Deep sea seabed parameter inversion method based on seabed reverberation and transmission loss

Abstract

The invention provides a deep sea seabed parameter inversion method based on seabed reverberation and transmission loss so as to effectively acquire seabed parameters in a deep sea environment. The method comprises the following steps: firstly, placing a single hydrophone in water; transmitting a sound source signal while a ship sails in an investigated and surveyed sea region; acquiring deep sea experimental data; extracting seabed reverberation and transmission loss experimental data; carrying out modeling and simulation on seabed reverberation model; matching the experimental data with a model simulated seabed reverberation time sequence; inverting to obtain sound velocity and density of the seabed; calculating transmission loss by using a ray model and matching the transmission loss with an experimental value; and inverting to obtain a seabed attenuation coefficient. The invention aims to provide an effective technical method for acquiring deep sea seabed parameters.

Description

technical field [0001] The invention relates to a method for inverting deep seabed parameters by using seabed reverberation and propagation loss, which is suitable for deep sea environment and belongs to the fields of underwater acoustic engineering, marine engineering, sonar technology and the like. Background technique [0002] In the deep sea environment, the acoustic characteristic parameters of the seabed (such as seabed sound velocity, density and attenuation coefficient) play an important role in sound propagation. The difficulty and cost of deep-sea in-situ measurement and seabed sampling increase, and often only local seabed parameters can be obtained, while large-scale seabed sampling is almost impossible in the deep-sea environment. Therefore, there are limited methods to obtain deep seabed parameters, and the inversion of seabed geoacoustic parameters is one of the feasible means. A variety of methods have been used for the inversion of geoacoustic parameters, s...

AI Technical Summary

Problems solved by technology

The inversion of normal wave modal dispersion characteristics can obtain high-resolution seafloor parameters, but this characteristic is not obvious in deep sea environments, and the near-field calculation of normal wave models is inaccurate when the water depth is large

Based on the inversion of seafloor reflection loss, the layered thickness, density and sound velocity of the seafloor can be retrieved with high resolution, but it is not sensitive to the seafloor attenuation coefficient

Due to the different sound propagation characteristics, many geoacoustic inversion methods in shallow seas are no longer applicable in deep seas, and none of the inversion methods can simultaneously invert the seabed sound velocity, density and attenuation coefficient

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