Transport Theory for Propagation and Reverberation
Technical Report,01 Jan 2013,31 Mar 2016
WASHINGTON UNIV SEATTLE SEATTLE United States
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There were two main goals proposed for this project. The first goal was test the accuracy of transport theory by making data-model comparisons with TREX13 reverberation results. The second goal was to use transport theory results to support the development of the TOTLOS model an effective reflection loss for the total field that will allow effects of sea surface forward scattering to be incorporated into standard ray-based, mode-based, or energy flux propagation and reverberation models. The stochastic process emphasized was forward scattering from the sea surface, which can affect predicted reverberation levels at mid frequencies by more than 10 dB. The results so far from TREX13 datamodel comparisons show the importance of properly accounting for surface forward scattering and the directional nature of the wave field in reverberation modeling. The attempt to account for these effects by converting from 3-D to 2-D with an approximate method that preserves the vertical distribution of scattering angles shows promise, but is not sufficiently accurate at this time. It should be noted that the TREX13 reverberation data were taken with relatively modest sea states, and at higher sea states these effects are predicted to be substantially greater.