Marine environment Noise Model considering depth distribution of noise sources andInversion of ground acoustic parameters

Abstract

taking into account that the depth distribution of noise sources in the marine environment is not concentrated , The establishes a noise model of the marine environment with the depth distribution of the noise source , The analyzes the source depth affects the vertical characteristics of the noise field and interprets it from a normal perspective , It is found that the submarine acoustic impedance and the depth of the source have significant effects on the ocean environment Noise . For the equivalent underwater reflection loss large sweep angle section , The further uses the model for inversion of the acoustic parameters . Two-segment measured noise data 200-525 Hz The inversion result of the band indicates that the : The inversion of the optimal value of acoustic parameters and sound propagation based on the marine ambient noise is similar to that of the AE. ; Source Average depth is optimal values decrease with frequency , It is indicated that the main contribution source of ambient noise with frequency is gradually changed from ship to Wave .; when sea condition is greater than 3 level , all Hz Above frequency band noise source depth average is very small , with Monahan The description of the bubble theory is consistent .