Abstract: In order to realize the simulation analysis of suspended sediment motion process， single-fluid model combined k－ε turbulence equation and suspended sediment transport equation was solved by finite volume method. Numerical simulation on two experimental cases was performed and the calculation results agreed well with two experiment results， verifying the effectiveness of the single-fluid model. Then， numerical simulations on suspended sediment up and down motion process in the two experiments were performed. The results showed that sediment run 24s and 35s from the beginning up to a steady state and from the beginning down to a steady state respectively. It is indicated that the single-fluid model is effective to simulate motion process of suspended sediment. It can provide a scientific reference and basis for the study of water and sediment in river coastal engineering.

Key words: suspended sediment, single-fluid model, finite volume method, motion process, numerical simulation