Acoustic Warfare: Bubble Clouds

Abstract

In this report, we survey the basic ingredients that go into the bubble cloud hypothesis for the enhanced acoustic backscatter seen at high enough frequency and wind speed. The basic picture that has been proposed is that spilling waves generate foamy water which is then subducted downward, modifying the local sound velocity. One proposed mechanism for the downwelling current necessary to accomplish the required subduction is the Langmuir circulation cell; we will see that this is sufficient but other mechanisms may also contribute. Our discussion naturally breaks up into the hydrodynamics issues related to bubble generation and subduction and to acoustic issues related to scattering from a given distribution of air density below the surface. acoustic backscatter, bubble clouds, Laplace Green, langmuir, circulations.

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Document Details

Document Type
Technical Report
Publication Date
Oct 01, 1992
Accession Number
ADA257903

Entities

People

  • H. Levine

Organizations

  • MITRE Corporation

Tags

Communities of Interest

  • C4I
  • Energy and Power Technologies
  • Materials and Manufacturing Processes

DTIC Thesaurus Topics

  • Acoustic Warfare
  • Backscattering
  • Demographic Cohorts
  • Doppler Effect
  • Equations
  • Frequency
  • Hydrodynamics
  • Measurement
  • Military Research
  • National Security
  • Naval Warfare
  • Physics
  • Scattering
  • Security
  • Warfare
  • Waves
  • Wind

Readers

  • Atmospheric Remote Sensing.
  • Atmospheric Science / Meteorology, specifically Wind Wave Turbulence.
  • Joint Military Operations and Doctrine.