SNAP: The SACLANTCEN Normal-Mode Acoustic Propagation Model

Abstract

A sound-propagation model based on normal mode theory is described. The model is designed to give a realistic treatment of the ocean environment, including arbitrary sound-speed profiles in both water column and bottom, compressional and shear wave attenuation, scattering at rough boundaries, and range dependence. Furthermore, the model has a flexible input/output structure that facilitates model handling and provides users with a wide choice of computational (output) options, ranging from plots of sound-speed profiles and individual mode functions to contoured transmission loss versus depth and range or versus frequency and range. The computer code is written in FORTRAN V with a few routines in NUALGOL. The version documented here runs on a UNIVAC 1106.

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Document Details

Document Type
Technical Report
Publication Date
Jan 15, 1979
Accession Number
ADA067256

Entities

People

  • Finn B. Jensen
  • Melchiorre C. Ferla

Organizations

  • SACLANT ASW Research Centre

Tags

Communities of Interest

  • C4I
  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Acoustic Fields
  • Acoustic Propagation
  • Attenuation
  • Bottom Loss
  • Computations
  • Computer Programs
  • Computers
  • Convergence Zones (Sonar)
  • Deep Water
  • Eigenvalues
  • Losses
  • Plastic Explosives
  • Seabed
  • Shallow Water
  • Transmission Loss
  • Two Dimensional
  • Water

Fields of Study

  • Physics

Readers

  • Acoustical Oceanography.
  • Computer Science.
  • Wave Propagation and Nonlinear Chaotic Dynamics.