Author(s): Tetsuro Tsujimoto
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Keywords: No Keywords
Abstract: The flow with vegetation zone is associated with organized fluctuation, which is constituted by alternation of lateral component of flow vegetation at the velocity boundarywith low frequency and its amplitude is still intense even near the bottom. Hence it influences even bed-load motion or it brings about alternation of lateral flux of bed-load transport. Since the bed-load intensity in the main course is obviously higher than that in the vegetated zone, the net flux of lateral bed-load transport is toward the vegetated zone and the sediment deposits there to make a longitudinal sand ridge. When the bed is composed of graded materials, the process accompanies lateral sorting to form a longitudinal stripe of fine sediment. The lateral gradient of the total of fractional transport rates contributes to sand ridge formation while that of the difference among them contributes to sorting. Such a process is described by the non-equilibrium bed-load transport model for each grain size.
Year: 1997