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    Low frequency acoustic propagation over calcarenite seabeds with thin, hard caps.

    191024_73002_duncan_low_frequency_acoustic_2012pdf.pdf (643.5Kb)
    Access Status
    Open access
    Authors
    Duncan, Alexander
    Gavrilov, Alexander
    Date
    2012
    Type
    Conference Paper
    
    Metadata
    Show full item record
    Citation
    Duncan, Alec J. and Gavrilov, Alexander. 2012. Low frequency acoustic propagation over calcarenite seabeds with thin, hard caps, in McMinn, Terrance (ed), Acoustics 2012 Fremantle: Acoustics, Development and the Environment, The 2012 Conference of the Australian Acoustical Society, Nov 21-23 2012. Fremantle, Western Australia: Australian Acoustical Society
    Source Title
    Proceedings of the Acoustical Society of Australia
    Source Conference
    Acoustics 2012 Fremantle: Acoustics, Development and the Environment, the 2012 Conference of the Australian Acoustical Society
    Additional URLs
    http://www.acoustics.asn.au/conference_proceedings/AAS2012/papers/p88.pdf
    ISBN
    9780646590394
    URI
    http://hdl.handle.net/20.500.11937/29453
    Collection
    • Curtin Research Publications
    Abstract

    Much of Australia's continental shelf consists of a relatively soft limestone called calcarenite, which is variable in geoacoustic properties and covered by a thin veneer of unconsolidated sediment vanishing in some areas. Low frequency underwater acoustic propagation in such environments is strongly influenced by the geoacoustic properties of the calcarenite, which typically has a shear speed slightly lower than the sound speed in water. This often results in strong frequency dependence of the acoustic transmission loss with some frequency bands having a much lower transmission loss than the nearby frequencies. In some cases the upper part of the calcarenite consists of a thin (~1m) layer of hard, well-cemented calcarenite overlaying softer, semi-cemented layers. This paper considers the effect that this hard cap has on the acoustic reflectivity of the seabed and on the resulting acoustic propagation at frequencies sufficiently low that the upper, well-cemented layer is thinner than its shear and compressional wavelengths.

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      The sediment deficient western and southern Australian coastal seafloors consist of semi-compact layered calcarenite. Although there is a large body of work investigating and modelling the characteristics of underwater ...
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