Research Article
Sep 1982
Stability of Armour Layers in Rivers
Authors: Arved J. Raudkivi and Robert EttemaAuthor Affiliations
Publication: Journal of the Hydraulics Division
Volume 108, Issue 9
Abstract
The importance of both the overpassing and the embedding of river bed particles is demonstrated by experiments. When a single layer thick armouring layer of uniform d1 size particles on a bed of uniform finer d2 size particles is broken at one location the stability of the remainder of the armour layer depends on the tendency of the d1 particles to embed into the surface of d2 particles. If a d1 size particle is seated in the exposed position on the surface of the d2 sized bed sediment it may, by virtue of its exposure to the flow, be preferentially entrained and it may then overpass the finer bed sediment. Alternatively, the d1 particle may be too large for overpassing and it will become embedded. Armour layers composed of particles which embed, tend to be more stable.
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Published In
Journal of the Hydraulics Division
Volume 108 • Issue 9 • September 1982
Pages: 1047 - 1057
Copyright
© 1982 American Society of Civil Engineers.
History
Published in print: Sep 1982
Published online: Feb 3, 2021
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Authors
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Arved J. Raudkivi
Prof., Dept. of Civ. Engrg., Univ. of Auckland, Auckland, New Zealand
Robert Ettema
Research Engr., Iowa Inst. of Hydr. Research, Iowa City, Iowa 52242; Formerly Post-graduate Student, Univ. of Auckland, Auckland, New Zealand
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