Sound fluctuations resulting from mode coupling in shallow-water internal waves

V. A. Grigor'Ev, B. G. Katsnel'Son

Research output: Contribution to journalArticlepeer-review


We conduct a theoretical analysis and numerical simulation of fluctuations of low-frequency signals propagating in shallow water in the presence of nonlinear internal waves moving approximately along the acoustic track. It is believed that mode coupling causes the fluctuations. We show that in the fluctuation spectra there are characteristic frequencies that are proportional to the motion velocity of solitons along the track. We calculate the sound field using single- and multimode sources and analyze the frequency-mode composition of the field responsible for the maximum and minimum fluctuations. We analyze the so-called dominant fluctuation frequency introduced previously by the authors, which corresponds to fluctuations with the maximum amplitude in the given frequency range and for the given set of modes. We compare the calculation results with estimates obtained previously by the authors within the framework of ray theory.

Original languageEnglish
Pages (from-to)287-296
Number of pages10
JournalAcoustical Physics
Issue number3
StatePublished - May 2014

Bibliographical note

Funding Information:
The work was carried out with support from the Russian Foundation for Basic Research (projects nos. 12 05 00887 a, 11 02 00779 a).


  • dominant frequency
  • fluctuations
  • low-frequency signals
  • mode coupling
  • nonlinear internal waves
  • shallow-water acoustics

ASJC Scopus subject areas

  • Acoustics and Ultrasonics


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