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

Samuel Pinson (1) , Julio Cordioli (1) , Laurent Guillon (2)

1 UFSC - Universidade Federal de Santa Catarina = Federal University of Santa Catarina [Florianópolis]
2 IRENAV - Institut de Recherche de l'Ecole Navale

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.

Mots clés: Acoustic rough interface scattering; Acoustic waves; Interface roughness; Speed of sound; Transmission coefficient

Domaines: Acoustique [physics.class-ph]

Samuel Pinson, Julio Cordioli, Laurent Guillon. Spherical wave reflection in layered media with rough interfaces: Three-dimensional modeling. Journal of the Acoustical Society of America, 2016, 140 (2), pp.1108-1115. ⟨10.1121/1.4961000⟩. ⟨hal-01397195⟩