Experimental Investigation of the Effect of Inclined Main Channel Wall on the Amount of Delivered Sediment into the Lateral Intake with/without Submerged Vanes

Sediment control is one of the most important issues in hydraulic structures designing. Many attempts have been carried out to reduce the amount of sediment entrance to the intakes. The amount of delivered sediment into the lateral intake depends mainly on the flow pattern in the head of the intake. Therefore, changing the main channel wall slope may change the flow pattern and consequently amount of delivered sediment into the intake. In this experimental study, in order to investigate the effect of inclined main channel wall on the amount of delivered sediment into the lateral intake, a series of experiments were carried out for both vertical and inclined (z=1.5) main channel wall. Also, the effect of submerged vanes in the both channel wall types, was studied. Dimensional relations and variables were developed using non-dimensional analysis. Results showed that inclining the main channel wall causes decreasing bed load sediment entrance into the lateral intake. Furtheremore, submerged vanes in both vertical and inclined main channel wall decrease sediment entrance into the lateral intake but reduction of sediment entrance in inclined wall especially in low diversion ratio is more than the vertical wall. For example, in the case of inclined wall with submerged vanes for 12% diversion ratio, 100% of sediment reduction was obtained compared to the vertical wall.