2025_programme: Horizontal space-time rays and refraction of sound pulses in shallow water waveguide.

• Day: June 16, Monday
    Location / Time: C. THALIA at 11:40-12:00
• Last minutes changes: Cancelled
• 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: Horizontal space-time rays and refraction of sound pulses in shallow water waveguide.
  Paper ID: 2182
  Author(s): Denis Manulchev, Aleksandr Kaplun, Boris Katsnelson
  Presenter: Boris Katsnelson
  Abstract: In the paper, we apply developed theory of vertical modes and space-time horizontal rays to some situations to compare numerical and experimental results. Such results are provided for pulse propagation in horizontally inhomogeneous shallow-water waveguides and are demonstrated for several models, such as a coastal wedge and a temperature front, and corresponding experimental situations, including the SW06 and ASIAEX experiments. In these experiments, the spatial inhomogeneity was caused by a moving train of nonlinear internal waves.. Construction of space-time horizontal rays for each vertical mode is produced by the solution of the corresponding 3D Hamilton equations (horizontal coordinates and time). Characteristics of the sound field in the horizontal plane (amplitude and phase fronts, group and phase velocities for individual waveguide modes) are studied. Spectral and temporal characteristics of an acoustic linearly frequency-modulated pulse (270–330 Hz) with a duration of ~ 2 sec which reflects from the approaching front of an internal wave are also considered. Acoustic signals recorded by vertical and horizontal antennas are analyzed and compared with numerical modeling.\nWork was supported by ISF, grant 946/20
• Corresponding author: Prof Boris Katsnelson
  Affiliation: University of Haifa
  Country: Israel