Acoustical Physics

, Volume 56, Issue 5, pp 684–692

Simulation of low-frequency sound propagation in an irregular shallow-water waveguide with a fluid bottom

Ocean Acousticics. Hydroacoustics

DOI: 10.1134/S1063771010050143

Cite this article as:
Gulin, O.É. Acoust. Phys. (2010) 56: 684. doi:10.1134/S1063771010050143


A further development of a previously proposed approach to calculating the sound field in an arbitrarily irregular ocean is presented. The approach is based on solving the first-order causal mode equations, which are equivalent to the boundary-value problem for acoustic wave equations in terms of the cross-section method. For the mode functions depending on the horizontal coordinate, additional terms are introduced in the cross-section equations to allow for the multilayer structure of the medium. A numerical solution to the causal equations is sought using the fundamental matrix equation. For the modes of the discrete spectrum and two fixed low frequencies, calculations are performed for an irregular two-layer waveguide model with fluid sediments, which is close to the actual conditions of low-frequency sound propagation in the coastal zone of the oceanic shelf. The calculated propagation loss curves are used as an example for comparison with results that can be obtained for the given waveguide model with the use of adiabatic and one-way propagation approximations.

Copyright information

© Pleiades Publishing, Ltd. 2010

Authors and Affiliations

  1. 1.Il’ichev Pacific Oceanological Institute, Far East DivisionRussian Academy of SciencesVladivostok, Primor’eRussia