Abstract
Abstract : North Pacific Acoustic Laboratory (NPAL) is the name for a set of experiments on long-range acoustic propagation through the ocean. For a sound to travel far in the ocean, its frequency must be low; sound at 70HZ was frequently used in NPAL experiments. It is common for the propagation of sound to be described in terms of ray tracing, a theory that assumes the frequency is high. An obvious question is whether NPAL frequencies used in experiments are high enough to allow use of my tracing. The PI wrote a my trace program and an internal wave simulation program, more realistic than other programs in existence. The research showed that rays could not be correct for the effects of internal waves, but did not find out in what way they were wrong. This research has been continued on ONR grant N00014-05-1-0282.
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