Lateral Variations in Suspended Sediment Concentration over Dunes
Publication: Journal of Hydraulic Engineering
Volume 132, Issue 12
Abstract
A series of laboratory flume experiments were conducted to characterize lateral variations of suspended sediment over dunes. Forty experimental runs were made using flow depths of 0.328 and in a -wide channel. The Froude number was 0.47 and the median diameter of the bed material was . Point samples of suspended sediment and depth-integrated values calculated using acoustic backscatter data were collected simultaneously at two lateral positions at spacings of 0.41, 0.20, 0.10, and . Root mean square differences between the paired samples increased from 30 to 94% and from 20 to 45% of the mean concentration for point samples and depth-integrated samples, respectively, as the lateral spacing between samples was increased. Lateral variations in the concentration of suspended sediment should be considered when designing sediment sampling strategies over dune beds.
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Acknowledgments
The experiments could not have been conducted without the assistance of John Cox. Jason Cabell, Charles Hardin Jr., and Kim Dodez who helped collect and analyze suspended sediment samples. Doug Shields, Jim Chambers, and Brian Barkdoll provided reviews which improved the quality of this paper.
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© 2006 ASCE.
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Received: Aug 31, 2004
Accepted: May 16, 2006
Published online: Dec 1, 2006
Published in print: Dec 2006
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