2025_programme: Time-frequency structure of normal modes in range-dependent waveguides: numerical modeling and field experiment.
- Day: June 16, Monday
Location / Time: C. THALIA at 12:20-12:40
- 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: Time-frequency structure of normal modes in range-dependent waveguides: numerical modeling and field experiment. [Invited]
Paper ID: 2215
Author(s): Danila Sidorov, Devi Bodjona, Dmitrii Kovzel, Vladimir Bezotvetnykh, Andrey Lunkov
Presenter: Danila Sidorov
Abstract: Numerical simulation is applied to study a broadband acoustic field, formed by a point source at a frequency of 200 to 2000 Hz in range-dependent waveguides with a seasonal thermocline. Two shallow-water waveguide models with varying bathymetry are considered: 1) with a smooth bottom depth variation, 2) with a strong bathymetric feature (barrier). Normal mode theory and parabolic equation simulations are used to study the effect of mode coupling in these scenarios. In the range-dependent waveguide with the strong inhomogeneity, the coupling effect appears in oscillations of modal amplitudes ratio in the frequency domain, and additional modal arrivals in the time domain. These results were confirmed in a field experiment at two 2-km acoustic tracks in the coastal zone of the Japan Sea, where time-frequency structures of normal modes were extracted using correlation processing at a vertical receiving array. The work was supported by the Russian Science Foundation, project No. 22-72-10121 (https://rscf.ru/en/project/22-72-10121/).
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This paper is a candidate for the "Prof. Leif Bjørnø Best Student Paper Award (for students under 35)"
- Corresponding author: Mr Danila Sidorov
Affiliation: Prokhorov General Physics Institute of the Russian Academy of Sciences
Country: Russian Federation
