Method for extracting characteristics of internal solitary waves in strong layered fluids in laboratory

Abstract

The invention provides a method for extracting characteristics of internal solitary waves in strong layered fluids in a laboratory. The characteristics of the internal solitary waves comprise the amplitude, waveform and wave velocity of the internal solitary waves, and a flow field of the internal solitary waves. Measuring of the amplitude, waveform and wave velocity of the internal solitary wavesspecifically comprises the following steps: the lower-layer fluid, a coloring agent and the upper-layer fluid are added into an experimental water tank in sequence; the internal solitary waves are generated, and sampling is conducted through a CCD camera; and the amplitude, waveform and wave velocity of the internal solitary waves are obtained through image processing. Extracting of the flow field of the internal solitary waves specifically comprises the following steps: the lower-layer fluid, tracking particles and the upper-layer fluid added with the particles are added into the experimental water tank in sequence; the CCD camera and a laser are arranged; a polarizer is mounted in front of a lens of the CCD camera; the internal solitary waves are generated, and sampling is conducted through the CCD camera; and the flow field of the internal solitary waves is obtained through MATLAB image processing. The problems that as for an existing laboratory internal wave measurement technology, equipment interference exists, workload of post-treatment is large, and the resolution ratio is low are solved.

Description

technical field [0001] The invention relates to the technical field of marine engineering, in particular to a method for extracting internal solitary wave characteristics in a strongly stratified fluid in a laboratory. Background technique [0002] Internal waves are fluctuations that occur between layers of inhomogeneous water such as density and temperature inside the ocean. Since internal waves occur inside the ocean, they are not easily observed, yet such disturbances are ubiquitous in the ocean. The amplitude of the internal wave can reach hundreds of meters. The shear flow generated by the internal wave has a strong destructive effect on marine structures. Similarly, the internal wave will change the propagation path of the acoustic signal in the ocean. Therefore, it is very important to study the generation and propagation mechanism of internal waves. [0003] There are three main research methods of internal waves, field observation, numerical simulation and experi...

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Problems solved by technology

[0004] According to the problems of equipment interference, large post-processing workload and low resolution in the existing laboratory internal wave measurement technology proposed above, a method for laboratory extraction of internal solitary wave characteristics in strongly stratified fluids is provided.

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