A device for in-situ observation of seabed sand waves based on internal solitary waves and its working method

Abstract

The invention provides a seabed sand wave in-situ observation device based on internal solitary waves and a working method of the seabed sand wave in-situ observation device. The seabed sand wave in-situ 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 an acoustic probe rod, an acoustic probe rod storage unit, a circular-truncated-cone-shaped limiting block, an one-way limiting device, a horizontal supporting rod, a resistivity probe rod, an electrode ring, a transmitting transducer, afirst penetration conical tip, a receiving transducer, a horizontal supporting rod and a second penetration conical tip. The stabilizing system is composed of a four-foot-frame limiting cylinder, a circular pipe, a stabilizing circular ring, a buffer device and a gravity anchor. By means of the seabed sand wave in-situ observation device, the penetration requirement of the seabed sand wave in-situobservation device is met, the penetration effect is guaranteed, the energy of the internal solitary waves is used as a resource, the design and operation cost of the device is reduced, and the seabed sand waves can be observed in situ in real time.

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 sand wave in-situ observation device based on internal solitary waves and a working method thereof. Background technique [0002] Submarine sand wave is a mound-shaped and crescent-shaped submarine landform developed under the action of ocean waves, tides, currents and other hydrodynamic forces, and its ridge line is perpendicular to the direction of the main current. As an active landform, the migration of seabed sand waves will cause accidents such as suspension and breakage of submarine pipelines, silting of channels, and structural instability of oil and gas platforms, which pose a serious threat to the safety of engineering facilities in the ocean. Therefore, the study of seabed sand waves has great significance. Internal solitary wave is a special kind of nonlinear internal wave, which occurs between...

AI Technical Summary

Problems solved by technology

At regular intervals, acoustic instruments such as multi-beam and side-scan sonar are used to repeatedly measure the depth of the seabed sand wave, and the migration observation of the seabed sand wave is realized through the change of the water depth and the comparison of the profile, but this method is inefficient and expensive. Moreover, the obtained data are discontinuous, and in-situ real-time observation of seabed sand waves cannot be realized

From the analysis of retrieved public data, it is found that: an accurate detection method for large and complex sand wave landforms on the seabed (patent number: CN2013103117430.1) and a detection method for seabed sand wave landforms based on MBES (patent number: CN201310317429.9) are both The current mainstream method is to use a multi-beam bathymetry system to observe the migration of seabed sand waves, which cannot achieve long-term in-situ real-time observation

The device and method for in-situ real-time observation of seabed sand waves (patent number: CN201710693750.5) and the device and method for observing seabed sand wave migration based on pressure gauges (patent number: CN201611223091.0) both realize in-situ, Real-time and continuous observation is to invert the change of sand wave height through the change of water pressure, but the penetration requirement of the observation device is based on the weight of the device itself, and the complex environment of the seabed cannot guarantee the penetration effect, and the error of the obtained data is relatively large

Images