A Sensitivity Study of the Parabolic Equation Model to Bottom Type and Geometry.

Abstract

The effect of several types of flat and sloping bottom configurations and bottom geophysical properties are studied using the parabolic equation model in a sensitivity analysis to determine the importance of such environmental parameters. Low frequency and fixed source and receiver depths have been used along with a single sound speed profile, in both deep and shallow water cases. For a fully absorbing bottom, only the refracted energy paths remain, making the model insensitive to the bottom geometry. For a perfectly reflecting bottom, both the refracted and the reflected paths were present in deep water tests, and only the reflected paths in shallow water cases. For the sloping bottom geometries a periodic interference pattern was found in transmission loss, with a wavelength inversely related to the bottom slope. A more realistic partially-absorbing bottom proved to have properties very similar to those of the perfectly reflecting bottom. (Author)

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Document Details

Document Type
Technical Report
Publication Date
Mar 01, 1981
Accession Number
ADA102661

Entities

People

  • Antonio Ruiz Canavate

Organizations

  • Naval Postgraduate School

Tags

DTIC Thesaurus Topics

  • Acoustic Propagation
  • Acoustic Waves
  • Acoustics
  • Algorithms
  • Bottom Loss
  • Convergence Zones (Sonar)
  • Differential Equations
  • Measurement
  • Oceanography
  • Oceans
  • Plastic Explosives
  • Seabed
  • Shallow Water
  • Transmission Loss
  • Underwater Sound
  • United States
  • Wave Equations

Readers

  • Computational Modeling and Simulation
  • Electromagnetic Wave Scattering and Antenna Radiation Engineering
  • Oceanography.