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dc.contributor.authorZinoviev, A.
dc.contributor.authorBartel, D.
dc.contributor.authorJones, Adrian
dc.contributor.editorna
dc.date.accessioned2018-04-30T02:40:08Z
dc.date.available2018-04-30T02:40:08Z
dc.date.created2018-04-16T07:41:37Z
dc.date.issued2012
dc.identifier.citationZinoviev, A. and Bartel, D. and Jones, A. 2012. An investigation of plane wave propagation through a layer with high sound speed gradient, in na (ed), Acoustics 2012, Nov 21 2012, pp. 93-100. Fremantle, Australia: na.
dc.identifier.urihttp://hdl.handle.net/20.500.11937/66326
dc.description.abstract

In modelling the reflection of sound from an ocean surface, it is necessary to include the refractive effects of near-surface bubbles generated by wind action for certain frequencies. The vertical sound speed gradient in the near-surface region is, however, so extreme that ray acoustics cannot be applied, and thus a wave approach is necessary. This paper describes the nature, and application, of a suitable wave-based description of the refraction of the intensity vector in this region of very high sound speed gradient. It is shown that the sound speed profile in the high-gradient layer can be well approximated by the sound speed profile in the "transitional" layer described by Brekhovskikh (Waves in Layered Media, Academic Press 1960). This exact solution of the wave equation is used to calculate the depth dependence of the acoustic pressure amplitude of the incident plane wave. The fluid particle velocity vector at the surface is also calculated and, together with the pressure amplitude, is used to obtain the intensity vector. Results show that, close to the resonance frequencies, the grazing angle at the surface is significantly larger than that predicted by the laws of geometrical acoustics. It is also shown that these resonance-like phenomena are characteristic not only of sound speed gradients typical of near-surface bubbles, but also of the less-severe gradient typical of conventional isothermal conditions.

dc.publisherna
dc.titleAn investigation of plane wave propagation through a layer with high sound speed gradient
dc.typeConference Paper
dcterms.source.startPage93
dcterms.source.endPage100
dcterms.source.titleAustralian Acoustical Society Conference 2012, Acoustics 2012: Acoustics, Development, and the Environment
dcterms.source.seriesAustralian Acoustical Society Conference 2012, Acoustics 2012: Acoustics, Development, and the Environment
dcterms.source.isbn9781622769704
dcterms.source.conferenceAcoustics 2012
dcterms.source.conference-start-dateNov 21 2012
dcterms.source.conferencelocationFremantle, Australia
dcterms.source.placeAustralia
curtin.accessStatusFulltext not available


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