Underwater acoustic beam dynamics

Research output: Contribution to journalArticle

7 Scopus citations

Abstract

Ray- and mode-based theoretical predictions of the spreads of directionally narrow beams are presented and compared to parabolic-equation-based simulations in deep-ocean environments. Both the spatial and temporal spreads of beams are considered. The environments considered consist of a range-independent deep-ocean background sound channel on which a highly structured sound-speed perturbation, associated with either internal waves or homogeneous isotropic single-scale turbulence, is superimposed. The simulation results are shown to be in good agreement with simple theoretical expressions which predict that beam spreading, in both the unperturbed and perturbed environments, is largely controlled by a property of the background sound channel-the ray-based stability parameter α or the asymptotically equivalent mode-based waveguide invariant Β. These results are consistent with earlier results showing that wavefield structure and stability are largely controlled by α (or Β).

Original languageEnglish (US)
Pages (from-to)80-91
Number of pages12
JournalJournal of the Acoustical Society of America
Volume126
Issue number1
DOIs
StatePublished - Aug 10 2009

ASJC Scopus subject areas

  • Arts and Humanities (miscellaneous)
  • Acoustics and Ultrasonics

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