Random-Bottom Structural and Topographical Effects on Sound Transmission in a Shallow Channel

Abstract

Effects of horizontal stochastic bottom structure on acoustic intensity in an isospeed ocean have been studied. The bottom density and sound speed were taken to be random and ray theory was used. In this study we add a rough water bottom interface, consisting of large scale, two dimensional random facets upon which small scale roughness may be superimposed. Each facet is assumed to possess small random depth deviation, slope, and curvature. Initially, acoustic rays are taken to be specularly reflected from the facet bottom, and derive expressions for the mean and variance of incoherent intensity at a point receiver for a transmitted cw signal. The results are sufficiently general to permit their use with different bottom acoustic models, from which the MacKenzie theory is selected. Relative effects of structure and topography are compared. Subsequently, small scale roughness is superimposed on the facets, and the added consequences of scattering are considered. Keywords: Underwater sound transmission; Ray theory; Random bottom structure; and Random bottom topography.

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Document Details

Document Type
Technical Report
Publication Date
May 31, 1986
Accession Number
ADA168479

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 Propagation
  • Acoustic Waves
  • Acoustics
  • Electrical Engineering
  • Engineering
  • Geography
  • Physics Laboratories
  • Random Variables
  • Reflection
  • Rhode Island
  • Scattering
  • Security
  • Sound Transmission
  • Two Dimensional
  • Underwater Sound
  • Waves

Readers

  • Approximation Theory.
  • Oceanography.
  • Theoretical Analysis.