三种组合浮囊型浮式防波堤的消浪特性对比研究

Comparative Study on Wave Dissipation Characteristics of Floating Breakwaters Based on Three Combinations of Capsules

本文针对组合浮囊型浮式防波堤结构,提出了三种不同组合的结构方案,并通过Flow-3D软件进行数值计算,对比分析了在中等水深的长周期波条件下的消浪性能。并得到以下结论:浮囊按矩形布置的组合型式比按三角形布置的组合型式消浪效果更好;无论是矩形布置还是三角形布置,双层浮囊排列的浮式防波堤在D/d>0.5或B/L>0.3的情况下均可以达到消减一半波能的目的;相比箱板式浮式防波堤,板阻式可以通过扰动底部水质点运动进一步提高浮式防波堤的消浪性能。同时,针对板阻式结构,由于下部浮囊在横断面方向不是整排布置,本文引入关于下部浮囊宽度的修正系数对相对吃水进行修正,结果表明,除下部浮囊个数的影响外,其透射系数还可能与波浪作用有关。

Three combinations of capsules are proposed in the design of combination-capsule floating breakwater.The numerical calculation is carried out by using Flow-3D software in order to compare and analyze the wave dissipation performance under the conditions of long period waves and medium water depth.The conclusions are made as follows.The combination based on rectangular layout of capsules has better wave dissipation effect than that of triangular layout.Regardless of rectangular or triangular layouts,the floating breakwater consisting of double layers of capsules may reduce wave energy by half subject to D/d>0.5 or B/L>0.3.Compared with box-slab floating breakwater,slab-resistance structure can further improve wave dissipation performance of the floating breakwater by disturbing bottom water particle motion.As for the slab-resistance structure,the lower floating capsules are not arranged as a whole row in the cross-section direction,the correction coefficient for the width of the lower floating capsules is adopted to revise relative draft.The results show that the transmission coefficient may be related to wave action besides the number of lower capsules.