Intake design attributes and submerged vanes effects on sedimentation and shear stress

摘要

Physical modelling was used to assess the effects of the inlet shape, angle, diverted flow discharge and submerged vanes on the rate of sediment entry, erosion and shear stress of the intake. Experiments were conducted in a 55(-)degree intake channel branched from a rectangular channel. The mouth of the intake was chosen in two forms of sharp and rounded edge. Sedimentation and erosion values were measured in discharges of 11 and 16.6 l/s in the main channel with the four diversion flow ratios as 0.2, 0.4, 0.6 and 0.8. The submerged vanes were used in parallel and zigzag arrangements at angles of 10 degrees and 30 degrees. The results showed that making the mouth of the intake as rounded edge causes increase in the erosion and decrease in the sedimentation and hence reduction in deposited sediments. The shear stress was less in the presence of submerged vanes compared to the mode without installing the vanes.