Study on Characteristics of Water Flow Under Different Riverbed Structures in River Narrowing Section

In this paper, a numerical simulation research on the flow characteristics of dammed river under four kinds of riverbed structures is studied by using the turbulence model and the VOF model. The results show that: ① Due to the influence of the riverbed structure, the water flow vortex area of different riverbed structures is obviously different. The backwater and the reflux are the most obvious in a simulated bucket basin model of step-pool structure. ② The average velocity of the section of the bucket basin riverbed and the clustered riverbed is small, and the steady flow velocity is not large. Combined with the base pressure distribution of the riverbed, the pressure distribution of the bucket basin riverbed and ribbed riverbed is relatively regular. This shows that the bucket basin structure is of great help to improve the stability of riverbed. ③ The bucket basin model has better effect of energy dissipation than the other three types.