Ocean acoustic wave propagation and ray method correspondence: Internal wave fine structure .

Acoustic wave fields propagating long ranges through the ocean are refracted by the inhomogeneities in the oceans sound speed profile. Intuitively, for a given acoustic source frequency, the inhomogeneities become ineffective at refracting the field beyond a certain fine scale determined by the acoustic wavelength. On the other hand, ray methods are sensitive to infinitely fine features. Thus, it is possible to complicate arbitrarily the ray dynamics, and yet have the wave field propagate unchanged. This feature raises doubts about the ray/wave correspondence. Given the importance of various analyses relying on ray methods, a proper model should, at a minimum, exclude all of the fine structure that does not significantly alter the propagated wave field when the correspondence to the ray dynamics is integral. We develop a simple, efficient, smoothing technique to be applied to the inhomogeneitiesa low pass filtering performed in the spatial domainand give a characterization of its necessary extent as a function of acoustic source frequency. We indicate how the smoothing improves the ray/wave correspondence, and show that the so-called ray chaos problem remains above a very low frequency (~1525?Hz). 2005 Acoustical Society of America. [ABSTRACT FROM AUTHOR]