2023_programme: Numerical and analytical study of broadband mode coupling induced by a local inhomogeneity in a shallow-water waveguide

• Session: 07. Modeling techniques for underwater acoustic scattering and propagation (including 3D effects)
  Organiser(s): Boris Katsnelson and Pavel S. Petrov
• Lecture: Numerical and analytical study of broadband mode coupling induced by a local inhomogeneity in a shallow-water waveguide
  Paper ID: 2019
  Author(s): Lunkov Andrey, Grigorev Valery, Sidorov Danila, Shermeneva Maria
  Presenter: Lunkov Andrey
  Abstract: A coupled normal-mode approach for the broadband acoustic field prediction is applied to study sound scattering by a local inhomogeneity at a stationary track in a shallow-water waveguide of 40 m depth. Long-range (up to 10 km) propagation from a point sound source to a vertical receiving array is examined at a frequency of 50 to 1000 Hz. We consider the following types of inhomogeneities: underwater ridge and canyon, internal solitary wave, ice keel, and sediment structure feature. These local inhomogeneities induce mode coupling that can be seen as oscillations of the normal mode amplitude in the frequency domain. Analytical estimates and numerical simulation show that the period of oscillations is unambiguously related to the distance between a sound source and inhomogeneity, which can be used for its remote sensing at a stationary acoustic track. The possibility of inhomogeneity type identification is discussed.
    Download the full paper
• Corresponding author: Dr Andrey Lunkov
  Affiliation: Prokhorov General Physics Institute of the Russian Acedemy of Sciences
  Country: Russian Federation
  e-mail: