Peculiar mean velocity profiles within a porous bed of an open channel

We present the velocity profile measured within a porous bed below rough turbulent open channel flow. Mean streamwise velocity has a minimum in the top pore, just below the bed surface, and then increases towards a constant value in the deeper pores. We argue that the velocity minimum in the top por...

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Bibliographic Details
Published in:Physics of fluids (1994) 2007-09, Vol.19 (9), p.098109-098109-4
Main Authors: Pokrajac, D., Manes, C., McEwan, I.
Format: Article
Language:English
Subjects:
Applied fluid mechanics
Exact sciences and technology
Fluid dynamics
Fundamental areas of phenomenology (including applications)
Hydrodynamics, hydraulics, hydrostatics
Instrumentation for fluid dynamics
Physics
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Summary:We present the velocity profile measured within a porous bed below rough turbulent open channel flow. Mean streamwise velocity has a minimum in the top pore, just below the bed surface, and then increases towards a constant value in the deeper pores. We argue that the velocity minimum in the top pore is due to enhanced turbulence generated within the external flow. This produces a flow regime similar to rough turbulent pipe flow, with very efficient momentum extraction. In the deeper pores turbulence intensities are damped so that momentum extraction is less efficient, allowing higher mean velocities to develop.
ISSN:1070-6631
1089-7666
DOI:10.1063/1.2780193