Geoacoustic Sensitivity Study Phase II and Phase III: Final Report

PDF

Authors
  1. Giles, P.M.
  2. Dosso, S.
  3. McCammon, D.
Corporate Authors
Defence R&D Canada - Atlantic, Dartmouth NS (CAN);General Dynamics Canada Ltd, Ottawa ONT (CAN)
Abstract
This report covers the work carried out by General Dynamics Canada during phases II and III of the Geoacoustic Sensitivity Study. The report documents the methods and outcomes of the study. The study considered variations that are created in the underwater acoustic pressure field, in specified environments, when various perturbations are applied to the environmental parameters. Three numerical models (BELLHOP, SAFARI, and ORCA) were used extensively in this study. The environments of interest were selected to represent the Emerald Basin region of the Scotian Shelf, and the Malta Plateau region of the Mediterranean Sea. The study determined, for each environment and at two different frequencies, a relative ranking of the sensitivity of the acoustic field to geoacoustic parameters. The experiments also considered the linearity of the sensitivity; an important conclusion is that the pressure perturbation as defined in this work shows a linear dependence on the magnitude of most typical geoacoustic perturbations. The project also measured the range and depth dependence of the sensitivity. The study also included experiments on the sensitivity to range-independent and range dependent water column properties, specifically depth and sound speed profile. The sound speed profile perturbations were selected to mimic typical oceanographic variability. The resulting pressure perturbations are large compared to the sensitivities of geoacoustic parameters, and are nonlinear functions of th

Il y a un résumé en français ici.

Keywords
Environmental variability;Acoustic propagation modeling;Geoacoustic data
Report Number
DRDC-ATLANTIC-CR-2006-066 — Contractor Report
Date of publication
01 Sep 2006
Number of Pages
178
DSTKIM No
CA028415
CANDIS No
526602
Format(s):
CD ROM

Permanent link

Document 1 of 1

Date modified: