UACE2017 Proceedings: Study on underwater acoustic channel characteristics of ice cover

Session:
Acoustics in polar environments
Paper:
Study on underwater acoustic channel characteristics of ice cover
Author(s):
Wenjian Chen, Siwei Hu, Jingwei Yin, Shuang Yin, Shengyu Tang
Abstract:
This paper aims to study the characteristics of underwater acoustic channel beneath ice-snow layer using acoustic reflection model of fluctuation ice layer. The Air-snow-ice-water model is established by simplifying the single ice layer into homogeneous elastic body. The influence of plane snow-ice layer on sound wave is analyzed. The typical ice rough surface under given statistical parameters is established, which is obtained with a Monte Carlo technique. Snow and ice thickness and frequency effects on reflection coefficient are analyzed. Compared with different thickness of snow and ice and different frequencies, the characteristics of underwater acoustic channel are analyzed. The results show that the reflection coefficient of plane ice-snow layer is only related to incidence angle in high frequency and thick ice area. The reflection coefficient is about 0.38 when the incidence angle is less than specific angle, which is only related to the critical angle of longitudinal wave in ice layer. Under typical sound speed gradient, with the scattering influence, the multipath interference of rough ice appears significantly at closer distance, while the arrival sound rays are less and the energy intensity is less.
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Contact person:
Ms Siwei Hu
e-mail:
Affiliation:
College of Underwater Acoustic Engineering,Harbin Engineering University
Country:
China