Experimental study on impact behavior of submarine landslides on undersea communication cables
Experimental study on impact behavior of submarine landslides on undersea communication cables
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DOI：
10.1016/j.oceaneng.2017.11.050
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发表时间：
2018-01
影响因子：
5
通讯作者：
Fawu Wang;Zili Dai;Y. Nakahara;Tomokazu Sonoyama
中科院分区：
文献类型：
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作者：
Fawu Wang;Zili Dai;Y. Nakahara;Tomokazu Sonoyama
海底滑坡具有规模大、活动距离长的特点，可破坏海底通信电缆，造成巨大的经济损失。本文设计了一个实验装置来模拟海底滑坡与海底通信电缆之间的相对运动，并研究海底滑坡的冲击行为。试验结果表明，海底滑坡厚度越大、粒径越大，对通信电缆的冲击力越大。随着滑动速度的增加，土-水混合物的流动特性和冲击力的演化可分为3个阶段：1）滑坡阶段，混合物由水层和砂层组成，冲击力随滑动速度的增加而增大，并在此阶段达到峰值;（2）转化阶段，泥沙颗粒开始被水侵蚀，在土-水界面上形成浊流层。3）浊流阶段，泥沙颗粒全部被水冲蚀，继续增大流速，冲击力再次增大。
Submarine landslides, which are characterized by large scale and long run-out distance, could destroy undersea communication cables, thus resulting in a great number of economic losses. In this work, an experimental apparatus is designed to simulate the relative motion between the submarine landslide and undersea communication cable, and investigate the impact behavior of a submarine landslide. The test results show that submarine landslide with larger thickness and larger particle size can generate larger impact force on the communication cables. With an increase of the sliding velocity, the evolution of the flow behavior and impact force of the soil-water mixture can be divided into three stages: 1) landslide stage, the mixture consists a water layer and a sand layer, the impact force increases with the sliding velocity and reaches a peak value at this stage; 2) transforming stage, sand particles start to be eroded by water, and result into a turbidity current layer above the soil-water interface. At this stage, the impact force decreases to a minimum value; 3) turbidity current stage, all of the sand particles are eroded by water, and the impact force increases again when increasing the velocity continuously.