Simulation Of Underwater Sound Field Characteristics And Sonar Application In Atoll Area

The distribution of coral reefs in the South China Sea has been paid more attention by marine environmental scientists.Therefore,the distribution law of coral reefs in the South China Sea is the main scientific fulcrum of coral reefs in China.The complex seabed topography and unique sediment properties in coral atoll area lead to the complex underwater sound field structure in coral atoll area.Due to the lack of data in coral atoll area,the research on the distribution law of underwater sound field and its environmental impact effect in coral atoll area is not deep enough.In view of this,a typical atoll in the South China Sea is selected as the research target in this paper.Using the newly obtained marine environmental data,aiming at the key problem of underwater sound field distribution characteristics and environmental impact effects,the following studies are mainly carried out:Firstly,this paper constructs the data volume model of underwater environmental elements fusion in the study area,which mainly includes establishing a high-precision digital terrain model of the study area based on the measured multi beam sounding data;Based on the measured Argo data,the sound velocity profile of the water body in the study area is obtained by fusing the sound velocity value obtained from the empirical formula of temperature and salinity with the depth function;Based on the investigation and analysis of the material properties of seabed sediments in the study area,the sound velocity and sound attenuation coefficient of seabed shallow surface sediments are inversed and calculated by empirical formula.Secondly,this paper carries out the simulation analysis of the characteristics of underwater sound field and the influence effect of environmental information in the study area.Based on the acoustic calculation theory,the underwater sound propagation calculation model in the study area is constructed.Combined with the characteristics of measured environmental elements,the sound propagation loss and its variation law in different environmental backgrounds in the study area are simulated and analyzed.The research results show that there are certain distribution laws of underwater sound field under the topography of coral atoll shallow sea and coral atoll slope,Moreover,there are great differences in the change effects of marine environmental characteristics and sound source attributes of different coral atolls.Finally,the sonar application(detection ability,underwater acoustic channel,etc.)under the background of coral atoll slope is simulated in this paper.In this paper,the concepts of quality factor(FOM)and multipath ratio(SMR)are introduced as the key indexes to measure the performance of sonar in sonar detection and the quality of acoustic channel in information communication.By solving the variation law of quality factor(FOM)and multipath ratio(SMR)under the background of coral atoll slope.The optimal detection solution and optimal channel solution of sonar position in coral atoll environment are obtained,So as to provide a theoretical basis for improving the situation of marine information confrontation under the background of coral atoll.