中文摘要：

中咀湾是一个天然的避风良港，一般情况下外海波浪影响很小，主要受局部风场产生的局部风浪影响。本文采用曹宏生在Massel的扩展缓坡方程基础上推导出来的考虑陡变地形和能量耗散效应的缓坡方程为控制方程，结合固边界的反射边界条件，构成波浪传播变形的联合折射、绕射和反射的数学模型。文中将此方法运用在中国台州市大陈岛中咀湾避风港中，用波浪数学模型计算极端高水位和设计高水位时3种波况分别在3组重现期时工程海域的波浪要素，提供防波堤的堤前波高，并分析比较此处实心式和透空式防波堤的防浪性能。

英文摘要：

Zhongzui Bay is a natural harbour, which is affected by wind waves mainly. Taking the steep slope bottom and the effect of energy dissipation in account, the numerical model of wave propagation and deformation is constructed, including wave refraction, diffraction and reflection, combining solid reflection boundary condition. This model is available after being validated by Cao Hongsheng. The method is used in the sheltering harbour of Zhongzui Bay. Under extreme high water level and design high water level, wave parameters in the calculation area of three wave types in three different return periods were calculated by using this wave numerical model respectively. In addition, wave heights in front of breakwater are provided. And the wave parameters of two occasions, with and without breakwater, are gained in calculation area. Wave transmission effects of breakwater are compared between solid breakwater and permeable breakwater in the end.