Experimental analysis of pore pressure characteristics of slope sediments by shoaling internal solitary waves

Qiao Luzheng; Guo Xiujun; Tian Zhuangcai; Yu Le

doi:10.3969/j.issn.0253-4193.2018.01.008

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Qiao Luzheng, Guo Xiujun, Tian Zhuangcai, Yu Le. Experimental analysis of pore pressure characteristics of slope sediments by shoaling internal solitary waves[J]. Haiyang Xuebao, 2018, 40(1): 68-76. doi: 10.3969/j.issn.0253-4193.2018.01.008

Citation:

Qiao Luzheng, Guo Xiujun, Tian Zhuangcai, Yu Le. Experimental analysis of pore pressure characteristics of slope sediments by shoaling internal solitary waves[J]. Haiyang Xuebao, 2018, 40(1): 68-76. doi: 10.3969/j.issn.0253-4193.2018.01.008

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Experimental analysis of pore pressure characteristics of slope sediments by shoaling internal solitary waves

doi: 10.3969/j.issn.0253-4193.2018.01.008

1.
College of Environmental Science and Engineering, Ocean University of China, Qingdao 266100, China
2.
College of Environmental Science and Engineering, Ocean University of China, Qingdao 266100, China;Shandong Provincial Key Laboratory of Marine Environment and Geological Engineering, Qingdao 266100, China

Received Date: 2017-06-29

Abstract

Abstract

Observation shows that the effect of the internal solitary waves (ISWs) along the slope on the seabed sediments is like a water cleaner, which is the strongest in the crushing phase and even triggers a series of geological activities and disasters. In order to define the dynamic capability and influencing factors of the ISWs in the process, continuous interaction between the different amplitudes solitons and the different types of sediments was simulated in the large gravity stratified flow tank. The changes of pore water pressure in the process were recorded by the pore water pressure acquisition system. The pore pressure in sediments were compared and analyzed under different hydrodynamic, slope and sedimentary types. The results show that there are similar "U" negative excess pore water pressure changes in the process of wave breaking in different wave broken points. The location waves passing through shows a pore pressure response and it is positively correlated with the surface wave pressure. The amplitude of the excess pore water pressure with depth at the solitary wave broken point, which is reduced to about 50% at about 6% of the wavelength. The amplitude of pore pressure is related to sediment type and wave amplitude. When the slope changes from 0.071 to 0.160, the wave pressure amplitude can be increased to 1.6 times. The change of the amplitude of the solitary wave is only related to the excess pore water pressure value, which does not affect the dynamic response of the seabed.
- internal solitary waves,
- broken conversion,
- excess pore water pressure,
- influencing factors

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References(18)

References

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