Multipath structure of the typical under-ice sound channel in the Arctic:theory and experiment

作     者：LIU Chonglei HUANG Haining YIN Li LIU Na WEI Chonghua LI Qihu 

作者机构：Institute of Acoustics Chinese Academy of Sciences University of Chinese Academy of Science The First Institute of OceanographySOA 

出 版 物：《Chinese Journal of Acoustics》 (声学学报（英文版）)

年 卷 期：2019年第38卷第1期

页      面：21-34页

核心收录：

学科分类：07[理学] 0702[理学-物理学] 

基　　金：supported by the Key Program of Chinese Academy of Sciences(QYZDY-SSW-JSC043) 

主　　题：Arctic Multipath structure typical under-ice sound channel 

摘      要：Considering the typical acoustic environment of the Arctic, this paper proposes a method based on OASES-Bellhop coupled model to rapidly analyze the multipath structure of the under-ice sound channel. Firstly the proposed model refers to ice plate as stratified elastic media with some roughness. Secondly,it uses the perturbation method and Kirchhoff approximation theory to solve the scattering loss due to the sea ice inhomogeneity. Finally, the model predicts the multipath structure of the under-ice channel through Ray theory. The results of the numerical simulation and experiment indicate that the typical Arctic sound channel presents multipath structures due to the sea ice and seabed in the range of 6 km, *** sea ice reflection paths are stable,with a short multipath spread within 14 ms. The seabed reflection paths have relatively weak strength. The proposed OASES-Bellhop coupled model successfully predicts the amplitude and delay of the multipath structure with small error,which indicates the proposed model is able to analyze and predict the multipath structure of the observed acoustic environment in experiment.