Research Article
Mar 1970
Initial Instability of Fine Bed Sand
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VIEW THE REPLYPublication: Journal of the Hydraulics Division
Volume 96, Issue 3
Abstract
The initial entrainment characteristics of fine bed sand are objectively defined in terms of the measured distributions of critical instantaneous bed shear stress associated with the observed movement of individual surface grains. Critical flow conditions are then predicted by equating the lower extremes in these characteristic critical shear stress distributions to the upper extremes in the distribution of instantaneous bed shear stress produced by the particular type of background flow under consideration. The method is applied to the case of two-dimensional channel flow over a flat bed and yields sufficiently consistent results to suggest an extension to Shields' curve for small grain Reynolds numbers. The detailed experimental observations clearly illustrate the important role played by bed region turbulence in the interaction process between the fluid and the mobile bed grains constituting the deformable boundary.
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Published In
Journal of the Hydraulics Division
Volume 96 • Issue 3 • March 1970
Pages: 619 - 632
Copyright
© 1970 American Society of Civil Engineers.
History
Published in print: Mar 1970
Published online: Feb 3, 2021
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Authors
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Anthony J. Grass
Lectuer; Dept. of Civ. Engrg., Univ. Coll., London, England
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