Effects of Bed Load and Suspended Load on Separation of Sands and Fines in Mixed Sediment
Publication: Journal of Waterway, Port, Coastal, and Ocean Engineering
Volume 136, Issue 6
Abstract
An adjustable shear stress straight flume commonly used to measure cohesive sediment erosion rates has been modified to include downstream bed load traps. The new flume can be used not only to measure erosion rates, but also to analyze and quantify the modes of transport for this complex problem. The new device was used to study transport modes of quartz particles ranging in size from 19 to . As expected, the traps captured the coarse material (bed load) and the fine material bypassed the traps (suspended load). Transport properties of natural sediments from three locations were also studied. Fine sediments with little or no sand eroded as aggregates which maintained their integrity in the flume channel while moving as bed load into the traps. Natural sediments that included high percentage of sand also eroded as aggregates. However, these aggregates quickly disaggregated. Sand moved as bed load and fell into the traps while fine particles moved predominately in suspension.
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Acknowledgments
This research was supported by the Dredging Operations and Environmental Research Program of the U.S. Army Corps of Engineers Engineering Research and Development Center. Permission to publish was granted by the office, Chief of Engineers, U.S. Army Corps of Engineers. Sandia National Laboratories is a multiprogram laboratory operated by Sandia Corporation, a Lockheed Martin Company for the United States Department of Energy's National Nuclear Security Administration under Contract No. DOEDE-AC04-94AL85000.
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Information
Published In
Journal of Waterway, Port, Coastal, and Ocean Engineering
Volume 136 • Issue 6 • November 2010
Pages: 319 - 326
Copyright
© 2010 ASCE.
History
Received: Nov 3, 2008
Accepted: Mar 4, 2010
Published online: Mar 6, 2010
Published in print: Nov 2010
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