-Water Scour Depth at Submerged Weirs
Publication: Journal of Hydraulic Engineering
Volume 146, Issue 3
Abstract
Equilibrium clear-water scour depths predicted by existing equations based on the peak flow rate of a flood hydrograph can be overly conservative for submerged weirs in mild-slope sandy rivers, because the equilibrium timescale normally is much larger than the timescale of a flood event. Therefore it is important to understand the clear-water scour development at submerged weirs in order to improve the accuracy of scour estimation. This paper presents new data on the temporal evolution of the downstream clear-water scour depth at a submerged weir under steady flow conditions and analyzed the impacts of flow intensity, weir height, sand coarseness parameter, and weir slope on the development of the downstream clear-water scour depth. This study defined a dimensionless equilibrium time scale and evaluated its dependencies on the aforementioned parameters. Predictors for and the temporal downstream clear-water scour depth at submerged weirs are proposed.
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Data Availability Statement
Some or all data, models, or code generated or used during the study are available from the corresponding author by request (MTA data, MTA data process code, and webcam videos).
Acknowledgments
The authors acknowledge the valuable suggestions from Graham Macky and the constructive comments from editors and reviewers. The first author thanks the China Scholarship Council for financial support of this research. This research was supported by the Young Scientist Fund of the National Natural Science Foundation of China (51709082).
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Information & Authors
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Published In
Journal of Hydraulic Engineering
Volume 146 • Issue 3 • March 2020
Copyright
©2020 American Society of Civil Engineers.
History
Received: May 28, 2018
Accepted: Aug 27, 2019
Published online: Jan 10, 2020
Published in print: Mar 1, 2020
Discussion open until: Jun 10, 2020
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