Local scour profiles downstream of adverse stilling basins

In this paper, scour proles downstream of adverse stilling basins, due to the submerged jet issuing from a sluice gate, were investigated. Experiments were conducted in a wide range of sediment sizes, incoming ow Froude numbers, tailwater depths, length and slope of the stilling basin. The results showed that the scour proles at any bed slope are similar in shape. However, the longitude evolution of scour proles and the volume of eroded materials increased in accordance with the slope of the basin. It was observed that the maximum depth of the scour hole occurs in the vicinity of the side walls and slightly decreases towards the centerline. A polynomial equation was derived to describe the nondimensional scour proles at dierent slopes. Based on experimental data, the scour characteristics have been correlated with the time of equilibrium stage by developing some empirical relationships. Finally, a power-law equation was derived and fully dened to include the dimensions of the scour hole time scale and the geometry of the sluice gate.