2023_programme: Combined seabed and source characterization from feature-based inversion with merchant shipping noise

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  • Session: 06. Marine sediment acoustics
    Organiser(s): Megan Ballard, Kevin Lee and Nick Chotiros
  • Lecture: Combined seabed and source characterization from feature-based inversion with merchant shipping noise [invited]
    Paper ID: 1906
    Author(s): Knobles David, Neilsen Tracianne, Hodgkiss William, Tollefsen Dag
    Presenter: Knobles David
    Abstract: A feature-based inversion method is tested on recordings of surface ship noise collected on a 16-element vertical line array deployed on the New England continental shelf during the Seabed Characterization Experiment 2017. The received levels at the closest position of approach (CPA) time as a function of frequency for each channel on the array are identified as features. The received levels exhibit a peak and null structure due to the coherent superposition of surface and bottom reflected components of the acoustic field. An error function is constructed that is an average over frequency and channel number of the square of the difference of the inferred measured transmission loss and the modeled transmission loss for point in a 6-D hypothesis space that includes both geophysical parameters of the seabed and source parameters. For each channel a frequency dependent source level is inferred from the measured received level and is then compared to the Wales-Heitmeyer empirical ensemble source level (2002). Work supported by Office of Naval Research.
      Download the full paper
  • Corresponding author: Dr David Knobles
    Affiliation: Knobles Scientific and Analysis
    Country: United States
    e-mail:

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