【摘要】 该文用Rayleigh展开和阻抗分析研究水波从离岸堤上的反射和传递,所得公式比现有计算公式简单,在正向或小的入射角作用下的反射和传递特征与现有结果吻合很好。在波长大于波栅常数时,结构厚度对绕射的影响显著,呈现出增强传递现象,迅衰波的作用变弱。相反情况,结构厚度的影响可忽略,迅衰波的作用明显。更多还原

【Abstract】 This paper used the Rayleigh expansions and impedance method to study water wave diffractions at offshore breakwater with periodic gaps.Present formulas have simple forms than previous ones.Under a normal or small incident angle,present results are the same as ones in references.When a ratio of grating constant to wavelength is larger than one,the influence of structural thickness on diffractions can be ignored,and evanescent waves play an important role.On the contrary,the effects of structural thickness on diffractions and the phenomenon of extraordinary wave transmission through the gaps are very obvious,and the role of evanescent waves gradually vanish.更多还原