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Observationally constrained modeling of sound in curved ocean internal waves: Examination of deep ducting and surface ducting at short range

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dc.contributor.author Duda, Timothy F.
dc.contributor.author Lin, Ying-Tsong
dc.contributor.author Reeder, D. Benjamin
dc.date.accessioned 2011-09-12T18:26:59Z
dc.date.available 2011-09-12T18:26:59Z
dc.date.issued 2011-09
dc.identifier.citation Journal of the Acoustical Society of America 130 (2011): 1173-1187 en_US
dc.identifier.uri http://hdl.handle.net/1912/4807
dc.description 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 130 (2011): 1173-1187, doi:10.1121/1.3605565. en_US
dc.description.abstract A study of 400 Hz sound focusing and ducting effects in a packet of curved nonlinear internal waves in shallow water is presented. Sound propagation roughly along the crests of the waves is simulated with a three-dimensional parabolic equation computational code, and the results are compared to measured propagation along fixed 3 and 6 km source/receiver paths. The measurements were made on the shelf of the South China Sea northeast of Tung-Sha Island. Construction of the time-varying three-dimensional sound-speed fields used in the modeling simulations was guided by environmental data collected concurrently with the acoustic data. Computed three-dimensional propagation results compare well with field observations. The simulations allow identification of time-dependent sound forward scattering and ducting processes within the curved internal gravity waves. Strong acoustic intensity enhancement was observed during passage of high-amplitude nonlinear waves over the source/receiver paths, and is replicated in the model. The waves were typical of the region (35 m vertical displacement). Two types of ducting are found in the model, which occur asynchronously. One type is three-dimensional modal trapping in deep ducts within the wave crests (shallow thermocline zones). The second type is surface ducting within the wave troughs (deep thermocline zones). en_US
dc.description.sponsorship Grants from the Office of Naval Research funded this work. Use of the vessels Ocean Researcher I and Ocean Researcher II in this experiment was funded by the Taiwan National Science Council. en_US
dc.format.mimetype application/pdf
dc.language.iso en_US en_US
dc.publisher Acoustical Society of America en_US
dc.relation.uri http://dx.doi.org/10.1121/1.3605565
dc.subject Acoustic field en_US
dc.subject Acoustic focusing en_US
dc.subject Acoustic intensity en_US
dc.subject Acoustic wave scattering en_US
dc.subject Acoustic wave velocity en_US
dc.subject Ocean waves en_US
dc.subject Oceanographic regions en_US
dc.subject Underwater acoustic propagation en_US
dc.title Observationally constrained modeling of sound in curved ocean internal waves: Examination of deep ducting and surface ducting at short range en_US
dc.type Article en_US
dc.identifier.doi 10.1121/1.3605565


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