2019_programme: EFFECT OF A SOFT SEDIMENT LAYER ON ACOUSTIC NORMAL MODE PROPAGATION IN THE NEW ENGLAND MUD PATCH

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  • Session: 12. Marine sediment acoustics
    Organiser(s): Ballard Megan , Lee Kevin
  • Lecture: EFFECT OF A SOFT SEDIMENT LAYER ON ACOUSTIC NORMAL MODE PROPAGATION IN THE NEW ENGLAND MUD PATCH [invited]
    Paper ID: 956
    Author(s): Potty Gopu R, Miller James H
    Presenter: Potty Gopu
    Presentation type: oral
    Abstract: Previous studies have shown that the travel times of acoustic normal modes corresponding to the Airy Phase regions were found to be extremely sensitive to shear. Effect of sea bottom with different shear speeds on the modal dispersion will be analyzed. Simple half-space bottom models will be used to predict modal dispersion and compare it with experimental data. Modal dispersion characteristics of broadband data collected during experiments conducted in Middle Atlantic Bight and New England Mud patch will be analyzed and estimates of the bottom shear speeds will be made. The estimated shear speeds will also compared with shear speeds calculated from core data. In this study the bottom model will then be revised to include a soft sediment layer over the elastic basement to reflect the bottom conditions corresponding to New England Mud Patch. The modal dispersion will be calculated using this bottom model corresponding to the New England Mud patch environment using propagation model ORCA. The effect of the addition of soft mud layer on dispersion of lower order modes will be investigated and presented. The sensitivity of modal propagation to the soft mud sediment layer will be explored. [Work supported by the Office of Naval Research].
  • Corresponding author: Prof Potty Gopu R
    Affiliation: University of Rhode Island
    Country: United States
    e-mail:

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