孤立波斜坡堤堤顶及后坡越浪流数值分析  

Numerical Analysis of Overtopping Flow on Crest and Landward Slope of Seadike in Solitary Wave

作　　者：曾婧扬[1] 吴卫[1] 刘桦[1,2] 

机构地区：[1]上海交通大学船舶海洋与建筑工程学院,上海200240 [2]上海交通大学水动力学教育部重点实验室,上海200240

出　　处：《力学季刊》2013年第2期181-190,共10页Chinese Quarterly of Mechanics

基　　金：教育部博士点基金;上海市自然科学基金(11ZR1418200);上海市重点学科建设项目(B206);上海市水务局科研项目;上海市闵行高层次人才发展专项;海洋工程国家重点实验室自主研究课题的资助

摘　　要：孤立波往往被用来模拟海啸等浅水大波。运用基于RANS方程、VOF方法以及Goring造波方法建立了二维数值波浪水槽,进行了孤立波在简单斜坡堤上越浪过程的数值模拟。通过数值模拟,研究了不同相对堤顶宽及不同相对波高条件下对孤立波越堤流基本特征,包括堤顶前缘水层厚度及速度、堤顶末端水层厚度及速度、堤顶流厚度及速度沿程分布、后坡流厚度及速度沿程分布。依据数值实验结果,建立了堤顶流最大厚度分布及最大速度分布的经验公式。计算结果表明,堤顶流厚度沿程减小,而堤顶流速度则沿程增大;后坡流厚度先增大,随后再沿程缓慢减小;后坡流速度先减小,随后再沿程缓慢增大。Solitary wave is used to describe the tsunami and other shallow water waves with large ampli- tude. A two-dimensional numerical flume was established based on RANS equation, VOF method and the Goring approach for wave generation. The solitary wave with different relative wave amplitude generated by the flume boundary was validated with the theoretical solution of solitary wave. Several cases of nu- merical simulation were carried out for seadikes of different crest widths and incident solitary waves with the diferent wave amplitude. Key characteristic variables of the overtopping flow are the flow thickness and velocity at the seaside of the crest, the flow thickness and velocity at the landside of the crest. Distri- bution of thickness and velocity on the crest and distribution of thickness and velocity on the landward slope were provided. Two empirical formulas were established to fit the result of simulation for distribu- tion of overtopping thickness and velocity on the crest respectively. It turns out that the flow thickness decreases along the crest, while the maximun velocity increases along the crest. It is interesting to note that the variations of the flow thickness and velocity on the landward slope are a little bit complicated.

关 键 词：斜坡堤 孤立波 越浪流 数值模拟 

分 类 号：U656.2[交通运输工程—港口、海岸及近海工程]