Comments and Issues Pertinent to SHARPS III Near-Surface Propagation Modeling

Abstract

The propagation submodels of SHARPS III are assessed for their applicability to near-surface sound velocity conditions. The near-surface channel configurations addressed by the current version of SHARPS are too limited. The options are limited to surface ducts and subsurface ducts, as modeled by the Advanced AMOS equations. All other channel configurations are handled by ray theory. A SHARPS input known as the sonic layer depth (SLD) is demonstrated to be in occasional contrast with the layer depth of a classical surface duct. Simple expressions based on ray theory and phase integral melthods are used to demonstrate the sensitivity of selected acoustic parameters to variations of in-layer sound velocity gradient. Changes that have been made to the original AMOS equations are reviewed, and results from a recent evaluation of several operational surface duct models are presented.

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Document Details

Document Type
Technical Report
Publication Date
Oct 01, 1983
Accession Number
ADA139765

Entities

People

  • R. W. Mcgirr

Organizations

  • United States Naval Research Laboratory

Tags

Communities of Interest

  • Ground and Sea Platforms
  • Weapons Technologies

DTIC Thesaurus Topics

  • Acoustics
  • Classification
  • Computers
  • Detection
  • Eigenvalues
  • Equations
  • Measurement
  • Military Research
  • Naval Operations
  • Physics
  • Physics Laboratories
  • Reflection
  • Research Facilities
  • Scattering
  • Security
  • Statistics
  • Wave Propagation

Fields of Study

  • Physics

Readers

  • Acoustical Oceanography.
  • Computational Modeling and Simulation
  • Wave Propagation and Nonlinear Chaotic Dynamics.