Abstract
Although a suspended-load phenomenon has been treated as turbulent diffusion, the phenomenon should be mainly considered as convective dispersion by the external forces due to gravity and random turbulent fluctuation. Based on this concept, the new theory on suspended-load is developed, that is, the coefficient of diffusion and the distribution of concentration are analyzed by the aid of the newly constructed simulation model, which is based on the dynamic equation of particle motion and verified by the experimental data. The characteristics of its motion are studied by the newly developed theory and some of the problems which are not clearly explained by the existing theories can be solved.
