ACOUSTIC PROPAGATION LOSS PREDICTIONS FOR A SITE ON THE BERMUDA RISE AT LOW AND VERY LOW FREQUENCIES

Authors
  1. Cotaras, F.D.
  2. Theriault, J.A.
Corporate Authors
Defence Research Establishment Atlantic, Dartmouth NS (CAN)
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 30N 69W. 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.
Report Number
DREA-TM-92-215 — Technical Memorandum
Date of publication
15 Jun 1992
Number of Pages
46
DSTKIM No
92-02883
CANDIS No
125371
Format(s):
Hardcopy;Originator's fiche received by DSIS

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