Abstract
Real fluvial system is non-uniform and unsteady, therefore, the nonequilibrium sediment transport model should be developed in a spaceand-time plane, in order to describe the real fluvial phenomena precisely. In this study, the convolution integral formed sediment transport model is developed along a temporal axis. The sediment pick-up rate, which is one of the fundamental parameters of the model, is estimated by means of a numerical simulation of incipient rolling motion, with particular reference to the effects of flow unsteadiness. The result of the simulation is compared with the experimental data of sediment particles' motion in an oscillation-current coexisting field to confirm the applicability of the method proposed.
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