Author(s): M. H. Omid; A. R. Habibzadeh; H. Nozari
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Keywords: Sluice gate; Discharge coefficient; Sediment laden flow d =
Abstract: The effect of sediment laden flow on discharge coefficient of a vertical sluice gate was experimentally investigated. Flow was introduced to a rectangular stilling basin of 3m long and 0. 5m wide. Sand and gravel particles with uniform diameters of 1. 44 to 8. 73mm were in the experiments. The results show that the presence of sediment in the flow under a sluice gate reduces the discharge coefficient and increases the flow depth at the upstream of the gate. The decrease in discharge coefficient was found to be dependent on the particle diameter and the injection rate of sediment. This is due to reduction in cross section area and loss of velocity head under the gate. Contraction and velocity coefficient are both reduced and as a result a reduction is occurring to the discharge coefficient. Introducing a reduction coefficient called sediment coefficient, a relationship is presented to evaluate this coefficient based on sediment size and concentration.
Year: 2007