Sound channel
Sound channel the region in the water column where sound velocity first decreases to a minimum value with depth and then increases in value as a result of pressure above the minimum value sound rays are bent downward, and below the minimum value sound rays are bent upward, the rays are thus trapped in this chan- nel sound travelling in a deep channel can be detected thousands of miles from the sound
Source: http://www.iho.int/iho_pubs/standard/S-32/S-32-eng.pdf
Web site to visit: http://www.iho.int/
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