TECHNICAL PAPERS
Mar 1, 1987
Do Critical Stresses for Incipient Motion and Erosion Really Exist?
Authors: J. William Lavelle and Harold O. MofjeldAuthor Affiliations
Publication: Journal of Hydraulic Engineering
Volume 113, Issue 3
Abstract
The concept of critical stress for the initial motion of noncohesive sediment beds under turbulent flow conditions is reviewed. Observational definitions of incipient motion are many and not entirely compatible. Some laboratory flume observations of sediment movement suggest that no true threshold exists. Current understanding of turbulent fluid motion at a sediment bed suggests that some particle movement must occur at all nonzero time‐mean velocities. A combined model for flume flow and sediment transport having no threshold is seen to explain features of data that have been previously used to support the threshold concept.
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Reference
1.
Please refer to the technical note, entitled “Bibliography on Sediment Threshold Velocity,” which immediately follows this paper in this issue of the journal. All notes in the text of this paper refer to the numbered references in the technical note.
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Published In
Journal of Hydraulic Engineering
Volume 113 • Issue 3 • March 1987
Pages: 370 - 385
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Copyright © 1987 ASCE.
History
Published online: Mar 1, 1987
Published in print: Mar 1987
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Authors
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J. William Lavelle
Research Oceanographer, Natl. Oceanic and Atmospheric Admin., Pacific Marine Environmental Lab., 7600 Sand Point Way N.E., Seattle, WA 98115‐0070
Harold O. Mofjeld
Research Oceanographer, Natl. Oceanic and Atmospheric Admin., Pacific Marine Environmental Lab., 7600 Sand Point Way N.E., Seattle, WA 98115‐0070
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