波浪从离岸防波堤上的反射和传递  

WAVE REFLECTION AND TRANSMISSION FROM OFFSHORE BREAKWATER

作　　者：朱大同[1,2] 

机构地区：[1]东南大学江苏省工程力学分析重点试验室和土木工程学院,南京210096 [2]南京水利科学研究院河流与海岸研究所,南京210024

出　　处：《工程力学》2013年第3期239-243,共5页Engineering Mechanics

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。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.

关 键 词：离岸堤 规则波 Rayleigh展开 阻抗分析 反射系数 传递系数 

分 类 号：P752.1[天文地球—海洋科学]