1pAO12. Modeling issues in the simulation of long-range ocean acoustic pulse transmissions.

Session: Monday Afternoon, December 2

Time: 4:55

Author: B. Edward McDonald
Location: Naval Res. Lab., Washington, DC 20375
Author: W. A. Kuperman
Location: Scripps Inst. of Oceanogr., La Jolla, CA 92093
Author: Kevin D. Heaney
Location: Scripps Inst. of Oceanogr., La Jolla, CA 92093


Pulse propagation from a wideband source in the ocean sound channel is being modeled theoretically and numerically in the time domain for comparison with ATOC transmissions on a 3-Mm path between California and Hawaii. The physics of pulse dispersion in a waveguide is addressed using stationary phase approximations for integrals over frequency. For a parabolic sound slowness profile the basic theory admits a closed analytic solution for an impulsive source using the WKB approximation. Inclusion of realistic SSPs with time- and range-dependent fluctuations (primarily internal waves) is accomplished by a combination of parabolic equation modeling and modal analysis. Attempts to include realistic fluctuations in the stationary phase approximation are discussed. [Work supported by NRL and ONR and by the Strategic Environmental Research and Development Program through ARPA.]

ASA 132nd meeting - Hawaii, December 1996