Influence of Horizontally-Random Bottom Structure on Acoustic Intensity in a Shallow Ocean

Abstract

Effects of a model for random bottom structure on acoustic intensity in isospeed shallow water are studied. The randomness is due to stochastic variations in the bottom density and sound speed in the horizontal direction beneath a plane water-bottom interface. Ray geometry, spreading loss, and bottom loss and phase shift are examined in order to derive formulas for mean intensity and the variance of intensity. The expressions obtained are sufficiently general to permit their use with different bottom-acoustic models of sound reflection. In this paper, for illustrative and comparative purposes two such models, one developed by MacKenzie and the other by Rayleigh, are considered. The distinctive acoustic consequences of bottoms of different density mean, variance, and horizontal correlation are discussed, as are comparisons of results for the two bottom-reflection models. Intensity moments are obtained also for differing source-receiver range and water depth.

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Document Details

Document Type
Technical Report
Publication Date
Apr 15, 1984
Accession Number
ADA141383

Entities

People

  • C. E. Ashley
  • M. J. Jacobson
  • William L. Siegmann

Organizations

  • Rensselaer Polytechnic Institute

Tags

Communities of Interest

  • Air Platforms
  • C4I
  • Materials and Manufacturing Processes
  • Space
  • Weapons Technologies

DTIC Thesaurus Topics

  • Acoustic Phenomena
  • Acoustic Properties
  • Acoustic Waves
  • Acoustics
  • Aspect Ratio
  • Atmospheric Sciences
  • Bottom Bounce
  • Bottom Loss
  • Engineering
  • Frequency
  • Geography
  • Geometry
  • Physics Laboratories
  • Reflection
  • Security
  • Shallow Water
  • Underwater Acoustics

Readers

  • Acoustical Oceanography.
  • Statistical inference.