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Pore Pressure Response to Irregular Waves at a Sandy Beach

机译：沙滩上不规则波的孔隙压力响应

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Two vertically aligned pressure transducers were embedded at a sandy beach at a sediment depth of 5 cm and 20 cm, respectively. Pore pressure buildup, and the impact of horizontal and vertical pressure gradients were assessed with regard to the ocean wave forcing. The results indicated that all three processes may impact and enhance sediment erosion. Excess pore pressure built up, and exceeded the initial mean effective stress at both measurement sediment depths. However, the pore pressure build-up appeared interrupted by irregular wave forcing. The critical instantaneous Sleath parameter for sediment mobilization by horizontal pressure gradients was exceeded for many wave cycles, suggesting a contribution to sediment erodibility. Upward directed vertical pressure gradients exceeding the buoyant specific weight were measured, being likely associated to the formation of wave groups. The field study represents a proof-of-concept for future field investigations regarding pore pressure response to wave forcing.
机译：两个垂直排列的压力传感器分别埋在沙滩上，沉积深度分别为5 cm和20 cm。评估了孔隙压力的形成以及水平和垂直压力梯度对海浪强迫的影响。结果表明，这三个过程都可能影响和加剧泥沙侵蚀。在两个测量沉积深度处都形成了过量的孔隙压力，并超过了初始平均有效应力。但是，孔隙压力的增加似乎被不规则的波浪力打断了。在许多波浪周期中，通过水平压力梯度动员沉积物的临界瞬时潜息参数被超过，这表明对沉积物易蚀性的贡献。测量了超过浮力比重的向上指向的垂直压力梯度，这很可能与波浪群的形成有关。现场研究代表了有关孔隙压力对波浪强迫响应的未来现场研究的概念证明。

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