Three Dimensional, Finite-Difference Modeling to Determine the Dominant Backscatter from Seafloor Topography and Bottom Heterogeneity.

Abstract

Specific objectives of the research were: (1) to add intrinsic attenuation to our Numerical Scattering Chamber (NSC) code, (2) to participate in ASA and NOARL sponsored benchmark studies for range dependent media, (3) to apply the NSC to scattering from canonical models to identify the physical mechanisms responsible for low angle back scatter, (4) to address the issue of stochastic versus deterministic methodologies for seafloor scattering, (5) to combine finite differences with ray theory in a hybrid scheme, (6) three dimensional finite difference modeling of facets, sediment cover, volume heterogeneities, Goff-Jordan seafloors, and ARSRP bright spot areas, and (7) to explain the relationship between deterministic features observed in the ARSRP '93 Acoustics Experiment and the geological structure of the seafloor. In addressing the last objective we chose to focus on the match filtered beam data for the wide band LFM 5sec chirps (200-255Hz). We studied initially the 1/2CZ data at Site A.

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Document Details

Document Type
Technical Report
Publication Date
Oct 23, 1995
Accession Number
ADA311193

Entities

People

  • R. A. Stephen

Organizations

  • Woods Hole Oceanographic Institution

Tags

DTIC Thesaurus Topics

  • Abstracts
  • Acoustic Scattering
  • Acoustics
  • Backscattering
  • Geometry
  • Grazing Angles
  • Heterogeneity
  • Low Angles
  • Reverberation
  • Scattering
  • Seabed
  • Three Dimensional
  • Two Dimensional

Fields of Study

  • Physics

Readers

  • Acoustical Oceanography.
  • Computational Fluid Dynamics (CFD)