A numerical study of the effect of a lateral intake's position and angle on scouring around a pier in a bend

The present paper addresses the effect of placing an intake, as a diversion structure, in different positions and with various angles in a 180 degrees bend to investigate the scour depth around a circular pier in an SSIIM2 numerical model. The simulation was conducted by placing the intake at the 75 degrees, 90 degrees, 115 degrees, 135 degrees, and 150 degrees positions with 45 degrees, 60 degrees, and 90 degrees angles. The results indicated that the greatest effect was associated with the installation of the intake with a 90 degrees angle at the 135 degrees position, which decreased the maximum scour depth by a considerable amount, about 70%, compared with the bend without an intake. However, the maximum scour depth occurred with the installation of the intake at the 150 degrees position with an intake angle of 45 degrees and increased by 20% compared to the bend without an intake. Furthermore, the maximum and minimum scour hole wall slopes around the pier in the case of the bend with an intake respectively increased by 6.24 times and decreased by 5.1 times compared to the bend without an intake at the upstream pier. The maximum sedimentation height around the pier decreased by about 40% in the bend with an intake compared to the one without an intake.