| 摘要: |
| 应用椭圆余弦波理论,给出了V形薄壁防波堤的浅水波绕射理论解,将现有的Airy微幅波理论加以了有效拓展。通过对V形防波堤的浅水波浪力进行实算,揭示了椭圆余弦波对防波堤的作用规律。计算结果表明：椭圆余弦波理论计算的V形防波堤的最大无量纲波浪力明显大于相同浅水条件下Airy微幅波理论的对应结果。本文方法适用于张角180度的有限长直立薄壁防波堤的浅水波绕射作用计算,从而将无限长直立薄壁堤的反射波理论加以有效拓展。此外,浅水波入射角、V形堤张角和防波堤臂长与水深比等参数的变化均将对V形堤的波浪作用产生相关影响,而V形堤的实际绕射波浪力幅值将随浅水波特征参数值的增加而增加。 |
| 关键词: 椭圆余弦波 V形防波堤 波浪力 波浪绕射 |
| DOI： |
| 分类号:O353 |
| 基金项目:国家重点项目(41407010501),中央高校基本科研业务费专项基金(No.17lgjc41) |
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| Analytical calculation of cnoidal wave diffracted force on a V-shaped breakwater |
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Cai Hantao, HUANG Hua, Su Wei
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Department of Applied Mechanics and Engineering,College of Aeronautics and Astronautics,Sun Yat-sen University
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| Abstract: |
| With the use of cnoidal wave theory, the theoretical solutions to shallow water wave diffraction by a V-shaped breakwater are derived, so the existing Airy small amplitude wave theory is effectively extended. By calculating the shallow water wave forces on the V-shaped breakwater, the law of cnoidal wave action on the breakwater has been revealed. The results show that the maximum dimensionless wave forces on the breakwater are obviously larger than those predicted by small amplitude wave theory under same shallow water conditions. The method given in the paper is suitable to calculate diffracted wave effects on the finite length vertical thin-walled breakwater with the breakwater angle 180o, so the reflected wave theory on the infinite long vertical thin-walled breakwater is effectively extended. The variation of incident wave angle, breakwater angle and ratio of breakwater arm length and water depth may have some related influence on wave effects and the practical maximum diffracted wave forces will increase as the shallow water wave characteristic parameter value increases. |
| Key words: cnoidal wave V-shaped breakwater wave force wave diffraction |
