Effects of Bed Load and Suspended Load on Separation of Sands and Fines in Mixed Sediment

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. Th...

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Bibliographic Details
Published in:Journal of waterway, port, coastal, and ocean engineering port, coastal, and ocean engineering, 2010-11, Vol.136 (6), p.319-326
Main Authors: Jepsen, Richard, Roberts, Jesse, Gailani, Joseph
Format: Article
Language:English
Subjects:
Adjustable
Aggregates
Channels
Erosion rate
Flumes
Marine
Sands
Sediments
TECHNICAL PAPERS
Transport
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Summary: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 1,250 μm . 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.
ISSN:0733-950X
1943-5460
DOI:10.1061/(ASCE)WW.1943-5460.0000054