An analysis of acoustic propagation characteristics of dual-duct waveguide in the Arctic
The special dual-duct sound speed structure significantly affects underwater sound propagation in the Beaufort Sea of the Arctic.Utilizing data from the 9th Arctic Scientific Expedition,this paper studies the sound propagation characteristics of the dual-duct waveguide,focusing on analyzing the mechanism of the remarkable sound capture capability of the Beaufort duct.The findings reveal that at sufficiently high source frequencies,cer-tain modes will be captured in the Beaufort duct.These trapped modes will not be affected by sea ice or the sea-floor,resulting in minimal energy loss.When the sound source is located within the duct,the excited captured modes facilitate long-distance sound propagation.Additionally,the acoustic characteristics of these captured modes depend solely on variations in sound speed in the Beaufort duct,ensuring their stable propagation in the sound field and the formation of stable interference structures.
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