Accession Number:

ADA255445

Title:

Acoustic Propagation Loss Predictions for a Site on the Bermuda Rise at Low and Very Low Frequencies

Descriptive Note:

Technical memo.

Corporate Author:

DEFENCE RESEARCH ESTABLISHMENT ATLANTIC DARTMOUTH (NOVA SCOTIA)

Report Date:

1992-06-01

Pagination or Media Count:

46.0

Abstract:

Low 10 - 100 Hz and very low 1 - 10 Hz frequency acoustic propagation loss is predicted for a site on the Bermuda Rise near 30 deg N 69 deg W. An extensive survey of the open literature is reported, and a geo- acoustic model of the acoustic environment at the site is developed. The results of a brief numerical investigation of the effect of shear waves and detailed sub-bottom layering on the acoustic propagation-loss predictions are discussed. The acoustic propagation-loss model used is SAFARI, which accounts for shear waves in the sediment but assumes a range-invariant environment. The propagation-loss predictions for 5, 10, 20, and 50 Hz are then presented. Also presented are predictions of the reflection loss in the form of grey-scale plots as a function of frequency and grazing angle. No comparison with experimental data is attempted.

Subject Categories:

  • Physical and Dynamic Oceanography
  • Acoustics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE