Experimental Investigation of Scouring in Downstream of Combined flow over Weirs and below Gates

摘要

Some of the weir's disadvantages can be solved if they combined with sluice gates. One disadvantage of the sluice gates is they retained the floating materials which can be solved if they combined with the weirs. Such a flow, which often appears in form of jets, may have considerable hydraulic potential to scour on the downstream side of the structure; a scour hole is formed. Since the scour hole develops rather rapidly, the researchers take interest in the equilibrium scour depth, h_s and the length of scour hole, L_s. In this study, the scour characteristics of scour hole downstream of combined free over weir and below gate was investigated experimentally. The results show by decreasing the y/a and w/a (y is the gate opening, w is the head over weir and a is the vertical distance between the gate top and the weir bottom), the ratio of hs/y0 increases and the hs/yo is greatest when w/a=6.