ON VALIDATION OF A SAND WAVES AND SAND BANKS MODEL

S.J.M.H. Hulscher

Abstract


A morphological model is described for the interaction between tidal motion and an erodible bed. This model is able to distinguish between a flat bed, and the generation of tidal sand banks and/or sand waves, based on physical parameters. The physical meaning of the turbulence parameters Av and S, as used in this model is subject of discussion in the present paper, therefore a simpler system is investigated. A simple flow is described by a logarithmic profile model (a generally accepted turbulence model), as well as by a partial slip model, using Av and S. It is shown that the two models can be calibrated such that they produce the same bed shear stress, depth-averaged velocity and depth-averaged eddy viscosity. This leads to expressions for Av and S as function of the roughness height and a shape parameter in the logarithmic profile model. Application of this information to two locations shows that the bed form prediction model gives encouraging results.

Keywords


sand waves model; sand bank model; model validation

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