IFD (Implicit Finite Difference): Interfaced with Harvard Open Ocean Model Forecasts

Abstract

In 1982, the implicit finite difference (IFD) computer model was developed by Lee and Botseas at NUSC for solving the parabolic wave equation. The IFD model was designed to predict acoustics propagation in both range-dependent and range-independent undersea environments. Given an environment, the IFD model marches the acoustics solution in the water column forward, step-by-step, until maximum range has been reached. The capability to interface the IFD computer model with mesoscale forecasts generated by the Harvard Open Model is announced. Given the latitude and longitude of the source location, the IFD model extracts from the 3-dimensional Harvard data set sound speed profiles encountered in the direction of propagation. Contour plots are set containing both warm- and cold-core eddies in the vicinity of the Gulf Stream. Acoustic propagation loss through a cold-core eddy is presented. A listing of the subroutine that links IFD with the Harvard data set is included. Keywords: Eddies fluid mechanics; Acoustic data; Cold core eddy; Gulf Stream; Mesosphere forecasts; Warm core eddy.

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Document Details

Document Type
Technical Report
Publication Date
May 30, 1989
Accession Number
ADA210521

Entities

People

  • Ding Lee
  • George Botseas
  • William L. Siegmann

Organizations

  • Naval Underwater Systems Center

Tags

Communities of Interest

  • Air Platforms
  • Weapons Technologies

DTIC Thesaurus Topics

  • Acoustic Propagation
  • Acoustic Waves
  • Acoustics
  • Computers
  • Data Sets
  • Environment
  • Equations
  • Fluid Mechanics
  • Geographic Regions
  • Geometry
  • Gulf Stream
  • Latitude
  • Longitude
  • Losses
  • Security
  • Three Dimensional
  • Wave Equations

Fields of Study

  • Environmental science

Readers

  • Marksmanship and Weaponry.
  • Oceanography.
  • Wave Propagation and Nonlinear Chaotic Dynamics.