Analysis and modeling of broadband airgun data influenced by nonlinear internal waves
Frank, Scott D.
Lynch, James F.
Siegmann, William L.
MetadataShow full item record
KeywordAcoustic resonance; Nonlinear acoustics; Underwater acoustic propagation; Parabolic equations; Acoustic intensity
To investigate acoustic effects of nonlinear internal waves, the two southwest tracks of the SWARM 95 experiment are considered. An airgun source produced broadband acoustic signals while a packet of large nonlinear internal waves passed between the source and two vertical linear arrays. The broadband data and its frequency range (10–180 Hz) distinguish this study from previous work. Models are developed for the internal wave environment, the geoacoustic parameters, and the airgun source signature. Parabolic equation simulations demonstrate that observed variations in intensity and wavelet time–frequency plots can be attributed to nonlinear internal waves. Empirical tests are provided of the internal wave-acoustic resonance condition that is the apparent theoretical mechanism responsible for the variations. Peaks of the effective internal wave spectrum are shown to coincide with differences in dominant acoustic wavenumbers comprising the airgun signal. The robustness of these relationships is investigated by simulations for a variety of geoacoustic and nonlinear internal wave model parameters.
Author Posting. © Acoustical Society of America, 2004. 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 116 (2004): 3404-3422, doi:10.1121/1.1819499.
Suggested CitationArticle: Frank, Scott D., Badiey, Mohsen, Lynch, James F., Siegmann, William L., "Analysis and modeling of broadband airgun data influenced by nonlinear internal waves", Journal of the Acoustical Society of America 116 (2004): 3404-3422, DOI:10.1121/1.1819499, https://hdl.handle.net/1912/2481
Showing items related by title, author, creator and subject.
Badiey, Mohsen; Katsnelson, Boris G.; Lin, Ying-Tsong; Lynch, James F. (Acoustical Society of America, 2011-03-28)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 ...
Acoustic ducting, reflection, refraction, and dispersion by curved nonlinear internal waves in shallow water Lynch, James F.; Lin, Ying-Tsong; Duda, Timothy F.; Newhall, Arthur E. (IEEE Oceanic Engineering Society, 2010-02-08)Nonlinear internal waves in shallow water have been shown to be effective ducts of acoustic energy, through theory, numerical modeling, and experiment. To date, most work on such ducting has concentrated on rectilinear ...
Experimental evidence of three-dimensional acoustic propagation caused by nonlinear internal waves Frank, Scott D.; Badiey, Mohsen; Lynch, James F.; Siegmann, William L. (Acoustical Society of America, 2005-08)The 1995 SWARM experiment collected high quality environmental and acoustic data. One goal was to investigate nonlinear internal wave effects on acoustic signals. This study continues an investigation of broadband airgun ...