2025_programme: Geoacoustic inversion with optimal transport

• Day: June 16, Monday
    Location / Time: B. ERATO at 11:00-11:20
• Last minutes changes: -
• Session: 07. Inverse Problems in Acoustical Oceanography
  Organiser(s): Julien Bonnel, Stan Dosso
  Chairperson(s): Julien Bonnel, Stan Dosso
• Lecture: Geoacoustic inversion with optimal transport [Invited]
  Paper ID: 2101
  Author(s): Zoi-Heleni Michalopoulou
  Presenter: Zoi-Heleni Michalopoulou
  Abstract: Matching received signals at sets of hydrophones with time-series computed with sound propagation models is an approach often implemented for geoacoustic inversion in ocean acoustics. The synthetic signals, typically referred to as replicas, are calculated for different values of properties of the environment. The best fit between the real and synthetic times-series leads to the identification of the optimal property values. To obtain the best fit, it is often sought to minimize the Euclidean distance between replicas and measured data. The structure of the Euclidean distance presents us with challenges, however, as it may be characterized by local minima which complicate multi-dimensional optimization searches for the identification of the parameter values that yield the global minimum. Optimal transport, relying on the minimization of different similarity measures, provides us with an alternative approach, leading to functions that are simpler to minimize than the Euclidean distance. In this work, we study the use of optimal transport in geoacoustic inversion and assess its performance in several propagation scenarios.
• Corresponding author: Dr Zoi-Heleni Michalopoulou
  Affiliation: Department of Mathematical Sciences, New Jersey Institute of Technology
  Country: United States