* Seasonal sound profiles are used to perform ray tracing considering both range independent and range dependent environments,. * The number of eigen rays increase with the source-receiver range. For an optimum range of 300 km, 15 to 20 useful rays exist. Number of rays increase according to the ratio R/200. * For a propagation range of 300 km, the arrivals spread over a time span of about 400 ms in the Arabian Sea and much less (〜110 ms) in the Bay of Bengal. * Eigen ray estimations revealed that for the case of an up slope (down slope) propagatron higher number '22' (lower number '3') of rays reach the receiver. * The computed acoustic losses due to spreading, range between 90 and 120 dB while the chemicai absorption losses account for about 4.5 dB. * Simulation of acoustic propagation over a range of 7000 km (Cape Leeuwin - Madras) path reveaied that acoustic pulse would take about 70 minutes to reach the receiver. It will undergo a transmission loss between 100 and 120 dB. In addition, the facilities available at this institute to carry out remotely sensed satellite data on sea surface temperature, sea surface height and other numerical studies on the circulation augmenting the acoustic oceanography are highlighted.
