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Bagnold's bedload equation in the form q alpha (u - u cr ) 3 has frequently been employed to predict sediment mass transport rates in tidal flows and to assist with the interpretation of ancient tidal deposits. However physical considerations suggest that the form q alpha (u 2 - u 2cr )u is more correct. This latter formulation is therefore calibrated with experimental data, and the coefficient of proportionality is shown to be strongly dependent on the sediment grain size.--Journal abstract.
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