考虑噪声源深度分布的海洋环境噪声模型及地声参数反演

发布时间：2018-06-24 21:35

本文选题：环境噪声源 + 深度分布　；参考：《物理学报》2017年01期

【摘要】：考虑到海洋环境噪声源深度分布不集中,建立了噪声源随深度分布的海洋环境噪声模型,分析了源深度对噪声场垂向特征的影响并从简正波角度予以解释,发现海底声阻抗和声源深度都显著影响由海洋环境噪声获得的等效海底反射损失大掠射角部分,进而将该模型用于地声参数反演.两段实测噪声数据200—525 Hz频段的反演结果表明:基于海洋环境噪声的地声参数反演最优值与声传播的反演结果相近;源平均深度最优值随频率增加有变小的趋势,说明随频率增加环境噪声主要贡献源逐渐由航船转为风浪;当海况大于3级时,400 Hz以上频段噪声源深度平均值很小,与Monahan气泡理论的描述一致.
[Abstract]:Considering that the depth distribution of noise sources in marine environment is not concentrated, a noise model with depth distribution is established, and the influence of source depth on vertical characteristics of noise field is analyzed and explained from the perspective of normal wave. It is found that both the acoustic impedance and the depth of the sound source significantly affect the large grazing angle of the equivalent seabed reflection loss obtained from the marine ambient noise, and the model is applied to the inversion of the acoustic parameters in the ground. The inversion results of two measured noise data in the 200-525 Hz band show that the optimum value of acoustic parameters inversion based on marine environmental noise is close to that of acoustic propagation, and the optimum value of source average depth tends to decrease with the increase of frequency. It is shown that the main source of environmental noise changes from ship to wind with increasing frequency, and the mean depth of noise source above 400 Hz is very small when the sea condition is greater than 3, which is consistent with Monahan's bubble theory.
【作者单位】：中国科学院声学研究所北海研究站;中国科学院水声环境特性重点实验室;
【基金】：国家自然科学基金(批准号:11174314) 中船重工715所重点实验室开放基金(合同号:KF201502)资助的课题~~
【分类号】：P733.22

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