Verification of the Adiabatic Invariant Approximation for Computing Effective Horizontal Sound Speeds in a Range-Dependent Environment.
Interim rept. Apr-Sep 80,
NAVAL OCEAN SYSTEMS CENTER SAN DIEGO CA
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Use of the Adiabatic Invariant Approximation AIA for determining horizontal sound speeds in a range-dependent environment has been proposed recently R. C. Shockley, J. Acoust. SOC. AM. 64, 1171 1978. Because the method provides a great savings in computer time over conventional ray-tracing techniques, it was applied to two very-long-range paths, from Perth, Australia, to Bermuda and to Fernando de Noronha 19763.0 and 14549.3 km, respectively, where measured travel times are available. Results show that the AIA method predicts effective horizontal sound speeds of 1482.3ms and 1480.4ms, respectively, for the two propagation paths. These results compare favorably with the measured values of 1484.7 or - 3.7 ms and 1480.1 or - 0.9 ms. Author
- Physical and Dynamic Oceanography