Temporal Development of Scour Holes around Submerged Stream Deflectors
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Volume 137, Issue 7
Abstract
Deflector structures used in many fish habitat rehabilitation schemes are frequently overtopped, yet few studies have examined the scour patterns created around submerged models. Furthermore, laboratory studies typically test smooth-surfaced structures, whereas those installed in natural rivers are generally made of logs or boulders. This study uses rough-surfaced paired deflectors to investigate the temporal evolution of scour for three overtopping ratios in identical approach flow conditions in a flume. Results show that maintaining identical discharge and raising the deflector height, which reduces the overtopping ratio (i.e., flow depth divided by structure height), generates increased depth and volume of scour next to the structures. The location of maximum depth and the rate of scouring with time is similar for the two highest deflectors (overtopping ratios of 1.22 and 1.83), but different for the lowest deflector model (overtopping ratio of 3.67). To improve the success rate of river restoration projects using in-stream structures, the overtopping ratio should be considered in equations that predict the scour depth evolution with time.
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Acknowledgments
This research was funded by a Natural Sciences and Engineering Research Council of Canada (NSERC) NSERCDiscovery Grant (Biron). Thanks to Susan Gaskin for granting access to the Civil Engineering Hydraulics Laboratory flume and to John Bartczak for his invaluable help in the lab. Comments from three anonymous reviewers, the associate editor, and the editor on a previous version greatly helped improve this paper.
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Published In
Journal of Hydraulic Engineering
Volume 137 • Issue 7 • July 2011
Pages: 781 - 785
Copyright
© 2011 American Society of Civil Engineers.
History
Received: May 20, 2010
Accepted: Oct 19, 2010
Published online: Dec 20, 2010
Published in print: Jul 1, 2011
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