Investigation of Local Scouring around Hydrodynamic and Circular Pile Groups under the Influence of River Material Harvesting Pits

Mining activities can endanger the stability of hydraulic structures. Numerical modeling local scouring around hydrodynamic and circular bridge pile groups, due to action clear water conditions via non-cohesive sediment, was performed using a computational fluid dynamics (CFD) model, large eddy simulation (LES) turbulence van Rijn sedimentary model with FLOW-3D software. The groups were positioned upstream downstream sand mining pit. results showed that scour depth group greater than one. Using piers reduced all material harvesting maximum reduction in observed front fifth pier, 29% depth. Additionally, for models, as pit moved downstream, enhanced stronger flow reversal horseshoe vortices detected from group. patterns presence leads decrease velocity, whereas, when such group, velocity increases.