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Geoacoustic adjoint-based inversion via the parabolic equation
Papadakis, J.S.; Hermand, J.-P.; Flouri, E.T.; Meyer, M. (2008). Geoacoustic adjoint-based inversion via the parabolic equation. J. Acoust. Soc. Am. 123(5): 3511. dx.doi.org/10.1121/1.2934411
In: The Journal of the Acoustical Society of America. American Institute of Physics: New York. ISSN 0001-4966, more
Peer reviewed article  

Available in  Authors 
Document type: Summary

Authors  Top 
  • Papadakis, J.S.
  • Hermand, J.-P., more
  • Flouri, E.T.
  • Meyer, M.

Abstract
    In this paper an analytic method is exhibited for recovering the acoustic parameters of the sub-bottom region in the ocean. The acoustic propagation problem is modeled via the wide angle parabolic equation and the bottom boundary condition used is in the form of a Neumann to Dirichlet or Dirichlet to Neumann map. The sub-bottom region is assumed homogeneous or horizontally stratified with homogeneous layers. The inversion is modeled as an optimal control problem, and the solution is based on the adjoint method. Several cost functions are introduced which make use of the relative amplitude of the observed complex field. The method is applied to several test cases and satisfactory convergence of the inversion scheme is exhibited.

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