Abstract
A prediction system is developed for computing geometrical spreading loss. The system is applicable to all underwater-sound transmissions generated by nonvertexing rays. The prediction system has the advantage of being able to: (1) generate the complete spectrum of values for geometrical spreading loss in a large oceanographic area over an annual time period; (2) index the predicted contours with two indices; (3) provide a maximum error bound on the difference between a predicted value and the value that would be obtained by a detailed sound-ray calculation; and (4) use the computed errors to delineate the oceanographic area in which the predictions are valid. The prediction system, or model, is used to obtain all contours of geometrical spreading loss that can be associated with the North American Basin. The errors in these predictions are generally less than ±1 dB for ranges out to 55 kyd.
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