2025_programme: Complex seabed scattering from broadband sources in the New England Mud Patch

• Day: June 19, Thursday
    Location / Time: C. THALIA at 15:10-15:30
• Last minutes changes: Cancelled
• Session: 15. Seabed Acoustics
  Organiser(s): Megan Ballard, Kevin Lee, Nick Chotiros
  Chairperson(s): Traci Neilsen
• Lecture: Complex seabed scattering from broadband sources in the New England Mud Patch [Invited]
  Paper ID: 2361
  Author(s): Jade Lopez Case, James Miller, Gopu Potty
  Presenter: Jade Lopez Case
  Abstract: The New England Mud Patch (NEMP) has been a region of interest in underwater acoustics for the past decade. Numerous geo-acoustic inversion methods have been used to estimate the compressional and shear wave speeds, and densities of four distinguishable sediment layers. While exact values vary, it is known that the upper-most layer is a relatively thin, fluid-like layer (layer 1) of mud. Below that lies more rigid mud (layer 2) that has varying physical properties with depth, followed by a sand layer (layer 3) of approximately 10 m. Below these sediment layers an elastic half-space layer is assumed for modeling purposes. The Seabed Characterization Experiment (SBCEX22) utilized Ocean Bottom Recorders (OBX’s) to provide acoustic and seismic measurements taken at the water-sediment interface. The resulting acoustic pressure and particle velocity measurements indicate the presence of frequency dependent reverberation, likely from random roughness at the mud-sand interface between layer 2 and layer 3. Analysis of the shear potential in the elastic layers of the seabed suggests that the frequency dependency seen in these data can be attributed to bottom loss from complex shear effects. Data from the NEMP and modeling results from a wavenumber integration model will be shown and compared.
• Corresponding author: Ms Jade Lopez Case
  Affiliation: University of Rhode Island
  Country: United States