2025_programme: Modeling vertical and short-range seismo-acoustic propagation using the wave number integration technique

• Day: June 16, Monday
    Location / Time: C. THALIA at 15:30-15:50
• Last minutes changes: -
• Session: 09. Modeling techniques for underwater acoustic scattering and propagation (including 3D effects)
  Organiser(s): Boris Katsnelson, Pavel S. Petrov
  Chairperson(s): Boris Katsnelson, Sven Ivansson, Pavel Petrov
• Lecture: Modeling vertical and short-range seismo-acoustic propagation using the wave number integration technique [Invited]
  Paper ID: 2309
  Author(s): Nathan Ivkovic, Xavier Cristol, Iannis Bennaceur, Benoît Oudompheng, Dominique Fattaccioli
  Presenter: Nathan Ivkovic
  Abstract: Several classical numerical models for the calculation of low-frequency underwater acoustic fields, including either modal or wave-number integration approaches, are widely used for a variety of oceanographic applications. However, these models, including the most well known, suffer from significant limitations and instabilities, especially in the vertical direction below the sound source.\nUnder normal incidence and at short horizontal distances, the acoustic field in the water column interacts intensively with multiple bounces within the seafloor down to great depths. Consequently, a first difficulty is the need for a detailed description of the acoustic and elastic properties of the sedimentary layers beneath the seafloor. To solve this problem, we use public databases available online: the worldwide CRUST1 grid and the Western Mediterranean SEANOE seismo-acoustic profile collection, both of which provide densities, compressional and shear velocities in three (CRUST1) or five (SEANOE) homogeneously averaged layers. These data are processed to add plausible vertical gradients and attenuation profiles within the layers: this is done using Hamilton's classic published trends.\nWe have developed a new model based on an innovative computational approach of the wave number integration technique. The new model, called TAMINO, is compared with other wave number integration Fast-Field tools such as OASES and SCOOTER, as well as normal mode tools such as KRAKEN and MOCTESUMA.\nThe focus of this paper is firstly on the mathematical foundations of the TAMINO method. A detailed comparison with the previously cited well-established academic models is performed for validation purposes. Second, the model will be evaluated experimentally, in combination with the revised CRUST1 and SEANOE databases, by comparing its predictions with narrowband signals collected from the Mediterranean Sea.\n
• Corresponding author: Mr Nathan Ivkovic
  Affiliation: THALES DMS UWS
  Country: France