Device and method for observing seabed sand wave migration based on piezometer

Abstract

The invention discloses a method and device for observing submarine sand wave migration based on a pressure meter. The device comprises an observation system and auxiliary equipment, wherein the auxiliary equipment comprises an auxiliary ship, a lifting device and the like; the observation system is integration of a fixed device, a period observation device and a wavelength observation device; the period observation device and the wavelength observation device are balls with holes, a water depth pressure meter, an MRU three-dimensional attitude sensor and a rotary sediment profile imager are fixed in each of the period observation device and the wavelength observation device; and the principle is measuring a time interval between adjacent water pressure with extreme values and wavelengths thereof and then calculating the migration rate of a submarine sand wave. The method comprises the steps of calibrating instruments indoors; positioning a target observation point by using the auxiliary ship and laying the observation system; and observing and recording the period and the wavelength of submarine sand wave migration through the period and wavelength observation system, thereby achieving observation of submarine sand wave migration. A novel idea and method is provided for observation of submarine sand wave migration, and the device and the method have the characteristics of being simple in operation step and long in in-situ measurement period, can be repeatedly utilized, and are suitable for long-term in-situ observation of shallow submarine sand wave migration.

Description

technical field [0001] The invention relates to a seabed sand wave migration observation device and method based on pressure gauge as the core technology, and belongs to the technical field of seabed observation and the field of marine engineering geology. Background technique [0002] Submarine sand wave is a highly active type of submarine landform, which is common and seriously harmful in global tidal current shelves, coasts, straits, bays, and shelf sea areas with directional flow velocity. Sand waves will migrate under the action of hydrodynamic conditions such as waves, tidal currents and internal waves, which is very likely to cause suspension or burial of submarine transportation pipelines and optical cables, and more seriously may lead to breakage of submarine transportation pipelines and optical cables, and offshore platforms. The inclination of the ocean will bring huge losses to the economy and the environment, so the observation and research on the migration of ...

AI Technical Summary

Problems solved by technology

This observation method is simple and intuitive, but its measurement times are many, the time is short and discontinuous, and it lacks in-situ observation means. The real distance of sand wave migration cannot be accurately judged from the intermittent data.

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