Role of suspended-sediment particle size in modifying velocity profiles in open channel flows
Role of suspended-sediment particle size in modifying velocity profiles in open channel flows
Previous experimental and analytical studies have revealed that suspended particles can attenuate or enhance turbulence, depending on the particle size in relation to turbulence scales. Incorporating this mechanism, an empirical turbulent eddy viscosity-based closure model is proposed for the mean velocity structure of suspended sediment-laden flow in open channels. The model integrates the sediment particle Stokes number, the ratio of particle-size-to-turbulence microscale, the ratio of particle settling velocity to bed shear velocity, and local sediment concentration. Its good performance is demonstrated in comparison with available laboratory observations. It is characterized that single-phase turbulence closure models can be adapted for sediment-laden flows by implementing sediment particle size effects.
1029
Cao, Z.
c541462a-b279-4c97-910d-69a6726c57c6
Egashira, S.
aa3ebd1c-e007-49e4-8324-e1bb5c74ebca
Carling, P.A.
8d252dd9-3c88-4803-81cc-c2ec4c6fa687
11 February 2003
Cao, Z.
c541462a-b279-4c97-910d-69a6726c57c6
Egashira, S.
aa3ebd1c-e007-49e4-8324-e1bb5c74ebca
Carling, P.A.
8d252dd9-3c88-4803-81cc-c2ec4c6fa687
Cao, Z., Egashira, S. and Carling, P.A.
(2003)
Role of suspended-sediment particle size in modifying velocity profiles in open channel flows.
Water Resources Research, 39 (2), .
(doi:10.1029/2001WR000934).
Abstract
Previous experimental and analytical studies have revealed that suspended particles can attenuate or enhance turbulence, depending on the particle size in relation to turbulence scales. Incorporating this mechanism, an empirical turbulent eddy viscosity-based closure model is proposed for the mean velocity structure of suspended sediment-laden flow in open channels. The model integrates the sediment particle Stokes number, the ratio of particle-size-to-turbulence microscale, the ratio of particle settling velocity to bed shear velocity, and local sediment concentration. Its good performance is demonstrated in comparison with available laboratory observations. It is characterized that single-phase turbulence closure models can be adapted for sediment-laden flows by implementing sediment particle size effects.
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Published date: 11 February 2003
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Local EPrints ID: 14710
URI: http://eprints.soton.ac.uk/id/eprint/14710
ISSN: 0043-1397
PURE UUID: ea866933-8224-4c66-a678-507993e4216d
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Date deposited: 24 Feb 2005
Last modified: 15 Mar 2024 05:30
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Author:
Z. Cao
Author:
S. Egashira
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