Acoustic multipath arrivals in the horizontal plane due to approaching nonlinear internal waves
Katsnelson, Boris G.
Lynch, James F.
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SubjectAcoustic signal processing; Acoustic wave interference; Acoustic wave reflection; Acoustic wave refraction; Acoustic wave transmission; Nonlinear acoustics; Underwater sound
Simultaneous measurements of acoustic wave transmissions and a nonlinear internal wave packet approaching an along-shelf acoustic path during the Shallow Water 2006 experiment are reported. The incoming internal wave packet acts as a moving frontal layer reflecting (or refracting) sound in the horizontal plane. Received acoustic signals are filtered into acoustic normal mode arrivals. It is shown that a horizontal multipath interference is produced. This has previously been called a horizontal Lloyd’s mirror. The interference between the direct path and the refracted path depends on the mode number and frequency of the acoustic signal. A mechanism for the multipath interference is shown. Preliminary modeling results of this dynamic interaction using vertical modes and horizontal parabolic equation models are in good agreement with the observed data.
Author Posting. © Acoustical Society of America, 2011. This article is posted here by permission of Acoustical Society of America for personal use, not for redistribution. The definitive version was published in Journal of the Acoustical Society of America 129 (2011): EL141-EL147, doi:10.1121/1.3553374.
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