Abstract

A set of propagation loss curves, extracted from measured reverberation in an environment with water depths of 200–250 ft is used to investigate the crossover region between deep and shallow water using two normal mode implementations designed to predict propagation in deep and shallow water, respectively. A third range-recursive calculation which is applicable in situations for which cycle mixing with range results in randomization of phase interference between modes is also used for comparison. The impact of forward boundary scattering on reproducing the measured levels at multiple receiver depths is demonstrated.

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