Sediment erosion in zero-mean-shear turbulence

Abstract : A stirring grid, in a square tank, located more than 2 mesh sizes away from a sediment layer, is used to study particle erosion by a zero-mean-shear turbulence. The particle concentration has been monitored using an OBS technique and fluid velocity mostly through PIV. Particle lift-off and concentration in the tank are shown to rise sharply as the grid frequency is increased. Converged velocity profiles indicate that the bulk isotropy of the turbulent velocity in the tank, well predicted by a slightly modified Matsunaga et al. (1999) model, gets broken close to the bed. While mean shear rates are shown to be small at the bed surface, some high shear level events induced by vortex impacts are assumed to be responsible for the particle erosion.
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Communication dans un congrès
Coastal Dynamics 2017, Jun 2017, Helsingør, Denmark. Proceedings of Coastal Dynamics 2017, pp.597-607
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https://hal.archives-ouvertes.fr/hal-01579186
Contributeur : Hervé Michallet <>
Soumis le : mercredi 30 août 2017 - 15:53:56
Dernière modification le : jeudi 3 janvier 2019 - 16:30:09

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  • HAL Id : hal-01579186, version 1

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Marie Rastello, Hervé Michallet, Jean-Louis Marié. Sediment erosion in zero-mean-shear turbulence. Coastal Dynamics 2017, Jun 2017, Helsingør, Denmark. Proceedings of Coastal Dynamics 2017, pp.597-607. 〈hal-01579186〉

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