Research On Seafloor Seismic Wave Generated By Several Typical Seismic Sources

As a new type of ship physical fields,Underwater ship seismic wave field has the special transmission mechanism.In some certain circumstances,it can make up for the shortage of the conventional acoustic detection ability and enhance the ability to identify the target vessel,which received the widespread attention in recent years.In this paper,based on the mechanism of the seafloor seismic wave propagation in saturated porous media,from several typical wave sources can cause seismic wave in the seafloor,and the mechanism of the seafloor seismic wave caused by the source of the sea surface wave noise,the noise source of the ship and the submarine micro seismic noise source are discussed respectively.The characteristics of several kinds of noise sources are analyzed and discussed,and the corresponding theoretical models are established.Ship seismic wave is of great significance for the long distance detection of ships,so we mainly study the related characteristics of the seismic wave induced by the ship in this paper.The finite element simulation analysis of different seismic sources is made by using COMSOL Multiphysics software,revealing the coupling effect of several typical seismic wave sources and the seafloor,and the signal characteristics of the different components of the seafloor seismic waves are obtained.This paper presents a complete measurement test scheme of seafloor seismic wave induced by several typical seismic wave sources,and part of which has carried out.Through the analysis of the measured data analysis,including time domain,frequency domain and time-frequency method,the seafloor seismic wave frequency characteristics induced by several typical seismic wave sources are obtained.And the wavelet threshold denoising method is used to process the data,and the noise reduction results are compared,and a better noise reduction method is obtained.Finally,the results of simulation and experimental data analysis are summarized,and the development direction of the future research and application of seafloor seismic wave is presented.