Acoustic multipath arrivals in the horizontal plane due to approaching nonlinear internal waves
Author(s) -
Mohsen Badiey,
Boris Katsnelson,
Ying-Tsong Lin,
James F. Lynch
Publication year - 2011
Publication title -
the journal of the acoustical society of america
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.619
H-Index - 187
eISSN - 1520-8524
pISSN - 0001-4966
DOI - 10.1121/1.3553374
Subject(s) - multipath interference , acoustics , multipath propagation , interference (communication) , internal wave , acoustic wave , physics , horizontal plane , wave packet , optics , nonlinear system , plane wave , acoustic wave equation , geology , computer science , telecommunications , geodesy , channel (broadcasting) , quantum mechanics
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.
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