Enhanced acoustic mode coupling resulting from an internal solitary wave approaching the shelfbreak in the South China Sea

dc.contributor.author Chiu, Linus Y. S.
dc.contributor.author Reeder, D. Benjamin
dc.contributor.author Chang, Yuan-Ying
dc.contributor.author Chen, Chi-Fang
dc.contributor.author Chiu, Ching-Sang
dc.contributor.author Lynch, James F.
dc.date.accessioned 2013-06-26T18:47:22Z
dc.date.available 2013-06-26T18:47:22Z
dc.date.issued 2013-03
dc.description Author Posting. © Acoustical Society of America, 2013. 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 133 (2013): 1306-1319, doi:10.1121/1.4789358. en_US
dc.description.abstract Internal waves and bathymetric variation create time- and space-dependent alterations in the ocean acoustic waveguide, and cause subsequent coupling of acoustic energy between propagating normal modes. In this paper, the criterion for adiabatic invariance is extended to the case of an internal solitary wave (ISW) encountering a sloping bathymetry (i.e., continental shelfbreak). Predictions based on the extended criterion for adiabatic invariance are compared to experimental observations from the Asian Seas International Acoustics Experiment. Using a mode 1 starter field, results demonstrate time-dependent coupling of mode 1 energy to higher adjacent modes, followed by abrupt coupling of mode 5–7 energy to nonadjacent modes 8–20, produces enhanced mode coupling and higher received levels downrange of the oceanographic and bathymetric features. Numerical simulations demonstrate that increasing ISW amplitude and seafloor slope enhance the coupling of energy to adjacent and nonadjacent modes. This enhanced coupling is the direct result of the simultaneous influence of the ISW and its proximity to the shelfbreak, and, compared to the individual effect of the ISW or shelfbreak, has the capacity to scatter 2–4 times the amount of acoustic energy from below the thermocline into the upper water column beyond the shelfbreak in realistic environments. en_US
dc.description.sponsorship The ASIAEX and NLIWI experiments were supported jointly by the National Science Council of Taiwan and the U.S. Office of Naval Research. en_US
dc.format.mimetype application/pdf
dc.identifier.citation Journal of the Acoustical Society of America 133 (2013): 1306-1319 en_US
dc.identifier.doi 10.1121/1.4789358
dc.identifier.uri https://hdl.handle.net/1912/6019
dc.language.iso en_US en_US
dc.publisher Acoustical Society of America en_US
dc.relation.uri https://doi.org/10.1121/1.4789358
dc.subject Acoustic intensity en_US
dc.subject Acoustic wave scattering en_US
dc.subject Bathymetry en_US
dc.subject Ocean waves en_US
dc.subject Solitons en_US
dc.subject Underwater acoustic propagation en_US
dc.title Enhanced acoustic mode coupling resulting from an internal solitary wave approaching the shelfbreak in the South China Sea en_US
dc.type Article en_US
dspace.entity.type Publication
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