ASA 124th Meeting New Orleans 1992 October

1aUW14. Environmental noise in the parabolic equation.

C. David Rees

Ocean & Atmospheric Sci. Div., Code 541, NCCOSC RDT&E Div. NRaD), San Diego, CA 92152-5000

It is desirable to develop a theoretically rigorous, numerically efficient technique for treating the problem of oceanic noise fields generated by extended environmental noise sources (ocean wave fields, rainfall, icefields, seismicity, etc.) in general environments. The tensor Green's function technique originally developed by Kuperman and Ingenito [W. A. Kuperman and F. Ingenito, J. Acoust. Soc. Am. 67, 1988--1996 (1980)] for a range-independent (normal mode) environment provides a guide to developing a rigorous formalism using the parabolic equation (PE) approach for range-dependent environments. The theory and technique developed is described and numerical results are shown. Intrinsic difficulties arising from the PE forward-only assumption are pointed out and techniques to overcome this problem are presented. [Work supported by NRaD-Independent Research.]