Simulation and dynamic characteristics analysis of wave-current coupled sediment scouring and silting in high-pile wharf zones:a case study of Ningbo Chuanshan Port
A comprehensive wave-current coupled mathematical model integrating hydrodynamic,sediment transport,and morphodynamic was developed to investigate the morphodynamic evolution under the combined influence of waves and currents in the nearshore wharf areas.The model was validated with observed data on tidal levels,flow velocities,and sedimentation rates/sediment concentrations in the wharf region and its adjacent marine areas,showing substantial agreement.The study analyzed the hydrodynamics and sediment transport characteristics of the wharf area,revealing the normal condition pile group's flow-blocking features and back-siltation mechanisms behind the wharf,and explored the scouring and silting evolution under extreme conditions.Analysis of simulation results indicates that tidal dynamics play a significant role in controlling the scouring and silting processes in the wharf area under normal weather conditions,with scouring primarily occurring during the rising tide and silting mainly regulated by the ebbing tide.During typhoon conditions,intense wave-current interactions may cause drastic scouring and silting in the wharf area.Specifically,during a typhoon,there is intense scouring beneath the wharf and minor scouring behind it,followed by gradual siltation after the typhoon.The wharf's pile groups significantly influence the hydro-sedimentary dynamics and topographical changes,where the pile group's resistance reduces the tidal current's strength,enhancing sedimentation in the wharf area.
morphological evolutionwave-current couplingsediment transportnumerical simulationpile group flow-blocking characteristics
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