Stability analysis of composite breakwater with wave-dissipating blocks considering increase in sea levels, surges and waves due to climate change
Stability analysis of composite breakwater with wave-dissipating blocks considering increase in sea levels, surges and waves due to climate change
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DOI：
10.1016/j.oceaneng.2012.12.037
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发表时间：
2013-10
影响因子：
5
通讯作者：
H. Mase;D. Tsujio;T. Yasuda;N. Mori
中科院分区：
文献类型：
--
作者：
H. Mase;D. Tsujio;T. Yasuda;N. Mori
沉箱前消浪块体的沉降是由于波浪作用直接引起块体的位移和破碎，也是由于波浪力作用下沉箱的滑动引起的。块体的沉降量、沉箱滑动和波浪压力是相互关联的。本文提出了在海平面上升、风暴潮和海浪增多等气候变化影响下，消浪块体复合防波堤的稳定性分析方法。研究发现，在不修复破损块体的情况下，由3种滑移距离的允许超限概率确定的沉箱预期滑移距离和必需沉箱宽度相对于消浪块体重量的变化在一定块体重量处有最大值的趋势，反之，如果每次修复后达到总截面的5%的损伤程度，则沉箱滑动距离和必需沉箱宽度相对于块体重量的变化呈单调递减趋势。气候变化对滑移距离和必要宽度的影响使这些值比由目前气候条件给出的恒定外力计算的值大10-60%。
Settlement of wave-dissipating blocks in front of caisson is caused by displacement and breakage of blocks directly by wave action and also by sliding of the caisson by wave force. The settlement of blocks, caisson sliding and wave pressure are mutually correlated. The present study has developed a stability analysis method for a composite breakwater with wave-dissipating blocks under the circumstances of climate change effect as seen in sea level rise and increase in storm surges and waves. It is found that the changes of expected caisson sliding distance and necessary caisson width, determined from the allowable excess probabilities for three prescribed sliding distances, against the weight of wave-dissipating block have a tendency to be maximum at certain block weight when repairing of damaged blocks is not done; on the other hand, if repairing is done every time after reaching 5% damage level of the total section, the changes of caisson sliding distance and necessary caisson width against the block weight show monotonous decrease. The effects of climate change on the sliding distance and necessary width are found to make those values larger by 10–60% than those calculated by constant external forces given from the present climate conditions.