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Adjoint-based acoustic inversion for the physical characterization of a shallow water environmenta)

Summary: Adjoint-based acoustic inversion for the physical
characterization of a shallow water environmenta)
Jean-Pierre Hermandb
and Matthias Meyerc
Department of Physics and Mathematics, Université libre de Bruxelles, Environmental Hydroacoustics
Laboratory, Avenue Franklin D. Roosevelt, 50 - CP 194/05, B-1050 Brussels, Belgium
and The Royal Netherlands Naval College, P. O. Box 10000, 1780 CA Den Helder, The Netherlands
Mark Aschd
Université de Picardie Jules Verne, LAMFA-CNRS UMR 6140, 33 rue Saint Leu, 80039 Amiens, France
Mohamed Berradae
Laboratoire d'Océanographie et du Climat-Expérimentation et Approches Numériques,
Université Pierre et Marie Curie, 4 Place Jussieu, 75252 Paris, France
Received 7 December 2005; revised 24 March 2006; accepted 26 March 2006
Recently the concept of adjoint modeling has been introduced in shallow water acoustics for solving
inverse problems. Analytical adjoints have been derived for normal modes and for both the standard
parabolic equation and Claerbout's wide-angle approximation WAPE . This paper proposes the
application of a semiautomatic adjoint approach that has been successfully applied in the past for
multidimensional variational data assimilation in meteorological and climate modeling. Starting
from a modular graph representation of the underlying forward model, a programming tool
facilitates the generation and coding of both the tangent linear and the adjoint models. The potential


Source: Asch, Mark - Faculté de Mathématiques et d' Informatique, Université de Picardie Jules Verne


Collections: Mathematics; Computer Technologies and Information Sciences