On the Estimation of Long Range Sound Intensities by Ray Trace Methods.
Technical note no. 3,
METEOROLOGY INTERNATIONAL INC MONTEREY CALIF
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The problem of calculating ray trace intensities at short range is relatively simple when a few particular ray paths from the source to the receiver are known. Our interest here is in the larger ranges, i.e., ranges much greater than the skip distances. Diffraction, scattering and the changes of the velocity profiles over the large range make it convenient, even a necessity, to regard the ray paths as being distributed over a region of the ocean. To avoid argument, it is agreed that the particular ray paths from a source position to a receiver position, regardless of the ray, can be calculated for a sound velocity profile over the path. Temporal changes and lack of exact knowledge of the sound velocity profile make this deterministic problem a futile exercise. The ray tracing procedure will be used primarily to determine the aperture at the source and the distribution of the energy in the region of the receiver. Hence, the average sound intensity can only be estimated.