Current crescent scour marks can be explained as effects of the stretching and accumulation of the vorticity in flow approaching an obstacle, the fluid-mechanical aspects of vorticity transport being described in some detail. The observed differences between the scour-remnant ridges and scour-deposited ridges may be explained in terms of differences in flow configuration geometry. Sediment transport depends not only on the range of values of fluid vorticity but also upon the sequence in which the values in the range are obtained. This aspect of transport phenomena is emphasized and it is suggested that experiments should be performed to determine the sensitivity of the functionals to the flow functions.

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