【摘要】 针对水面防波堤消减长周期水波难题，采用宽间距排列的多重箱体，利用Bragg反射共振加强对长周期波反射，从而消减波浪。基于势流理论建立二维凹槽地形数值波浪水槽，应用去奇异边界元法数值求解系列规则波通过多重穿透水面箱体流场，并计算防波堤水动力系数。在通过与不同文献中结果进行对比和验证本文数值方法有效的基础上，改变箱体数量、宽度、吃水及间距，分析水动力系数的变化规律和Bragg共振的特征。结果表明，增加箱体数量、宽度和吃水能够加强反射减小透射，有利于消波；并且本文当波长位于一阶Bragg共振点2L/λ=1(L为间距，λ为波长)右侧时发生反射共振，透射显著减弱，说明适当设计的水面宽间距多体具有消减长周期波的性能。更多还原

【Abstract】 With respect to the problem of reducing long-period water waves by surface breakwaters, multiple boxes arrayed with wide space were adopted, and Bragg reflection resonance was used to enhance reflecting long period waves and reduce waves. Based on the potential theory, a 2D numerical wave flume with trench terrain was created, the desingularized boundary element method was utilized to solve the flow fields that regular waves pass through multiple surface-piercing boxes, and the hydrodynamic coefficients were computed. On the basis of comparing the computed results with those in different literatures and verifying the validity of the numerical methods adopted in this paper, changing the number, width, draft and spacing of the boxes, the variations of hydrodynamic coefficients and the characteristics of Bragg resonance were analyzed. The results indicated that increasing the number, width and draft of the boxes can strengthen the reflection and reduce the transmission, which is conducive to wave dissipation; and herein, the reflection resonances occur when the wavelengths are located at the right side of the first-order Bragg resonance point 2L/λ=1(L is the spacing and λ is the wavelength), and the transmissions are significantly weakened, which demonstrates that the multiple wide-spaced surface-piercing bodies with proper design have the property to effectively mitigate long period waves.更多还原