Experimental Study on Sediment Suspension over the Liquefied Sand-clay Seabed under Waves

IF 4.3 2区工程技术 Q1 ENGINEERING, OCEAN

Applied Ocean Research Pub Date : 2024-11-14 DOI:10.1016/j.apor.2024.104314

Jun Zhang , Lizhu Wang , Zhiyong Zhang , Yihao Sun

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Abstract

The characteristics of erosion and sediment suspension over the wave-induced liquefied mixed seabed are investigated experimentally in this study, as well as the mechanism underlying the phenomena. The mixed beds with various Clay Content (CC) ranging from 0 to 9.9 % were tested under a specific wave condition. The erosion depth of beds, Excess Pore water Pressure (EPP), and Suspended Sediment Concentration (SSC) are measured and analyzed at different liquefaction stages, and their relationships with CC are emphatically discussed. The results show that the erosion depth and SSC vary non-linearly with CC. The cohesive beds with 0.5 % and 1 % CC erode more significantly than the cohesionless sand bed. The erosion depth and SSC of mixed beds with >1 % CC, decrease with the increase of CC. The accumulated EPP significantly reduces the critical shear stress of the beds through the seepage force, while the cohesive force from the clay content increases it, leading to the complicated phenomena of mixed seabed under wave actions.

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波浪作用下液化砂粘土海底沉积物悬浮实验研究

本研究通过实验研究了波浪诱发液化混合海床的侵蚀和沉积物悬浮特征，以及这些现象的内在机理。在特定的波浪条件下，对不同粘土含量（CC）（0-9.9%）的混合海床进行了测试。对不同液化阶段的床面侵蚀深度、过剩孔隙水压力（EPP）和悬浮泥沙浓度（SSC）进行了测量和分析，并重点讨论了它们与 CC 的关系。结果表明，侵蚀深度和 SSC 与 CC 呈非线性变化。与无粘性砂床相比，CC 含量为 0.5 % 和 1 % 的粘性砂床的侵蚀更为明显。含 1 % CC 的混床的侵蚀深度和 SSC 随 CC 的增加而减小。累积的 EPP 通过渗流力大大降低了海床的临界剪应力，而粘土含量产生的内聚力则增加了临界剪应力，从而导致了波浪作用下混合海床的复杂现象。

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来源期刊

Applied Ocean Research 地学-工程：大洋

CiteScore

8.70

自引率

7.00%

发文量

316

审稿时长

59 days

期刊介绍： The aim of Applied Ocean Research is to encourage the submission of papers that advance the state of knowledge in a range of topics relevant to ocean engineering.