Local Scour at Downstream Sloped Submerged Weirs

AbstractThis paper presents an experimental study of local scour at submerged weirs with different downstream slopes. Thirty-three tests of coarse sand (d50=0.85 mm) and 24 tests of fine sand (d50=0.26 mm) were carried out in a sand-recirculating flume. The tests for each sand type used four weirs with different downstream weir slopes (π/6, π/4, π/3, and π/2 to horizontal for the fine sand; π/12, π/6, π/4, and π/2 to horizontal for the coarse sand). The results show that the upstream scour depth is independent of the downstream weir slope β. For both sand types, the downstream weir slope has no effect on the downstream scour depth when it is greater than the upstream slope of the downstream scour hole θ. For β