The Effect of Relative Discharge on Local Scour Downstream Combined Structure [ ]

In this research, a study was conducted experimentally to investigate the scour hole dimen-sions downstream the combined structures which consist from weir and gate due to the effect of the relative dis-charge (Qr) between the flow above the compound weir to the flow under the gate. Twenty models have been de-signed, and every model is formed from composite weir consists of two geometric shapes with rectangular gate of constant dimensions.