Flow over Triangular Elements Simulating Dunes

by Mahmoud Faisal Rifai, Consulting Engr.; Bonifica, Syria,
Kenneth V. H. Smith, (M.ASCE), Lect. in Civ. Engrg.; Southampton Univ., Southampton, England,

Serial Information: Journal of the Hydraulics Division, 1971, Vol. 97, Issue 7, Pg. 963-976

Document Type: Journal Paper


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.

Subject Headings: Alluvial channels | Flow simulation | Turbulent flow | River and stream beds | Channel flow | Turbulence | Dunes | Flumes

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