Performance-Based Design of Caisson Breakwaters with New Approach to Extreme Wave Statistics
Performance-Based Design of Caisson Breakwaters with New Approach to Extreme Wave Statistics
复制标题
采用极端波浪统计新方法的沉箱防波堤的基于性能的设计
DOI：
10.1142/s0578563401000384
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发表时间：
2001
影响因子：
2.4
通讯作者：
Y. Goda
中科院分区：
文献类型：
--
作者：
Y. Goda
沉箱防波堤的性能化设计对风暴波高度极值分布函数的选择非常敏感。引入新的传播参数γ50来表征极端分布函数，定义为50年波高与10年波高之比。允许滑动距离的阈值标准设定为总滑动距离超过0.3m的超出概率为0.10。蒙特卡罗模拟对沉箱防波堤滑动性能的分析表明，γ50值较大的极端分布要求在水深大于等效深水有义波高2.5倍左右的位置采用较大的沉箱宽度。然而，在较浅的水域中，分布函数的影响消失，因为波浪破碎过程主导了防波堤的稳定性。近海区域最佳重现期为使用寿命的4～5倍，但比浅水区使用寿命短。
The performance-based design of caisson breakwaters is quite sensitive to the selection of extremal distribution functions for storm wave heights. A new spread parameter γ50 is introduced to characterize extreme distribution functions, being defined as the ratio of 50-year wave height to 10-year height. The threshold criterion for permissible sliding distance is set at the exceedance probability of total sliding distance over 0.3 m being 0.10. Analysis of sliding performance of caisson breakwaters by the Monte Carlo simulation shows that the extreme distribution with a large γ50 value demands a large caisson width in the location where the water depth is greater than about 2.5 times the equivalent deepwater significant wave height. In shallower water, however, the effect of the distribution function disappears because the wave breaking process dominates the breakwater stability. The optimal return period is 4 to 5 times the service lifetime in the offshore zone, but it becomes shorter than the service lifetime in shallow water.