Multi-sending and multi-receiving acoustic measurement method for oceanic internal waves

Abstract

The invention relates to a multi-sending and multi-receiving acoustic measurement method for oceanic internal waves. According to the method, sound wave signals with frequency bands are sent through an internal wave measurement device, travel time of the sound wave signals with the frequency bands in the vertical direction in seawater is measured, after influences of a factor of background environmental is removed, echo time disturbance is obtained and combined with dynamics property of the internal waves, the relation between the echo time disturbance and the amplitude of the internal waves is built, so that change of crucial hydrology parameters such as temperature, salinity and flow rate of whole water depth caused by the internal waves is obtained, and therefore the purpose of observation on the oceanic internal waves is achieved. The multi-sending and multi-receiving acoustic measurement method for the oceanic internal waves can be widely used for the observation on the oceanic internal waves, particularly for the observation on internal waves in a deep sea.

Description

Technical field [0001] The invention relates to a method for measuring ocean internal waves, and in particular to a multi-transmit and multi-receive acoustic method for measuring ocean internal waves. Background technique [0002] Internal ocean waves are interface waves formed within seawater due to differences in density in the vertical direction. Since the less dense seawater in the ocean is on top and the denser water is on the bottom, there is an obvious density stratification in the vertical direction. Disturbance from the external environment, such as tides, wind and other factors, will cause corresponding fluctuations on the isopycnal surface of the density layer, that is, internal waves. Observation means are one of the main factors restricting the development of modern internal wave research. Although satellite observation can provide a wide range of horizontal images, it cannot directly and continuously observe the internal structure of seawater, and its inversi...

AI Technical Summary

Problems solved by technology

[0003] In view of the above problems, the object of the present invention is to provide a multi-transmission and multi-reception method for acoustically measuring ocean internal waves. The method observes internal waves on-site by emitting intermediate frequency sound waves, which can effectively overcome the large cost and observation problems existing in traditional internal wave observations. Disadvantages such as small range and single observation variable

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