Seabed sand wave long-term observation device and method applied to internal wave development area

Abstract

The invention relates to the field of seabed observation, and particularly relates to a seabed sand wave long-term observation device and method applied to an internal wave development area. A supporting mechanism is in the shape of a balance and comprises a gravity anchor, hexagonal rods, an annular instrument control cabin and supporting rods, the gravity anchor is positioned at the bottom of the whole device, the gravity anchor is connected with the annular instrument control cabin above the gravity anchor through a plurality of hexagonal rods, an internal wave energy power generation mechanism is arranged in the annular instrument control cabin, two supporting rods are symmetrically fixed on the outer side of the annular instrument control cabin, one supporting rod is connected with amultifunctional observation rod through a mechanical grabbing ring at the end of the supporting rod, the other supporting rod is connected with a sandy sediment sampling rod through a mechanical grabbing ring at the end of the supporting rod, and the top of the annular instrument control cabin is connected with a subsurface buoy at a seawater boundary layer through a Kevlar cable. Ocean internal wave energy is fully utilized, long-term in-situ observation of seabed sand waves is achieved, the observation result is accurate and reliable, the observation cost is low, and collection and recoveryof seabed sand wave soil samples are achieved.

Description

technical field [0001] The invention relates to the field of seabed observation, in particular to a seabed sand wave long-term observation device and observation method applied to an internal wave development area. Background technique [0002] my country's South China Sea area has complex geological conditions and significant seawater density stratification, which is a natural frequent occurrence area of ​​solitary waves in the ocean. Internal waves in this sea area not only appear in the form of solitary waves, but also in the form of internal tidal waves. The maximum amplitude observed so far can reach 240m, which contains huge energy. When it propagates at the interface of seawater density stratification, it will cause a large amount of vertical movement of water bodies and sediments. This process will often form landforms such as submarine sand waves on the seabed. Because of this, there are a large number of oceanic inner slopes in the northern part of the South my cou...

AI Technical Summary

Problems solved by technology

[0004] However, due to the high penetration intensity of the sandy seabed, the sampling column in the existing gravity sampling device is difficult to penetrate, so it is difficult to complete the sampling work by gravity sampling; and the box sampler and the clam sampler cannot collect the inside of the seabed When taking samples from the surface of the seabed, due to the effect of sand and gravel, it is difficult to completely close, and sand leakage often occurs. At present, there is no sampling device that can effectively obtain the profile information of the sediment inside the sandy seabed, and the above-mentioned patent does not solve the problem. This problem also leads to the lack of data support for sediment buoyant density, particle size, porosity and other properties in actual observations, which leads to the inversion of sand wave by the change of overlying sediment weight or sediment resistivity. The error is large when the elevation changes

[0005] In addition, due to the slow migration rate and long cycle of seabed sand waves, the bottom observation platform needs to observe such phenomena for several months or even years, which consumes a huge amount of electric energy, which is also a problem The construction of submarine observation platforms has been a problem for many years, and the above-mentioned patents have failed to propose a solution to this problem

Images