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    The effect of internal waves on underwater sound propagation

    Access Status
    Fulltext not available
    Authors
    Parnum, Iain
    MacLeod, R.
    Duncan, Alec
    Gavrilov, Alexander
    Date
    2017
    Type
    Conference Paper
    
    Metadata
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    Citation
    Parnum, I. and MacLeod, R. and Duncan, A. and Gavrilov, A. 2017. The effect of internal waves on underwater sound propagation.
    Source Title
    Proceedings of ACOUSTICS 2017 Perth: Sound, Science and Society - 2017 Annual Conference of the Australian Acoustical Society, AAS 2017
    ISBN
    9780909882075
    School
    Centre for Marine Science and Technology
    URI
    http://hdl.handle.net/20.500.11937/65486
    Collection
    • Curtin Research Publications
    Abstract

    Knowledge of the undersea environment is critical in estimating ship and submarine performance, estimating ownship susceptibility, and for tactical planning. A major factor determining the detection range of an active sonar system is the sound velocity profile (SVP). Traditionally, the SVP is measured by deploying an XBT (expendable bathythermograph) and converting the temperature profile to an SVP at the location of the ship. Sonar performance is then predicted based on this SVP. However, the ocean is a dynamic environment, and sound propagation conditions can change with both position and time. This study investigated the effect of the variation in the sound velocity profile (SVP) in a dynamic oceanographic region: the Kimberley shelf, where phenomena such as internal waves are present. Temperature and salinity data collected in the Kimberley region, as part of the Integrated Marine Observing System's National Mooring Network, were used to produce SVPs at a sampling interval of 1 minute. These SVPs were then used in a range dependent sound propagation model (RAM Geo). This paper presents the results of this modelling.

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