Simple Harmonic Source in a Slightly Irregular Waveguide,

Abstract

The normal mode solution of the problem of the radiation field of a simple harmonic source in a layered waveguide is extended to the case of small irregularities in the surface. The theory is used to calculate the radiation field of a 147.8 cps simple harmonic source in about 20 m of shallow water over a thick layer of unconsolidated sediment. The calculations indicate that the effects of small surface roughness, i.e., rms wave height about half m. are to increase the attenuation as a function of range and to decrease the mode interference maxima and minima. The experimental dependence of the acoustical pressure upon source distance is similar to that calculated with the theory. (Author)

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Document Details

Document Type
Technical Report
Publication Date
Feb 27, 1964
Accession Number
ADA068771

Entities

People

  • C. S. Clay

Organizations

  • Columbia University

Tags

Communities of Interest

  • Materials and Manufacturing Processes

DTIC Thesaurus Topics

  • Amplitude
  • Attenuation
  • Continuous Waves
  • Experimental Data
  • Frequency
  • Frequency Shift
  • New York
  • Radiation
  • Reflection
  • Scattering
  • Sediments
  • Shallow Water
  • Surface Roughness
  • Surface Waves
  • Thickness
  • Water
  • Waves

Fields of Study

  • Physics

Readers

  • Atmospheric Science / Meteorology, specifically Wind Wave Turbulence.
  • Microwave Engineering.