Acoustic Propagation Loss Predictions for a Site on the Bermuda Rise at Low and Very Low Frequencies
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.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jun 01, 1992
- Accession Number
- ADA255445
Entities
People
- Frederick D. Cotaras
- James A. Theriault
Organizations
- Defence Research and Development Canada