Title

Vortex mechanisms of local scour at model fishrocks

Authors

R T. Cullen

Publication Date

1991

Notes

ISBN 0-913235-72-5

Publication Title

Fisheries Bioengineering Symposium: American Fisheries Society Symposium 10

Start Page

213

End Page

218

Editors

Colt J;White RJ;

Publication Place

Bethesda, MD

Publisher

American Fisheries Society

Abstract

In a laboratory flume, geometrically different model fishrocks were used to induce scour. Fishrocks are defined as boulders placed in streams to improve fish habitat. Fishrocks create scoured areas in streams by increasing local water velocities near the substrate, which increase the local drag and lift forces that act on the substrate grains. Vortices act as the mechanism of local scour. The complexity of the local scour phenomenon arises from the hydraulic interaction among water flow, large roughness elements, vortices, and a deformable substrate.

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