ASA 128th Meeting - Austin, Texas - 1994 Nov 28 .. Dec 02

5pUW11. A time-dependent solution of a wave traversing a wedge by a finite length ping ray trace technique.

Elmer White

Naval Res. Lab., Stennis Space Center, MS

130 Moonraker Dr., Slidell, LA 70458

A technique has been developed which demonstrates that an acoustic wave can be simulated using modified ray trace theory for acoustic modeling in shallow water. The resulting time-dependent wave and the transmission loss data closely compares to that benchmarked in the PE Workshop II Proceedings of the Second Parabolic Equation Workshop published in May 1993, edited by S. A. Chin-Bing, D. B. King, J. A. Davis, and R. B. Evans. The solution approximating test case 2, a range-dependent environment demonstrates forward and backscatter characteristics which agree with both PE and normal-mode theory in its behavior patterns. A VCR composite of time images generated by the code trng.f will be shown which demonstrates the sound wave pattern as it traverses a wedge. Transmission loss data are compared to PE generated TL to verify its accuracy.