Author(s): P. K. Stansby
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Keywords: No Keywords
Abstract: Sediment dispersion is modelled using a semi-implicit finite-volume scheme for the diffusion-advection equation. Accurate prediction of the settling of dredged spoil is the main motivation. The simplified hydrodynamics of parallel oscillatory tidal flow are assumed locally employing k -ε turbulence modelling with wall functions. The mesh spacing in the vertical direction varies parabolically to give fine resolution near the bed and free surface. In the diffusion-advection equation for concentration c vertical diffusion terms are handled implicitly, horizontal-diffusion explicitly and source terms semi-implicitly or explicitly and advection terms explicitly with upwind interpolation. The latter is a problematic issue and a third- order accurate flux-limited scheme is shown to be effective.
Year: 1997