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Author Flatte, S.M. ♦ Colosi, J.A.
Sponsorship IEEE Oceanic Engineering Society
Source IEEE Xplore Digital Library
Content type Text
Publisher Institute of Electrical and Electronics Engineers, Inc. (IEEE)
File Format PDF
Copyright Year ©1976
Language English
Subject Domain (in DDC) Natural sciences & mathematics ♦ Earth sciences ♦ Geology, hydrology & meteorology
Subject Keyword Anisotropic magnetoresistance ♦ Acoustic distortion ♦ Acoustic pulses ♦ Acoustic propagation ♦ Oceans ♦ Fluctuations ♦ Acoustic waves ♦ Acoustic scattering ♦ Predictive models ♦ Stability ♦ rays ♦ Acoustic scattering ♦ internal waves
Abstract Observations of broadband sound propagation through the deep ocean, rich in sound-speed inhomogeneities, show that the double accordion acoustic wavefront pattern expected from model predictions without inhomogeneities is remarkably stable. This stability is found for propagation ranges up to 5000 km for acoustic frequencies of 28-84 Hz, and up to 1200-km range for 250 Hz. While the observed wavefront pattern is stable, the acoustic intensity along the wavefront is not. Furthermore, significant vertical extension of turning point caustics has been observed. This line of evidence suggests that the scattering is anisotropic in the sense that it is primarily <i>along</i> the wavefront, rather than across it. In addition, ray and parabolic equation simulations of acoustic propagation through ocean internal waves obeying the Garrett-Munk (GM) internal wave spectrum reinforce this notion of the anisotropy of the wavefront distortion. This paper presents a ray-based physical model for this phenomenon based on small angle forward scattering and provides analytic formulas to predict the wavefront distortions caused by ocean internal waves and other ocean processes. Further applications include out-of vertical-plane scattering and wavefront healing near seamounts or islands.
Description Author affiliation :: Dept. of Phys., Univ. of California, Santa Cruz, CA, USA
Author affiliation :: Dept. of Oceanogr., Naval Postgrad. Sch., Monterey, CA, USA
ISSN 03649059
Education Level UG and PG
Learning Resource Type Article
Publisher Date 2008-10-01
Publisher Place U.S.A.
Rights Holder Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Volume Number 33
Issue Number 4
Size (in Bytes) 466.13 kB
Page Count 12
Starting Page 477
Ending Page 488

Source: IEEE Xplore Digital Library