ASA 129th Meeting - Washington, DC - 1995 May 30 .. Jun 06

4pUW9. Effects of azimuthal coupling on bistatic reverberation.

Kevin B. Smith

Dept. of Phys., Code PH/Sk, Naval Postgrad. School, Monterey, CA 93943

William S. Hodgkiss

Scripps Inst. of Oceanogr., La Jolla, CA

Frederick D. Tappert

Univ. of Miami, Miami, FL

The University of Miami PE (UMPE) model [K. B. Smith and F. D. Tappert, MPL Tech. Memo. 432 (1993)] has been upgraded to include azimuthal coupling, making it a fully three-dimensional forward propagation model. By incorporating Tappert's PE reverberation (PEREV) model [F. D. Tappert, J. Acoust. Soc. Am. Suppl. 1 88, S84 (1990)], the effects of azimuthal coupling on bottom reverberation can be examined. During the July 1993 ONR-ARSRP main acoustics cruise, extensive bistatic data were recorded. using bathymetric data from the ARSRP Natural Laboratory, predictions of bistatic reverberation are made with and without azimuthal coupling. Differences between these two calculations provide quantitative evidence of azimuthal coupling effects. Comparisons with measured data will also be presented. [Work supported by ONR, Code 321OA.]