Bowlin James B.

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Bowlin
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James B.
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  • Article
    Ray-acoustic caustic formation and timing effects from ocean sound-speed relative curvature
    (Acoustical Society of America, 1994-08) Duda, Timothy F. ; Bowlin, James B.
    Using deterministic ray-acoustic modeling of 1000-km propagation in the North Pacific, a depth-dependent parameter of ocean sound channels has been found to strongly influence geometrical ray propagation. This parameter is the sound speed times the second vertical derivative of sound speed divided by the square of the first derivative. Ray and wavefront timing and intensity can be influenced within realistic ocean sound channels by unpredictable wavefront triplications and caustics. These triplications are associated with large values of the parameter at ray turning points. The parameter, a relative curvature, behaves as a random variable because of ocean finestructure, causing the unpredictability. The relative curvature has a higher mean value near the sound-speed minimum for both an internal-wave model and actual data, so that this mechanism is a plausible explanation of poor multipath resolution and identifiability late in North Pacific pulse trains.
  • Technical Report
    Ocean acoustical ray-tracing : Software Ray
    (Woods Hole Oceanographic Institution, 1992-10) Bowlin, James B. ; Spiesberger, John L. ; Duda, Timothy F. ; Freitag, Lee E.
    A new computer program for accurate calculation of acoustic ray paths through a range-varing ocean sound channel has been written. It is based on creating a model of the speed of sound in the ocean, consistent with input data, that produces the smoothest possible wavefronts. This scheme eliminates "false caustics" from the wavefront. It may be useful in calculating an approximate solution to the full wave equation at megameter ranges.