Abstract

The wave height of alternate bars formed on non-uniform sediment bed is smaller than that on uniform sediment bed. Longitudinal and transverse sediment sortings are responsible for such a difference. Hydraulic jump forms at downstream area of bar crest depending on hydraulic conditions, and may govern bed shear stress distribution. Coarser grains tend to deposit at very downstream of bar crest and are devoted to the wave migration. Finer grains are transported from the crests to downstream area and tend to deposit in the troughs where the bed shear stress is smaller. Such sediment sortings are supposed to suppress the wave height of alternate bars.

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