Under the action of waves,high-speed wave-induced current will occur on the plateau of coral reefs,and the revetment structure therein is prone to damage and instability under the impact of high-speed water flow.Aimed at this problem,a physical model test for the interaction between the wave-induced current on the plateau and the re-vetment structure with crack defects was carried out,and the spectral density,characteristic distribution and inten-sity distribution of pulsating pressure in cracks were studied and analyzed,thus revealing the changing law of pulsat-ing pressure in crack defects of the revetment structure.Results showed that the main frequency value of fluctuating pressure at the characteristic positions of crack defects of the revetment structure corresponded to the frequency of incident wave.The pulsating pressure distribution at the crack entrance between the upper and lower caissons in the revetment structure was relatively stable.The pulsating degree of pulsating pressure at the measuring points gradually extending along the crack defects increased,and the complex turbulent flow spread in the crack defects with a larger swing amplitude in the vertical direction.Meanwhile,the negative pressure formed in the crack defects due to the turbulent flow's pulsating effect continued to grow,resulting in a significant increase in the root mean square value of pulsating pressure at the middle position,and the mutation value was about 7 times that at the crack entrance.When the values of reef plateau length were 1 m,2 m and 3 m,the values of pulsating pressure coefficient at the middle position were about 1.59,1.49 and 1.46 times that at the crack entrance,respectively.The pulsating pressure coeffi-cients at the measuring points along the crack defects were more sensitive to the reef front with a larger slope,and the greater the reef front slope rate,the greater the pulsating pressure coefficient.It was found that there exists a critical slope,and when the reef front slope rate was larger than this value while the relative submergence was in the range of 0.61-1.04,the pulsating pressure coefficient decreased by about 34%.In comparison,when the reef front slope rate was less than the critical slope,the correlation between the distribution of pulsating pressure coefficient along the crack defects and the reef front slope rate was weak.
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