Modeling Propagation Loss in Shallow Water Using a Finite Difference Parabolic Equation

Abstract

An implicit finite difference version of the 15 degree parabolic equation first developed by Claerbout was used to model acoustic wave propagation in shallow water. The algorithm uses a variable grid spacing in the depth as well as range direction, resulting in rapid execution. The water-sediment interface was simulated by an Epstein layer. An attempt to model propagation loss data on the continental slope and shelf near Nova Scotia was unsuccessful because of a lack of adequate environmental data, as well as deficiencies in the modeling method. However, from modeling, it was found that the sediment properties controlled propagation loss near the cutoff frequency.

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Document Details

Document Type
Technical Report
Publication Date
Dec 01, 1982
Accession Number
AD1010722

Entities

People

  • Brian T. Iwatake

Organizations

  • University of HawaiĘ»i System

Tags

DTIC Thesaurus Topics

  • Acoustic Waves
  • Algorithms
  • Continental Slopes
  • Deficiencies
  • Equations
  • Frequency
  • Frequency Shift
  • Nova Scotia
  • Sediments
  • Shallow Water
  • Water
  • Wave Propagation
  • Waves

Readers

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

Technology Areas

  • Space