Horizontal Lloyd mirror patterns from straight and curved nonlinear internal waves

The Journal of the Acoustical Society of America
Kara G McMahonTimothy F Duda

Abstract

Experimental observations and theoretical studies show that nonlinear internal waves occur widely in shallow water and cause acoustic propagation effects including ducting and mode coupling. Horizontal ducting results when acoustic modes travel between internal wave fronts that form waveguide boundaries. For small grazing angles between a mode trajectory and a front, an interference pattern may arise that is a horizontal Lloyd mirror pattern. An analytic description for this feature is provided along with comparisons between results from the formulated model predicting a horizontal Lloyd mirror pattern and an adiabatic mode parabolic equation. Different waveguide models are considered, including boxcar and jump sound speed profiles where change in sound speed is assumed 12 m/s. Modifications to the model are made to include multiple and moving fronts. The focus of this analysis is on different front locations relative to the source as well as on the number of fronts and their curvatures and speeds. Curvature influences mode incidence angles and thereby changes the interference patterns. For sources oriented so that the front appears concave, the areas with interference patterns shrink as curvature increases, while convexly orie...Continue Reading

References

Feb 28, 2002·The Journal of the Acoustical Society of America·Roger Oba, Steven Finette
Mar 12, 2005·The Journal of the Acoustical Society of America·Mohsen BadieyWilliam L Siegmann
Mar 14, 2007·The Journal of the Acoustical Society of America·John R ApelJames F Lynch
Aug 4, 2007·The Journal of the Acoustical Society of America·Mohsen BadieySerguey Pereselkov
Dec 3, 2008·The Journal of the Acoustical Society of America·James Lynch, Dajun Tang
Dec 3, 2008·The Journal of the Acoustical Society of America·Daniel RouseffJames N Moum
Dec 3, 2008·The Journal of the Acoustical Society of America·Boris KatsnelsonJames F Lynch
Apr 12, 2011·The Journal of the Acoustical Society of America·Mohsen BadieyJames F Lynch

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Citations

Jul 19, 2013·The Journal of the Acoustical Society of America·Mohsen BadieyAijun Song
May 13, 2014·The Journal of the Acoustical Society of America·Alexey A ShmelevHenrik Schmidt
Jan 10, 2013·The Journal of the Acoustical Society of America·Ying-Tsong LinWilliam L Siegmann
Oct 9, 2019·The Journal of the Acoustical Society of America·Georges A DossotGopu R Potty
Oct 9, 2019·The Journal of the Acoustical Society of America·Matthew A MiloneWilliam L Siegmann
Oct 9, 2019·The Journal of the Acoustical Society of America·Boris G Katsnelson, Pavel S Petrov

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