The Application of Coupled-Mode Theory to Propagation in Shallow Water with Randomly Varying Sound Speed

Abstract

Sound propagation in the Baltic Sea cannot be described correctly by range independent propagation models, even for areas with more or less constant water depths. The reason is the inability of such models to take account of the effect of forward scattering of sound produced by horizontal variations in the speed of the sound. Schneider and Sellschopp have simulated the forward- scattering effect by applying a parabolic equation method in conjunction with a Monte Carlo ray tracing program (MOCASSIN). This paper treats forward scattering in the normal mode concept, using the mode coupling formulation. The mode coupling was added to the SUPERSNAP normal-mode code. Comparisons are made with the Schneider-Sellschopp calculations and with real data. Keywords: Baltic; Coupled-mode theory; Mode coupling modelling; Monte Carlo ray tracing programs program; Normal mode theory; Propagation scattering; Shallow water; Sound speed; Source localisation methods; Transmission loss.

Open PDF

Document Details

Document Type
Technical Report
Publication Date
Jun 01, 1987
Accession Number
ADA183630

Entities

People

  • Rolf Thiele

Organizations

  • SACLANT ASW Research Centre

Tags

Communities of Interest

  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Baltic Sea
  • Computational Science
  • Differential Equations
  • Eigenvectors
  • Equations
  • Forward Scattering
  • Frequency
  • Internal Waves
  • Measurement
  • Nato
  • Partial Differential Equations
  • Phase Velocity
  • Scattering
  • Shallow Water
  • Transmission Loss
  • Wave Equations
  • Wave Propagation

Fields of Study

  • Physics

Readers

  • Acoustical Oceanography.
  • Electromagnetic Wave Scattering and Antenna Radiation Engineering