REDUCTION OF SEDIMENT TRANSPORT DUE TO FLOOD AND RUNOFF TO A LATERAL INTAKE IN THE RIVER BEND USING SUBMERGED VANE

摘要

Sediments can enter and obstruct intakes and greatly accelerate abrasion of hydraulic machinery, thereby decreasing its efficiency and increasing maintenance costs. So, sediment management in river and waterways has been an important issue for water managers throughout history. The submerged vane technique is a new and efficient method with positive environmental effects for sediment control in rivers. The present work was conducted to investigate the function of submerged vanes in managing the reduction of sediment transport to the lateral intake in an 180° bend. Results showed that the performance of parallel submerged vanes in diverting the sediment movement path depending on the qr and the angle of collision of the vane with the flow. Moreover, it was found that qr has a direct relationship with the sediment flowing into the intake; i.e., with its increase in all installation angles, the ratio of sediments entering the intake increases. The efficiency of submerged vanes is preserved up to qr of 0.2 at an installation angle of 30°. Beyond this amount, the efficiency of vanes in removing bed sediments decreases and other appropriate options should be used.