ANZUS Eddy II: Further Acoustic Modeling of an East Australian Current Eddy
Abstract
This document presents the oral and visual presentation entitled 'ANZUS Eddy II: Further Acoustic Modeling of an East Australian Current Eddy,' presented at the Tenth International Congress on Acoustics, 9-16 July 1980 in Sydney, Australia. The dynamics of the South Coral and Tasman Seas has recently been shown to be governed by the East Australian Current and the Tasman Front; the current flowing south along the coast of Australia and then turning east around 34 degrees S to feed the front that has the form of a planetary wave with a zonal wavevector. This planetary wave spawns warm core eddies to the south and cold core eddies to the north in a regular manner, conforming to theoretical postulates that such systems are controlled by a conservation of potential vorticity in which the linear and nonlinear effects are approximately of equal magnitude. These features, which cause a perturbation to the ocean's regular sound speed structure, can be scaled in a canonical manner, allowing a deterministic evaluation of their effects on an acoustic wave propagating through them. These effects have been calculated in the frequency band 30 Hz to 3 kHz using range dependent propagation models and show significant departures from an unperturbed ocean; the results have a direct application in the inverse problem of acoustic tomography.
Document Details
- Document Type
- Technical Report
- Publication Date
- Sep 29, 1981
- Accession Number
- ADA105590
Entities
People
- D. G. Browning
- P. D. Scully-power
Organizations
- Naval Underwater Systems Center