A common assumption in modelling tidal flow in coastal areas is that in the vicinity of the bottom the vertical flow profile attains a logarithmic shape. Some consequences of this type of assumption are studied in the present paper. In a diagnostic setting, the tide-residual transport of sediment is depicted as a function of the thickness of the assumed log-layer. In this respect, the tide is schematised to a combination of the M2 and M4 constituents and the water depth is chosen in a range typical for the shoreface (10-25m). The computational results indicate that assuming a log-layer may lead to an error in the crossshore transport in the order of 1% of the alongshore transport.
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