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Spherical wave reflection in layered media with rough interfaces: Three-dimensional modeling

Article dans une revue avec comité de lecture
Author
PINSON, Samuel
119004 Universidade Federal de Santa Catarina = Federal University of Santa Catarina [Florianópolis] [UFSC]
CORDIOLI, Julio
119004 Universidade Federal de Santa Catarina = Federal University of Santa Catarina [Florianópolis] [UFSC]
GUILLON, Laurent
13094 Institut de Recherche de l'Ecole Navale [IRENAV]

URI
http://hdl.handle.net/10985/11332
DOI
10.1121/1.4961000
Date
2016
Journal
Journal of the Acoustical Society of America

Abstract

In the context of sediment characterization, layer interface roughnesses may be responsible for sound-speed profile measurement uncertainties. To study the roughness influence, a three-dimensional (3D) modeling of a layered seafloor with rough interfaces is necessary. Although roughness scattering has an abundant literature, 3D modeling of spherical wave reflection on rough interfaces is generally limited to a single interface (using Kirchhoff-Helmholtz integral) or computationally expensive techniques (finite difference or finite element method). In this work, it is demonstrated that the wave reflection over a layered medium with irregular interfaces can be modeled as a sum of integrals over each interface. The main approximations of the method are the tangent-plane approximation, the Born approximation (multiple reflection between interfaces are neglected) and flat-interface approximation for the transmitted waves into the sediment. The integration over layer interfaces results in a method with reasonable computation cost.

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