Curtin University Homepage
  • Library
  • Help
    • Admin

    espace - Curtin’s institutional repository

    JavaScript is disabled for your browser. Some features of this site may not work without it.
    View Item 
    • espace Home
    • espace
    • Curtin Research Publications
    • View Item
    • espace Home
    • espace
    • Curtin Research Publications
    • View Item

    Recent developments in modelling acoustic reflection loss at the rough ocean surface

    183022.pdf (634.4Kb)
    Access Status
    Open access
    Authors
    Jones, A.
    Duncan, Alexander
    Bartel, D.
    Zinoviev, A.
    Maggi, Amos
    Date
    2011
    Type
    Conference Paper
    
    Metadata
    Show full item record
    Citation
    Jones, Adrian D. and Duncan, Alec J. and Bartel, David W. and Zinoviev, Alex and Maggi, Amos. 2011. Recent developments in modelling acoustic reflection loss at the rough ocean surface, in D.J. Mee and I.D.M. Hillock (ed), Proceedings of Acoustics 2011: Breaking New Ground, Nov 2-4 2011, pp. 1-8. Gold Coast, Qld.: Australian Acoustical Society.
    Source Title
    Acoustics 2011: Breaking New GroundProceedings of the Annual Conference of the Australian Acousticial Society
    Source Conference
    Acoustics 2011: Breaking New Ground
    ISBN
    978-0-9757855-8-4
    School
    Centre for Marine Science & Technology (COE)
    Remarks

    Copyright © 2011 The Australian Acoustical Society

    URI
    http://hdl.handle.net/20.500.11937/28976
    Collection
    • Curtin Research Publications
    Abstract

    The transmission of sonar signals in a surface ducted environment, or in a shallow ocean, is affected by reflection losses at the ocean surface, when wind action or swell causes the surface to be roughened. Under these circumstances, the amplitude of the specular reflection of sound at the ocean surface is reduced by a number of complex phenomena, including: the sea surface shape; acoustic shadowing of parts of the surface to sound incident at small angles; diffraction of sound into the shadow zones; and bubble formation from white-caps. Recent work has shown that the inclusion of these effects within a ray model of transmission is a formidable prospect, as ray theory cannot describe all the phenomena explicitly, and the inclusion of acoustic wave effects in combination with a ray model is required. This paper addresses several of the complexities, in the search for a comprehensive solution to this modelling issue. In particular, the appropriateness of the Small-Slope Approximation roughness model used by Williams et al, (JASA, 116, Oct. 2004) is investigated, using a Parabolic Equation (PE) model, Also, the refraction near the ocean surface caused by wind-induced bubbles (e.g. Ainslie, JASA, 118, Dec. 2005) is investigated using the PE model. Lastly, the surface loss values obtained for received coherent sound pressure are compared with those relevant to received root-mean-square sound pressure. The paper speculates on the prospects for the future development of a surface loss model that includes all relevant effects.

    Related items

    Showing items related by title, author, creator and subject.

    • Propagation of underwater noise from an offshore seismic survey in Australia to Antarctica: Measurements and modelling
      Gavrilov, Alexander (2017)
      An offshore seismic survey was conducted over the western edge of the continental shelf in Bass Strait in 2006. Underwater noise from this survey was recorded on an autonomous sound recorder deployed in the Southern Ocean ...
    • Propagation of Underwater Noise from an Offshore Seismic Survey in Australia to Antarctica: Measurements and Modelling
      Gavrilov, Alexander (2018)
      © 2018, Australian Acoustical Society. An offshore seismic survey was conducted over the western edge of the continental shelf in Bass Strait in 2006. Underwater noise from this survey was recorded on an autonomous sound ...
    • Modelling acoustic propagation beneath Antarctic sea ice using measured environmental parameters
      Alexander, P.; Duncan, Alec; Bose, N.; Williams, G. (2016)
      Autonomous underwater vehicles are improving and expanding in situ observations of sea ice for the validation of satellite remote sensing and climate models. Missions under sea ice, particularly over large distances (up ...
    Advanced search

    Browse

    Communities & CollectionsIssue DateAuthorTitleSubjectDocument TypeThis CollectionIssue DateAuthorTitleSubjectDocument Type

    My Account

    Admin

    Statistics

    Most Popular ItemsStatistics by CountryMost Popular Authors

    Follow Curtin

    • 
    • 
    • 
    • 
    • 

    CRICOS Provider Code: 00301JABN: 99 143 842 569TEQSA: PRV12158

    Copyright | Disclaimer | Privacy statement | Accessibility

    Curtin would like to pay respect to the Aboriginal and Torres Strait Islander members of our community by acknowledging the traditional owners of the land on which the Perth campus is located, the Whadjuk people of the Nyungar Nation; and on our Kalgoorlie campus, the Wongutha people of the North-Eastern Goldfields.