Effect of Submerged Vanes on Intake Ratio of Lateral Intakes

 Submerged vanes are commonly used as hydraulic structures for sediment control at intake entrance. In the present research which was undertaken at the Hydraulic Laboratory in Water Engineering Department of Shiraz University, the hydraulic performance of these structures in sub-critical flows was studied experimentally, and the effects of submerged vanes, angle variations of submerged vanes and discharge rates on intake ratio and water surface profiles in the main channel near the lateral intake with rounded entrance and angle of 55 degree which is named as the best intake angle were investigated. In this study the submerged vanes had four installation angles of 10, 20, 30 and 40 degrees along with the two setups of 2 and 3 parallel vanes across the entrance, considering four levels of discharge values. The results showed that the application of submerged vanes, regardless of their angles, caused in the increase of water surface elevation near the upstream of the vanes as compared to the no vanes condition. The submerged vane cause an increase in intake ratio. Finally the results showed that the submerged vanes with angle of 30 degree and three parallel vane setup across the entrance had the best intake efficiency.