Comparison of hybrid three-dimensional modeling with measurements on the continental shelf

The Journal of the Acoustical Society of America
Kevin D HeaneyJames J Murray

Abstract

During the CALOPS 2007 experiment, off the coast of Fort Lauderdale, Florida, three-dimensional (3D) multipath was observed using a bottom mounted horizontal line array during source tows along the 200 m isobath [Kevin D. Heaney and James J. Murray, J. Acoust. Soc. Am. 125(4), 1394-1402 (2008)]. In this paper a hybrid modeling approach is presented to model the 3D sound on the Florida shelf, nearly shaped like the canonical wedge. The hybrid approach combines vertical acoustic normal modes with the parabolic equation solution (in range/cross-range). The approach is shown to satisfy the 3D Cartesian-coordinate wave equation in the limit of adiabatic mode propagation. In the adiabatic mode parabolic equation (AMPE) approach modal phase speeds vs position are used as the input to the parabolic equation computation with dimensions of easting (km) and northing (km). Vertical adiabatic modes and horizontal rays are also computed to illustrate the 3D multipath arrival. The AMPE field is computed for all the modes for each element of the horizontal array. Beamforming vs source range is then conducted and excellent agreement with data is achieved.

References

Feb 1, 2003·The Journal of the Acoustical Society of America·D P KnoblesP E Eisman

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Citations

Oct 15, 2013·The Journal of the Acoustical Society of America·Kevin D HeaneyMirjam Snellen
Mar 4, 2017·The Journal of the Acoustical Society of America·Kevin D HeaneyRichard L Campbell
Dec 5, 2016·The Journal of the Acoustical Society of America·Sean M ReillyDavid Thibaudeau

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