Laboratory Study For Estimating The Removing Sediment From Upstream Weirs Using Bottom Outlets

Abstract

In this research, a series of laboratory experiments were carried out to estimatethe removing sediment amount from upstream weirs using bottom outlets. Theexperiments were conducted in a laboratory channel (24.6 m) in length and (0.81 m)wide, in middle of which a weir was fixed. Six discharges were allowed to flow with,three different sediment concentration for each. The results showed that there is a directrelation between the area of the holes, Froude number and the amount of sedimentremoved, the depth of aggradation near weir location decreases with increasing thenumber of holes. A dimensionless equation was created to compute the amount ofsediment removed in terms of area of the holes with a coefficient of determination(0.895) and the percentage of the highest and lowest difference between the measuredand calculated sediment amount were (15.7, 0.2), respectively.