Numerical simulation on local scouring around a spur dike using various turbulence and sediment transport models

摘要

Local scouring tends to occur around spur dikes. Therefore, it is important to estimate not only the maximum scour depth, but also the bed geometry around them. In this study, local scouring around a dike was simulated by means of various turbulence and sediment transport models. The standard and non-linear k-e models were adopted as the turbulence model, with equilibrium and non-equilibrium sediment transport models. To evaluate the performance of the model, calculated results were compared with the results of experiments conducted by Michiue and Hinokidani (18); and the applicability of all these models was assessed by examining the temporal variation of the flow near the bed and the variation of the bed level. A comparison was made between the equilibrium and non-equilibrium sediment transport models. It revealed that the temporal variation of the bed elevation in the initial scouring process and the bed geometry in the equilibrium stage were different.