圆弧型贯底式透空防波堤对孤立波的绕射  

Diffraction of solitary wave by arc-shaped bottom-mounted porous breakwater

作　　者：张敖[1] 黄华[1] 詹杰民[1] 朱梦华[1] 

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：《中山大学学报（自然科学版）》2017年第3期8-16,共9页Acta Scientiarum Naturalium Universitatis Sunyatseni

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：基于孤立波模型和水波绕射理论,应用特征函数展开法,推导了圆弧型贯底式透空防波堤引起的对孤立波绕射的波势解,并据此解析计算了作用于防波堤的水平波浪载荷和孤立波最大波面分布。计算结果表明:结构表面透空可明显减小防波堤所受波浪载荷,并改变了孤立波的绕射最大波面分布;而孤立波入射角度与非线性影响参数、海况条件以及防波堤几何条件等因素的相对变化对波浪作用均存在一定的影响。与浅水条件下微幅波理论的结果进行对比,可知:在一定浅水条件下采用孤立波模型计算所得的最大无量纲波浪力和最大波面分布值均明显高于微幅波理论的对应估值,反映了浅水波非线性因素的影响效应。Based on wave model and wave diffraction theory, the wave potential solutions to solitary wave diffraction by arc-shaped bottom-mounted porous breakwater are derived by applying the eigenfunction ex- pansion approach, and accordingly the horizontal wave loads on breakwater and maximum solitary wave free surfaces are analytically calculated. The evaluating results demonstrate that the porosity of lateral sur- face of arc-shaped breakwater may lead in an obvious reduction in wave loads on breakwater and changes the distribution of maximum solitary wave free surfaces. Furthermore, the variation of incident wave an- gle, nonlinear influence parameter of wave, sea water condition, and breakwater structure geometry con- dition may have some influence on solitary wave effects on breakwater. Compared with small amplitude wave theory, it is known that in certain shallow water conditions the results of maximum dimensionless wave forces and wave free surfaces from solitary wave theory are obviously larger than those predicted by small amplitude wave theory for shallow water, it denotes that solitary wave theory can reflect shallow wa- ter wave nonlinear effects.

关 键 词：圆弧型贯底式透空防波堤 孤立波 特征函数展开法 波浪绕射 波浪力 

分 类 号：O353[理学—流体力学]