Scattering from a Rough Sedimental Seafloor Containing Shear and Layering, as Determined by Perturbation Theory

Abstract

First-order perturbation theory is applied to reverberation from a rough sedimental seafloor. In addition to existing approaches, the seafloor is allowed to be shear-supporting or to be layered. Scattering strengths are derived for both monostatic and bistatic reverberation, and compared with results from a non-layered fluid bottom. By exceeding some 350 ms (expn -1), shear-wave velocity significantly influences scattering strength for angles below the critical angle of total reflection. Layering, as modelled by a two-layer fluid seafloor, mainly influences scattering at grazing angles just above critical.

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Document Details

Document Type
Technical Report
Publication Date
Jul 01, 1993
Accession Number
AD1119716

Entities

People

  • H. H. Essen

Tags

Communities of Interest

  • Advanced Electronics
  • Air Platforms
  • Materials and Manufacturing Processes

DTIC Thesaurus Topics

  • Acoustic Fields
  • Acoustic Frequencies
  • Acoustic Scattering
  • Acoustic Waves
  • Acoustics
  • Backscattering
  • Fluids
  • Frequency
  • Grazing Angles
  • Low Angles
  • Particles
  • Perturbation Theory
  • Reflection
  • Reverberation
  • Scattering
  • Seabed
  • Secondary Waves
  • Sedimentary Rocks
  • Two Dimensional
  • Water
  • Waves

Fields of Study

  • Environmental science

Readers

  • Acoustical Oceanography.
  • Marine Propulsion Engineering and Naval Architecture