Wave‐induced pore pressure measurements near a coastal structure
Wave‐induced pore pressure measurements near a coastal structure
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DOI：
10.1029/2008jc005071
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发表时间：
2009-06
影响因子：
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通讯作者：
H. Michallet;M. Mory;I. Piedra-Cueva
中科院分区：
文献类型：
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作者：
H. Michallet;M. Mory;I. Piedra-Cueva
[1]波浪引起的孔隙压力在不同深度下的桑迪床在前面的海岸结构。2003年9月，在法国西南部的卡普布雷顿（Capbreton）海滩进行了为期一周的现场实验。海岸结构位于海滩的潮间带。土壤内的压力变化的传输，相比在水层中的波产生的压力变化，分析在振幅衰减和相移方面，并与理论模型相比。还测量了土壤中的气体含量。结果表明，含气量是影响土内压力传递的关键参数。结果表明，波浪周期内产生了一个显著的向上压力梯度，该压力梯度可覆盖30 cm深的土壤表层。这可以用瞬时液化事件来解释。在不同的潮汐期间调查的现象变化的方式进行了描述。讨论了结果与波高和床面的关系。而土壤性质没有修改过潮汐期间，当波的活动是足够低的，一个显着的变化，在土壤内的压力变化的传输时，观察到的结构受到较大的波浪。这可以解释为表层气体含量的变化。
[1] Wave-induced pore pressures were measured at various depths below the sandy bed in front of a coastal structure. The results of a weeklong field experiment carried out in September 2003 on the beach of Capbreton, in southwest France, are presented. The coastal structure was located in the intertidal zone of the beach. The transmission of pressure variations inside the soil, as compared to the pressure variations produced by the waves in the water layer, are analyzed in terms of both amplitude decay and phase shifts and compared to theoretical models. The gas content inside the soil was also measured. The results confirm that the gas content is a key parameter affecting the transmission of pressure inside the soil. It is shown that a significant upward pressure gradient is generated during a wave period, which can liquefy a 30 cm deep superficial layer of the soil. This is interpreted in terms of momentary liquefaction events. The manner in which the phenomena change during the different tidal periods investigated is described. The dependence of the results on wave height and bed level is discussed. Whereas the soil properties were not modified over a tidal period when the wave activity was sufficiently low, a significant change in the transmission of pressure variations inside the soil was observed when the structure was subjected to larger waves. This is interpreted in terms of a change in the gas content in the superficial layer.