Numerical Study On The Hydrodynamic Characteristics Of Twin Plate Type Breakwater For Wave Dissipation

China is a major oceanic country.In recent years,due to various factors,the erosion of the Chinese coast has become more and more serious.In addition,the national strategy for the development of the oceans is also related to the people's livelihood and the country's security.Therefore,the protection of the coast has become urgently needed.As we all know,the breakwater is a structure that prevents the invasion of waves and ice.This structure is widely used in artificial islands,marine development platforms,and coastline protection.This paper studies a new type of breakwater that combines the advantages of floating and transmissive breakwaters.The breakwater is a double curved plate structure,and the main content of the exploration is the wave-eliminating effect of the breakwater under the action of regular waves.In order to analyze the wave breaking capacity of the breakwater,this paper also made corresponding research and analysis on the wave-proof capability of the double-layer horizontal breakwater.The factors that affect the wave elimination effect considered in this study include S/d,D/d,H/d,and B/L.According to the study,I found that:(1)Within the scope of the experimental study,for the double-layered arc-type breakwater and the double-level horizontal breakwater,the change law of the transmission coefficient with the S/d change is not the same,but the magnitude of change is within 0.05.Therefore,the effect of S/d on the wave elimination effect of the two structures was not significant.(2)Within the scope of the experimental study,the B/L variation has different effects on the transmission coefficient of the double-level slab breakwater and the double-layered arc breakwater.For flat panels,the transmission coefficient varies with B/L under different depth conditions:When D/d is-0.04,the transmission coefficient first decreases and then increases and at last decreases with increasing B/L;When D/d is 0 and 0.04,the transmissivity first decreases and then increases with increasing B/L,and the maximum transmission coefficient can be reduced by about 0.3.For arc plate breakwaters,the transmission coefficient changes with B/L at different depths and wave heights and the law is basically the same:When D/d is-0.04,0,and 0.04,the transmission coefficient shows the trend of decreasing then increasing and then decreasing with increasing B/L.The maximum reduction is also around 0.3.Therefore,the change of B/L has a greater influence on the transmission coefficient of the structure.(3)Within the scope of the experimental study,H/d has different effects on the transmission coefficient of the two structures.When D/d is-0.04,for the flat panel,the transmission coefficient decreases with increasing H/d;however,the change pattern of the arc plate is the opposite.When D/d is 0.04,the transmission coefficient increases with the increase of the relative wave height for the flat plate and the arc plate.Under other conditions with different depths and S/d,the transmission coefficients of the two structures do not change significantly with changing H/d.(4)Within the scope of the experimental study,the effect of D/d on the transmission coefficient of the double-layer arc plate is basically the same under different wave heights of different plate spacings conditions:the transmission coefficient first decreases and then increases with increasing D/d.And,with the increase of S/d,the law of change is more and more obvious.For double horizontal plates,as the D/d increases,the transmission coefficient shows a trend of decreasing first,then increasing and then finally decreasing,and the tendency of the transmission coefficient to decrease with increasing S/d is also becoming more obvious.The purpose of this paper is to compare and analyze the wave-eliminating effect of the double-layer flat plate and the double-layer arc plate breakwater under the test conditions through the numerical simulation and physical test methods,and finally find out the structural form with better wave-reducing effect.So that it can provide guidance for the design of breakwaters.