Seabed pore water pressure observation device based on internal solitary waves and working method thereof

Abstract

The invention provides a seabed pore water pressure observation device based on internal solitary waves and a working method thereof. The seabed pore water pressure observation device comprises a penetration power system, an observation system and a stabilization system. The penetration power system is composed of a recovery ring, a buoy, a Kevlar cable, a limiting cylinder, a cubic limiting block, a control unit, an annular control cabin, a heavy block and an annular iron block. The observation system is composed of a first pore pressure feeler lever, a pore pressure feeler lever storage unit, a circular-truncated-cone-shaped limiting block, a one-way limiting device, a horizontal supporting rod, a second pore pressure feeler lever, a first penetration conical tip, a pore pressure sensor,a second penetration conical tip and an annular lantern ring.According to the invention, the penetration requirement of the in-situ observation device for seabed pore pressure under the action of internal solitary waves is met; the penetration effect is guaranteed, the energy of the internal solitary waves can be used as a resource, the design and operation cost of the device is reduced, and therequirement for real-time and in-situ observation of pore water pressure changes in a seabed under the action of the internal solitary waves can be met.

Description

technical field [0001] The invention relates to the technical field of seabed observation and the technical field of marine engineering geology, in particular to a seabed pore water pressure observation device based on internal solitary waves and a working method thereof. Background technique [0002] Internal ocean waves are common fluctuations that occur in density-stabilized seawater. Internal solitary waves with strong effects are usually excited and formed when strong currents flow through continental slopes and sea ridges with large seabed topography. The internal solitary wave is a special nonlinear internal wave. When the internal solitary wave propagates, the stress field and pore water pressure in the seabed will fluctuate during the wave-soil interaction process. With the increase of excess static pore water pressure and the decrease of vertical effective stress, the sediment strength of the shallow surface layer of the seabed will also change, which will lead to ...

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Problems solved by technology

[0003] Due to the lack of in-situ observation data for modeling and verification, although the research on the seabed pore water pressure response caused by internal solitary waves has been carried out earlier, the progress is slow, and it is still in the stage of theoretical analysis. Generally, it is based on linear surface waves and internal waves. The double-layer fluid system and the infinite depth poroelastic seabed model, combined with the two-dimensional Boit consolidation theory, use the analytical method to solve the pore water pressure value of the seabed response caused by internal solitary waves

However, due to the limitation of existing technical means, the numerical simulation is still unable to simulate the more complex reality. Therefore, the in-situ observation of the generation and development of seabed pore water pressure under the action of internal solitary waves needs to be solved urgently.

[0004] At present, the in-situ observation of pore water pressure in seabed sediments mainly relies on geophysics, pore pressure static sounding, pore pressure probes and other means, but these cannot be aimed at the generation and development of pore water pressure caused by internal solitary waves in situ monitoring of the process

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