Show simple item record

dc.contributor.authorDuda, Timothy F.
dc.contributor.authorLin, Ying-Tsong
dc.contributor.authorReeder, D. Benjamin
dc.date.accessioned2011-09-12T18:26:59Z
dc.date.available2011-09-12T18:26:59Z
dc.date.issued2011-09
dc.identifier.citationJournal of the Acoustical Society of America 130 (2011): 1173-1187en_US
dc.identifier.urihttp://hdl.handle.net/1912/4807
dc.descriptionAuthor 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.abstractA 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.sponsorshipGrants 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.mimetypeapplication/pdf
dc.language.isoen_USen_US
dc.publisherAcoustical Society of Americaen_US
dc.relation.urihttp://dx.doi.org/10.1121/1.3605565
dc.subjectAcoustic fielden_US
dc.subjectAcoustic focusingen_US
dc.subjectAcoustic intensityen_US
dc.subjectAcoustic wave scatteringen_US
dc.subjectAcoustic wave velocityen_US
dc.subjectOcean wavesen_US
dc.subjectOceanographic regionsen_US
dc.subjectUnderwater acoustic propagationen_US
dc.titleObservationally constrained modeling of sound in curved ocean internal waves: Examination of deep ducting and surface ducting at short rangeen_US
dc.typeArticleen_US
dc.identifier.doi10.1121/1.3605565


Files in this item

Thumbnail

This item appears in the following Collection(s)

Show simple item record