2025_programme: Dispersion theory for a shallow sea model with the two-layer bottom

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  • Day: June 19, Thursday
      Location / Time: C. THALIA at 12:40-13:00
  • Last minutes changes: -
  • Session: 15. Seabed Acoustics
    Organiser(s): Megan Ballard, Kevin Lee, Nick Chotiros
    Chairperson(s): Nicholas Chotiros
  • Lecture: Dispersion theory for a shallow sea model with the two-layer bottom
    Paper ID: 2363
    Author(s): Alena Zakharenko, Julien Bonnel, Stan Dosso
    Presenter: Pavel Petrov
    Abstract: In the study the dispersion relations in a shallow-water waveguide with a two-layer bottom are considered. The layers of the bottom are characterized by n^2-linear dependence of sound velocity on depth (in other words, the bottom consists of two layers of Airy media). Ordinary differential equations describing the dependence of horizontal wavenumbers of acoustic modes on the geoacoustic parameters of the bottom layers, as well as on water depth and sound frequency, are derived. Such equations can be used for solving geoacoustic inversion problems by performing exhaustive search in the parameters space. Their solution requires much less computational effort than the computation of modes for each set of the geoacoustic parameters. Several numerical examples of geoacoustic inversion problems are presented, both for synthetic and real data dispersion data.
  • Corresponding author: Prof Pavel Petrov
    Affiliation: Instituto de Matemática Pura e Aplicada/University of Wuppertal
    Country: Brazil

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