Horizontal refraction modal tomography of the ocean with mode interactions

Author

Voronovich, Alexander G. ; Shang, E.C.

Author_Institution

Cooperative Inst. for Res. in Environ. Sci., Colorado Univ., Boulder, CO, USA

Volume

24

Issue

2

fYear

1999

fDate

4/1/1999 12:00:00 AM

Firstpage

224

Lastpage

231

Abstract

The acoustical tomography scheme for inferring a three-dimensional sound-speed field within some area based on the measurements of horizontal refraction angles is reviewed. The numerical simulations made so far were based on the assumption of the adiabaticity of low-frequency mode propagation. In this paper, an inversion scheme is presented that accounts for the acoustic mode interaction. We found that, generally, the interaction weakly affects the horizontal refraction angle, and it can be accounted for by iterations. Numerical simulations for the case of an Atlantic “meddy” corresponding to a strong double channel stratification are presented. Only three iterations were required to retrieve the exact strong sound-speed-field inhomogeneity within an area of 500 km×500 km

Keywords

acoustic signal processing; acoustic tomography; acoustic wave refraction; geophysical signal processing; inverse problems; oceanographic regions; oceanographic techniques; remote sensing; underwater acoustic propagation; Atlantic meddy; acoustic mode interaction; acoustical tomography scheme; adiabaticity; horizontal refraction angles; horizontal refraction modal tomography; inversion scheme; iterations; low-frequency mode propagation; ocean sound propagation; remote sensing; strong double channel stratification; strong sound-speed-field inhomogeneity; three-dimensional sound-speed field; Acoustic measurements; Acoustic propagation; Acoustic refraction; Numerical simulation; Oceans; Remote sensing; Sea measurements; Signal generators; Tomography; Wideband;

fLanguage

English

Journal_Title

Oceanic Engineering, IEEE Journal of

Publisher

ieee

ISSN

0364-9059

Type

jour

DOI

10.1109/48.757273

Filename

757273