NUMERICAL SIMULATION ON LOCAL SCOURING AROUND A SPUR DIKE USING EQUILIBRIUM AND NON-EQUILIBRIUM SEDIMENT TRANSPORT MODELS

Around a spur dike, local scouring is occurred and it is necessary to estimate the maximum scour depth and the bed elevations around the dike. In this paper local scouring around the dike is simulated using the equilibrium and non-equilibrium sediment transport models. To evaluate the model performance, both calculated results are compared with experiments conducted by Michiue & Hinokidani (1992) and the scouring processes and the flow near bed, especially in the initial stage, are examined. It was shown that the time scale of maximum scour depth and scouring processes are different between the equilibrium and non-equilibrium sediment transport models.