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A model for sand waves generation
Blondeaux, P.; Brocchini, M.; Vittori, G. (2000). A model for sand waves generation, in: Trentesaux, A. et al. Marine Sandwave Dynamics, International Workshop, March 23-24 2000, University of Lille 1, France. Proceedings.
In: Trentesaux, A.; Garlan, T. (Ed.) (2000). Marine Sandwave Dynamics, International Workshop, March 23-24 2000, University of Lille 1, France. Proceedings. Université de Lille 1: Lille. ISBN 2-11-088263-8. 240 pp., more
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Keyword
    Marine/Coastal
Authors  Top 
  • Blondeaux, P.
  • Brocchini, M.
  • Vittori, G.
Abstract
    A three-dimensional model for the generation and evolution of sand waves from bottom perturbations of a flat seabed subject to the action of tidal currents and wind waves is proposed. A horizontally-two-dimensional basic flow comprehensive of Coriolis effects, forced by the local climate (tides, residual currents and waves), is considered. Thie flow is completely resolved also in the vertical direction from the free surface down to the seabed. The flow regime is assumed to be turbulent and a Boussinesq's approach based on a space-dependent eddy viscosity is adopted to model Reynolds stresses. Sediment transport is modelled in terms of both suspended load and bed load. The model is capable of predicting the conditions leading to the appearence of sand waves and to determine their main characteristics (wavelength, orientation and migration speed).
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