Optimization of the Impermeable Straight Dike Location in the Opposite Bank of the Base Location

Erosion of riverbank edges is one of the major concerns of the hydraulic engineers. Using spur dikes is one of the methods which help to control and reduce the erosion. In the present study, the location of the spur dikes in the riverbank was optimized numerically using the FLOW-3D numerical model. Comparison of the numerical and experimental results showed a good agreement between them. In addition, the level of riverbank protection was also studied in the present study considering six different spur dike locations. The results showed that by changing the location of the spur dike toward downstream, the spur dike in the location with a dimensionless ratio of d/L=1.834 (the spur dike located 66 cm away from the base beginning) protected a greater riverbank area against erosion. The spur dike in the mentioned location decreased the riverbank erosion in the cross-section and in the longitudinal section by 21.65% and 17.12%, respectively.