Abstract
Mining activities can endanger the stability of hydraulic structures. Numerical modeling of local scouring around hydrodynamic and circular bridge pile groups, due to the action of clear water conditions via non-cohesive sediment, was performed using a computational fluid dynamics (CFD) model, a large eddy simulation (LES) turbulence model, and a van Rijn sedimentary model with FLOW-3D software. The pile groups were positioned upstream and downstream of a sand mining pit. The results showed that the scour depth around the downstream pile group was greater than that of the upstream one. Using hydrodynamic piers reduced the scour depth upstream of all piers and the material harvesting pit. The maximum reduction in scour depth was observed in front of the fifth pier, with a 29% reduction in scour depth. Additionally, for all models, as the material harvesting pit was moved downstream, the downstream turbulence was enhanced and stronger flow reversal and horseshoe vortices were detected in from of the downstream pile group. The flow patterns around the pile group showed that the presence of hydrodynamic piers in the upstream pile group leads to a decrease in the maximum flow velocity, whereas, when such piers were positioned in the downstream pile group, the velocity increases.
Highlights
Increased transportation requirements have increased the need for wide bridges supported by large piers
The scouring around a bridge pile group in the presence of a material harvesting pit is influenced by parameters related to the material harvesting pit, fluid flow, sediment, flume geometry, bridge piers, and scour pit
The current study investigated local scour around pile groups positioned upstream and downstream of a harvest pit
Summary
Increased transportation requirements have increased the need for wide bridges supported by large piers. Lade et al [18] conducted experimental research on a rectangular pit that was excavated upstream of two circular piers embedded in the sand-bed in a tandem arrangement They found that mining activities near the piers can lead to significant changes in the flow field, causing excessive scour around piers. Majedi-Asl et al [19] studied the effect of river material harvesting pits on scouring around pile groups under different hydraulic and sedimentary conditions. Daneshfaraz et al [20] investigated the effect of flow rate on scour around pile groups bridged with sand in the presence of a material harvesting pit. Streambed alterations, such as scour depth and bed levels and alterations in flow parameters, such as mean velocity around the piers, were investigated
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