Abstract
Alternate bars on bed with non-uniform sediment are difficult to be approached to equilibrium state under some hydraulic conditions. It seems likely that sediment sorting is responsible for the instability of alternate bar bed geometry, because sediment sorting affects local sediment discharge resulting in difference bed geometry. In the present study, the mechanism of the spatiotemporal change of geometric and migration characteristics of alternate bar formed on bed with non-uniform sediment is discussed in terms of numerical analysis and linear bed stability analysis. The results support that alternate bars are difficult to be approached to equilibrium state because of coexist of the same-scaled complex migration velocities.
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