Author(s): Tetsuro Tsujimoto
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Keywords: No Keywords
Abstract: Longitudinal stripes of sorting is closely interrelated to cellular secondary currents, and they promote or suppress each other through a feed-back system of flow and sediment transport. They determine a self-forming geometry of the cross section of a stream composed of sand and gravel. In this paper, a reasonable model of heterogeneous size material transport is prepared, and the interrelation between fractional bed-load transport and secondary currents are carefully described. In the analysis, a stream bed is assumed to be composed of two typical sizes, and the stripes are assumed to be composed of typically "rough” and "smooth” stripes. Based on the present modelling of heterogeneous material transport, a criterion of occurrence of longitudinal stripes due to alternate lateral sorting is clarified. Moreover, the spanwise distributions of composition of bed-surface layer and bed-load transport rate for equilibrium longitudinal stripes of sorting are also clarified.
Year: 1989