General Effects of Current and Sound-Speed Variations on Short-Range Acoustic Transmission in Cyclonic Eddies.

Abstract

The effects of sound-speed and current variations induced by a mesoscale cyclonic eddy on short-range propagation are considered. A parametric eddy model is used to determine acoustically-relevant eddy environmental effects, so that eddy-acoustical effects can be determined for eddies of arbitrary size, strength, and position. Approximations to sound-speed and current structures are used to investigate eddy effects on the three-dimensionality of rays and on ray types. The influence of current and sound-speed variations on travel time is examined, and accurate expressions for per-ray phase variation are obtained. Examples are presented illustrating effects of source-receiver position and orientation on per-ray phase shifts and relative phase spreading of arrivals. Also, general results are presented which illustrate the variations of eddy-acoustical effects as functions of source-receiver range and of eddy size and strength. (Author)

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Document Details

Document Type
Technical Report
Publication Date
Jul 01, 1979
Accession Number
ADA072765

Entities

People

  • M. J. Jacobson
  • R. F. Henrick
  • William L. Siegmann

Organizations

  • Rensselaer Polytechnic Institute

Tags

Communities of Interest

  • Air Platforms
  • Counter IED
  • Weapons Technologies

DTIC Thesaurus Topics

  • Bessel Functions
  • Bodies Of Water
  • Coordinate Systems
  • Eddy Currents
  • Elevation
  • Geometry
  • Lepidoptera
  • Measurement
  • Military Research
  • New York
  • Oceans
  • Orientation (Direction)
  • Perturbations
  • Phase Shift
  • Three Dimensional
  • Travel Time
  • Two Dimensional

Readers

  • Acoustical Oceanography.
  • Coastal Oceanography