Experimental and Numerical Study of Local Scouring Downstream of D-Type Piano Key Weir

The present paper aims to evaluate the local scouring of non-cohesive sediment beds consisted of uniform sediment particles downstream of a D – type piano key weir in steady flow condition. The experiments were conducted for one model of D - type piano key weir with five keys. Accordingly, the effect of hydraulic parameters was examined on scouring profiles and depth, downstream of the piano key weir. While nine runs were conducted to evaluate the local scouring downstream of the piano key weir under clear-water conditions with different discharge rates and tail water depths. The experimental results showed that the maximum scouring depth increased with increasing the discharge. Further, increasing the tail water depth resulted in decreasing the largest scour depth. The 3D numerical simulation was implemented using a CFD package. Overall, the results of the numerical modelling were in agreement with the experimental data.