Publication: Mode and wavenumber inversion in shallow water using an adjoint method
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Mode and wavenumber inversion in shallow water using an adjoint method

- Article in a journal -
 

Area
Geophysics

Author(s)
I. Charpentier , P. Roux

Published in
Journal of Computational Acoustics

Year
2004

Abstract
Modes and wavenumbers are the principal ingredients that characterize the pressure field in an oceanic waveguide. However, wavenumber and mode inversions are well-known to be a difficult task in underwater acoustics. Moreover, this double inversion has never been performed simultaneously from the same configuration of emitters and receivers. We present a new approach to this problem in a shallow water environment between two vertical arrays of sources and receivers. Starting from a classical modal decomposition of the pressure field, our algorithm focuses on a specific treatment of phase and amplitude variables. The key idea is to run a three-stage optimization by working separately on the phase and amplitude of the acoustic field. The high number of variables of the problem is turned into an advantage by using an adjoint code generated by an Automatic Differentiation software. Numerical results in the presence of noise show that modes and wavenumbers are estimated with a high accuracy.

AD Tools
Odyssee

AD Theory and Techniques
Adjoint

BibTeX
@ARTICLE{
         Charpentier2004Maw,
       doi = "10.1142/S0218396X04002390",
       ad_area = "Geophysics",
       ad_tools = "Odyssee",
       ad_theotech = "Adjoint",
       author = "Charpentier, I. and Roux, P.",
       title = "Mode and wavenumber inversion in shallow water using an adjoint method",
       journal = "Journal of Computational Acoustics",
       year = "2004",
       volume = "12",
       number = "4",
       pages = "521--542",
       month = "dec",
       abstract = "Modes and wavenumbers are the principal ingredients that characterize the pressure
         field in an oceanic waveguide. However, wavenumber and mode inversions are well-known to be a
         difficult task in underwater acoustics. Moreover, this double inversion has never been performed
         simultaneously from the same configuration of emitters and receivers. We present a new approach to
         this problem in a shallow water environment between two vertical arrays of sources and receivers.
         Starting from a classical modal decomposition of the pressure field, our algorithm focuses on a
         specific treatment of phase and amplitude variables. The key idea is to run a three-stage
         optimization by working separately on the phase and amplitude of the acoustic field. The high number
         of variables of the problem is turned into an advantage by using an adjoint code generated by an
         Automatic Differentiation software. Numerical results in the presence of noise show that modes and
         wavenumbers are estimated with a high accuracy.",
       issn = "0218-396X",
       id = "Charpentier2004Maw"
}


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