Experimental study on the scour of the seabed around the tripod foundation under the combined action of wave and current
Under the action of waves and currents,offshore wind power foundations may experience lo-cal erosion,resulting in an increase in the length of the foundation cantilever,which seriously affects the stability and safety of the foundation.To investigate the local erosion characteristics of offshore wind power tripod foundations under the combined action of waves and currents,local erosion tests were conducted on tripod foundations with different installation angles in a wave current tank.The characteristics of local erosion depth,influencing factors,and the morphology of erosion pits were studied.The research results indicated that under the action of individual waves,the central column provided a certain protective effect on downstream piles,weakening the development of erosion.When waves and currents acted together,waves provided drag force on the bottom bed,while water flow pro-vided sediment transport force,resulting in a significant increase in scouring depth.When the installa-tion angle was 30°,the water blocking effect on the double pile side of the tripod was greater,and some water flow was directed towards the single pile side,resulting in an increase in the scouring depth.As the flow velocity,wave height,and KC increasing,the depth of erosion around the foundation gradual-ly increased.An empirical formula using KC to predict the equilibrium scour depth had been proposed,which could accurately predict the equilibrium scour depth of local scour on a tripod foundation under wave action and wave current combined action.
combined action of wave and currenttripod foundationlocal scourmaximum scour depthequilibrium scour depth
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