Experimental Study on Local Scour around Monopile Foundation in Breaking Waves
Breaking waves in nearshore areas can induce intense sediment movement,leading to local scour around monopile foundations within the surf zone,posing a serious threat to the stability of monopile structures.In this study,prototype sand with a median particle size of 0.32 mm is used to lay a flat sand bed in a wave flume for conducting experiments on the scouring of monopile by breaking waves.Regular waves passing over a slope with a gradient of 1∶20 shoaled,broke in the rectangular sand bed area.In the research,the influence of the ratio(α)of the distance between the pile and the breaking point to the wavelength on the maximum local scour depth(Smax)and scour morphology of monopile foundation is analyzed.The study results indicate that the turbulent flow generated by the overturning of breaking waves and its longitudinal development are crucial factors in causing scour,closely linking the relative distance(α)with the maximum local scour depth(Smax).Under the action of breaking waves,the sand bed forms sand bars and trough system,continuously affecting the evolution process of local scour around monopile.When the relative distance(α)is in the range of 0.35 to 0.55,the presence of the monopile causes the most significant scour,and the maximum local scour depth around the pile,superimposed with the bar and trough topography,can reach 0.5 times the pile diameter.
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