基于简化海底模型的浅海环境噪声垂直指向性及参数反演

提出了一种以简化海底模型为基础的浅海环境噪声垂直指向性的计算方法,并用于海底参数反演。小掠射角时,采用简正波法;大掠射角时,采用虚源法。数值仿真结果与经典的K/I噪声模型相近;分析某浅水区的一次噪声试验数据,提出分段反演方法,并将反演得到的参数较好的用于噪声场强度预报。结果表明,该方法引入的简化海底模型,能反映出海底反射对噪声场垂直指向性的影响,但由于不需要精确的海底分层结构,便于理论分析声场。

Vertical directionality of ambient noise in shallow-water based on the simplified bottom model and its application on parameters inversion

According to a simplified bottom model,the vertical directionality of ambient noise was calculated in shallow water,and geo-acoustic parameters were estimated subsequently.The image method and the normal mode method were used at larger and smaller angles,respectively.The simulation results of the vertical directionality were in good agreement with the K/I noise model.A segmentation inversion scheme was proposed based on the analysis of noise data in shallow water,and then the noise intensity calculated using inverted parameters coincided with measurements at the same site. It was demonstrated that this method could describe the effects of bottom reflection on the vertical directionality of ambient noise,though the simplified bottom model was used.In addition,it was convenient to analysis the noise filed for the accurate layered structure could be neglected.