Abstract
A quasi-3D model for suspended sediment transport based on an asymptotic solution of the convection-diffusion equation is developed for currents and waves. The influence of waves on the sediment concentration is included through the diffusion analogy and the boundary condition near the bed. The flow velocity profile is assumed to have a logarithmic shape. An extensive sensitivity analysis concerning the influence of wave and current parameters on the suspended adjustment phenomenon shows that the presence of waves considerably enlarges the suspended load and its adjustment time and length scales. Validity analysis of the quasi-3D formulation results in restrictions for the suspension parameter (modified for waves) and for the time and length scales of changes in hydraulic conditions. The presence of waves eases all the above restrictions and thus enlarges the validity area of the model considerably. The model is compared with 2DV and 3D numerical solutions of the convection-diffusion equation with good agreement and verified with existing measurements.
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