ASA 127th Meeting M.I.T. 1994 June 6-10

3aUW4. A fast Green's function method for one-way sound propagation in the ocean.

Rodney R. Korte

Kenneth E. Gilbert

Appl. Res. Lab. and the Graduate Prog. in Acoust., Penn State Univ., P.O. Box 30, State College, PA 16804

A Green's function method recently developed for atmospheric sound propagation [K. E. Gilbert and X. Di, J. Acoust. Soc. Am. 94, 2343--2352 (1993)] is used to derive a fast, general algorithm for one-way sound propagation in the ocean. In this paper the method is applied to sound propagation in an ocean with angle-dependent surface loss. The results provide a rigorous solution to the problem treated heuristically by M. E. Moore-Head et al. [J. Acoust. Soc. Am. 86, 247--251 (1989)]. Within the context of an effective reflection coefficient for specular reflection from a rough surface, the present method is exact and can be applied without regard to the water depth or the frequency. Selected numerical examples are presented to demonstrate the effect of angle-dependent surface loss on shallow-water propagation.