Performance of compound submerged vanes in sediment control at 90o lateral intake

Sediment control at 90º diversion using compound submerged vanes is experimentally studied. The compound submerged vanes are considered from joint of bottom and surface vanes as a new idea in this study. A total of 52 experiments are carried out in a flume with 17m length، 100 cm width and 90 0 diversion angle with 2. 53m length، 40 cm width in the hydraulic laboratory using a non-tilting flume. Sediment control at intake entrance is examined with different flow discharges and intake ratios using bottom submerged vanes in parallel arrangement and compound submerged vanes with three surface vane heights. Compound submerged vanes with CH=0. 5 (surface vane height parameter) among different cases of compound submerged vanes، has shown the best performance in sediment control at lateral intake. The case with CH=0. 5 in 8 percent intake ratio، eliminates sediment entrance into intake and also in 16 percent intake ratio shows the best performance among other cases. Compound submerged vanes can decrease sediment entrance to intake as parallel submerged vanes therefore it shows the feasibility of some promises for the further developments.