2025_programme: Impact of viscous grain shearing parameters on model manifolds

• Day: June 19, Thursday
    Location / Time: C. THALIA at 14:30-14:50
• Last minutes changes: -
• Session: 15. Seabed Acoustics
  Organiser(s): Megan Ballard, Kevin Lee, Nick Chotiros
  Chairperson(s): Traci Neilsen
• Lecture: Impact of viscous grain shearing parameters on model manifolds [Invited]
  Paper ID: 2224
  Author(s): Tracianne Neilsen, Michelle Wang, Aviana Smith, Jay Spendlove, Mark Transtrum
  Presenter: Traci Neilsen
  Abstract: When inferring seabed properties, the selection of an appropriate seabed parametrization is a challenge compounded by potential bias of establishing bounds on the parameter search space. One approach to addressing these challenges is to obtain a reduced-order model using techniques of Information geometry. This paper provides an information geometric analysis of a shallow-water waveguide, where the properties of a lower half-space are described by the viscous grain-shearing (VGS) model.  The relationship between the VGS parameters and transmission loss at different depths, ranges, and frequencies are examined via model manifolds.  The model manifolds are also evaluated for depth-dependent mode functions and modal wavenumbers over different frequency bands. The limits and boundaries of the model manifolds are explored as the VGS parameters associated with the grains approach both low and high extremes.  These limits and the structure of the model manifolds reveal the relative stiffness and sloppiness of model parameters and provide indications of parameter hierarchies and correlations. This work can inform the selection of reduced-order models tailored to specific applications. [Work supported by the Office of Naval Research. Grant N00014-24-12566.]
• Corresponding author: Prof Traci Neilsen
  Affiliation: Brigham Young University
  Country: United States