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

5pUW8. Shallow-water time series simulation using normal-mode theory in range-independent and range-dependent environments.

Geoffrey S. Royal

David P. Knobles

Robert A. Koch

Appl. Res. Labs., Univ. of Texas at Austin, Austin, TX 78713

Broadband normal-mode model analyses of propagation in a shallow-water range-independent environment and in a wedge environment are presented. The model is first used to calculate received time series from a point source for a range invariant shallow-water acoustic environment with a constant water sound-speed medium and a penetrable bottom. Range invariant mode model time series are compared to actual experimental data [C. Tindle et al., J. Acoust. Soc. Am. 81, 288--293 (1987)] and to time series that were calculated using a ray model that includes beam displacement [E. Westwood and C. Tindle, J. Acoust. Soc. Am. 81, 1752--1761 (1987)]. The time series from both the mode and ray models agree with each other and with the measured data. In addition, time series from an adiabatic mode model for a shallow-water wedge environment are compared to the experimental results obtained by C. Tindle et al. [Work supported by IR&D Fund at Applied Research Laboratories, The University of Texas at Austin.]