Preliminary Investigation of Optimum Frequency for Sound Propagation in Shallow Sound Channels.
NAVAL POSTGRADUATE SCHOOL MONTEREY CA
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Optimum frequency for propagation of sound in shallow sound channels was studied using two acoustic transmission loss models. The split step Parabolic Equation model a full wave model and the Fast Asympotic Coherent Transmission loss model, version 9H a ray tracing model were tested against experimental data collected in the northeast Pacific Ocean. The models were found to be valid predictors of optimum frequency for the shallow sound channel. Both models were then used to predict optimum frequency for two sound velocity profiles obtained in a high latitude deep ocean basin under summer conditions exhibiting shallow sound channels. As expected, the split step Parabolic Equation PE model adequately predicted optimum frequencies for these cases. The Fast Asymptotic Coherent Transmission loss model, version 9H FACT 9H model did not produce reasonable results for optimum frequencies.