Critical Bed-Shear Stress for Cohesive Sediment Deposition under Steady Flows
Publication: Journal of Hydraulic Engineering
Volume 134, Issue 12
Abstract
Results of two laboratory experiments on the cohesive sediment deposition behavior are presented. Data indicate that an annular flume, either with or without the channel bed and the top ring rotating in opposite directions to minimize the secondary circulation, can be used to study the deposition behavior of cohesive sediments. Direct observations on when and where the bed is formed suggest that deposition only occurs when the local bed-shear stress is less than a critical value. Secondary circulation in the flume, which produced upward current near the inner corner and downward current near the outer corner, did not prevent deposition near the inner corner (because of the small ) nor promote deposition near the outer corner (because of the relatively large ).
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Acknowledgments
Sincere appreciation goes to Dr. Onyx Wai at Hong Kong Polytechnic University for providing the mud and for helpful discussions. Great comments and help from anonymous reviewers are also sincerely acknowledged.
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Information
Published In
Journal of Hydraulic Engineering
Volume 134 • Issue 12 • December 2008
Pages: 1767 - 1771
Copyright
© 2008 ASCE.
History
Received: Apr 3, 2007
Accepted: Mar 3, 2008
Published online: Dec 1, 2008
Published in print: Dec 2008
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