Abstract
The long-range propagation modes in an acoustic channel under ice are basically caused by supercritical incidence. The energy distribution and transmission loss in the acoustic channel under ice are changed by a scatter in ice. The influence of a slender cylindrical cavity near and parallel to the ice-water interface on the sound propagation is analyzed using Fourier-Bessel series and Sommerfeld-Watson transformation. The research found that the acoustic field presents a beam in the mirror reflection direction at supercritical incidence, and the beam-width is proportional to secant of incident angle; meanwhile, the reflected coefficient is proportional to cosine of incident angle. The reflection coefficient increases with relative depth and Helmholtz number if the incident angle is a constant.
Highlights
The Arctic region has important strategic significance and commercial value
The sound propagation characteristics in an acoustic channel under ice depend on the parameters of the ice canopy, which has a noticeable influence on the acoustic navigation and communication under ice [1, 2]
The ice canopy in current researches was considered as an ideal elastic layer on the macro scale, or its reflection coefficient was obtained through experiments to calculate the transmission loss, but the influence of microstructure in ice on the acoustic channel under ice has not been considered yet
Summary
The Arctic region has important strategic significance and commercial value. The sound propagation characteristics in an acoustic channel under ice depend on the parameters of the ice canopy, which has a noticeable influence on the acoustic navigation and communication under ice [1, 2]. The microstructure changes the attenuation of sound wave in the original propagation direction and the spatial distribution of acoustic energy under ice. it is of great significance to study the influence of microstructures in ice on the sound propagation characteristics in an acoustic channel under ice. Acoustic experimental researches in the Arctic region can be traced back to the last century [3]. The transmission loss of shallow source is very large because of the scattering of the ice-water mixed layer [9] and the signal can hardly be propagated for a long distance. The influence of a slender cylindrical cavity near and parallel to the ice-water interface on the acoustic propagation under ice is analyzed using the combination of Fourier-Bessel series and Sommerfeld-Watson transformation
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