Abstract

Antidune-like bedforms in the alluvium of the gravel-bedded North Saskatchewan River, Alberta, form regular trains of gravel mounds. Crest lengths, transverse to the flow, are about 2 meters, and crest spacing, along the flow, is between 2 and 3 meters. Flume experiments with gravel beds show that published equations describing flow conditions for the formation of antidunes on sand beds are applicable to antidune formation on gravel beds. Paleohydraulic reconstructions based on antidunes give rough estimates for depth and velocity, but cannot be used to estimate bedslope. Comparison of slope estimates based on antidune dimensions and observed bedslopes show the inadequacies of such estimates.

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