ASA 124th Meeting New Orleans 1992 October

3aUW6. Three-dimensional global acoustic PE model.

Frederick Tappert

Appl. Marine Phys., RSMAS, Univ. of Miami, Miami, FL 33149

A fully three-dimensional PE/SSF global ocean acoustic model with 360-deg azimuthal coverage has been developed that predicts sound-pressure levels at all points in the world's oceans from a source that is omnidirectional in azimuth. Full coupling in both horizontal and vertical planes is included for the outgoing waves. A high angle propagator is used, that allows deflections up to nearly 90 deg in both vertical angle and azimuthal angle, giving a forward bistatic reverberation capability. Backward monostatic reverberation is provided by means of the multiple forward scatter single backscatter approximation, which weakly couples outgoing and incoming waves. Standard deterministic geophysical databases are used, and are supplemented by stochastic descriptions of surface, bottom, and sub-bottom interface roughness. [Work supported by ONR, Code 11250A.]