波浪对二层海水中的直立圆弧形透空防波堤的绕射  

Wave diffraction from a vertical arc-shaped porous breakwater in two layer sea

作　　者：翟振峰 黄华[1] 詹杰民[1] 张敖[1] ZHAI Zhen-feng;HUANG Hua;ZHAN Jie-min;ZHANG Ao(Department of Applied Mechanics and Engineering,College of Engineering,Sun Yat-sen University,Guangzhou 510275,China)

机构地区：[1]中山大学工学院应用力学与工程系,广东广州510275

出　　处：《水运工程》2018年第7期51-58,共8页Port & Waterway Engineering

基　　金：广东省协同创新与平台环境建设专项项目(2014B090904066);广东省公益研究与能力建设专项项目(2015A020216008)

摘　　要：基于二层海水的微幅波绕射理论,应用特征函数展开法,推导了在二层海水中波浪对直立圆弧形透空防波堤绕射的波势解析解,并据此分别计算了作用于防波堤的表面波与内波载荷以及最大波面分布。计算结果表明:在防波堤结构表面适度布孔既可以明显减小所受到的表面波与内波载荷,又可改变绕射水波的最大波面分布。而表面波与内波各自作用于防波堤上的无量纲最大波浪载荷可能具有相同量级,说明内波作用不可忽视。海况与波浪条件以及防波堤几何条件等因素的相对变化对波浪的绕射均有一定影响,而表面波与内波在波浪作用的变化规律上存在一定差异。Based on small amplitude wave diffraction theory in two layer sea,the analytical solutions to the diffracted water wave potentials from a vertical arc-shaped porous breakwater are derived by applying eigenfunction expansion approach.According to the analytical solution,the wave loads caused by internal wave and surface wave and the distribution of maximum wave free surfaces are respectively evaluated.The results show that the appropriate hole arrangement on the surface of breakwater not only leads to an obvious reduction in surface wave and internal wave loads, but also causes changes of maximum wave distribution of diffracted water waves. The dimensionless maximum wave loads caused by internal wave may have same order of magnitude as that caused by surface wave,which implies that inner wave effects cannot be ignored. Furthermore,the relative variations of sea and water wave condition and breakwater geometry condition of breakwater have certain influence on wave diffraction,and there are some differences between surface wave and internal wave in the law of wave action.

关 键 词：圆弧形直立防波堤 二层海水 表面波与内波 特征函数展开法 波浪绕射 波浪力 

分 类 号：U656.2[交通运输工程—港口、海岸及近海工程]