Research Article
Jul 1971
Flow over Triangular Elements Simulating Dunes
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VIEW THE REPLYPublication: Journal of the Hydraulics Division
Volume 97, Issue 7
Abstract
A series of rigid triangular elements, placed on the bed of a laboratory flume, were used to simulate alluvial channel bed features which are large relative to the depth of flow. The study shows that the frequency of the turbulence throughout the flow is higher than that for comparable flow over a rigid plane bed, due to the higher frequency turbulence arising from the eddies in the lee of the elements. The macroscale of turbulence is approximately equal to the height of a triangular element, whereas in plane bed flow the macroscale is approximately equal to the depth of flow. Large variations in the average value of the von Kármán constant occurred for different positions along the length of a triangular element, and these are shown to be comparable with variations observed in dune-bed alluvial channel flow.
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Published In
Journal of the Hydraulics Division
Volume 97 • Issue 7 • July 1971
Pages: 963 - 976
Copyright
© 1971 American Society of Civil Engineers.
History
Published in print: Jul 1971
Published online: Feb 3, 2021
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Authors
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Mahmoud Faisal Rifai
Consulting Engr., Bonifica, Syria
Kenneth V. H. Smith, M.ASCE
Lect. in Civ. Engrg., Southampton Univ., Southampton, England, U.K.
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