Toe-Scour Estimation in Stabilized Bendways
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Volume 122, Issue 8
Abstract
Minimum bed elevation in stabilized bendways is needed in the design of bank protection. Two empirical methods have been identified for scour-depth estimation that are consistent with available resources on a typical bank-protection project. The 1990 empirical method by Watanabe, Hasegawa, and Houjyou provided a good fit of the observed data used herein. Maximum depth in the bend is a function of R c /W, aspect ratio, channel slope, mean depth, and Darcy friction factor. An empirical scour-depth estimation method is developed herein and presented with a safety factor. Maximum depth in the bend is a function of R c /W, aspect ratio, and mean depth. The proposed scour-depth method should be limited to R c /W from 1.5 to 10 and W /D mnc from 20 to 125. Application to overbank flow conditions should be limited to overbank depth less than 20% of main-channel depth.
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Published In
Journal of Hydraulic Engineering
Volume 122 • Issue 8 • August 1996
Pages: 460 - 464
Copyright
Copyright © 1996 American Society of Civil Engineers.
History
Published online: Aug 1, 1996
Published in print: Aug 1996
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