Intra-annual variability of acoustic characteristics of the coastal waters off Cochin

A.G. Bhasker, K.S.N. Namboodiripad, P.G. Kurup


Intra-annual variability of acoustic propagation characteristics of the coastal waters off Cochin is reported. The sharp negative sound velocity gradients in the surface layers upto 20 m depth and the almost negligible gradients in the deeper layers during monsoon and post-monsoon seasons suggest very small horizontal detection ranges in the surface layers and long ranges below 20 m using an acoustic beam. The positive and slightly negative sound velocity gradients found during winter and summer respectively indicate the possibility of comparatively longer ranges of detection during these seasons, the former season being more favourable


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