Abstract
In August of 1970, shallow-water attenuation measurements were conducted in Hudson Bay [“Sound Propagation and Reverberation Measurements in Hudson Bay,” paper N13 presented at 81st meeting of the Acoustical Society of America, J. Acoust. Sac. Amer. 50, 103 (A) (1971)]. The experimental results indicated that below 1 kHz, values for the attenuation coeffecient were considerably higher than those which would be predicted from Thorp's formula. One possible explanation for this anomaly was that the experimental values were affected by a significant bottom loss in addition to the attenuation loss in the water column. In order to obtain a better understanding of the governing factors, theoretical propagation loss predictions were made with the FFP. The model incorporates both a layered bottom and a complex wavenumber and the influence of each can be determined parametrically. It was found that at the frequencies of interest the bottom was not a significant factor and that the values of the theoretical attenuation coefficient, needed to match the FFP and experimental propagation-loss results, were in good agreement with the values determined experimentally.
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