Flow resistance in rivers changes with development or attenuation of sand waves. Therefore, it is necessary to know how the flow resistance varies with transformation of sand bed in order to predict the water surface profiles. In this study, the numerical model to reproduce the formation processes of dunes and flow resistance was developed. A depth averaged flow model considering the effects of vertical acceleration and a non-equilibrium sediment transport model are combined. The calculated results on the temporal development processes of dunes, the shape characteristics and flow resistance are compared with previous experimental and theoretical studies.
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