Virtual source approach to scattering from partially buried elastic targets

A hybrid modeling framework for scattering from general 3D elastic targets in a stratified ocean waveguide is presented, incorporating multiple scattering between the target and the stratification, and allowing for targets to be completely or partially buried in a stratified seabed. The approach uses a generalized wavefield superposition, or virtual source approach, together with a Fourier-Bessel spectral representation of the Green’s function in a stratified ocean,to model scattering from targets described solely by their arbitrary surface geometry and dynamic stiffness. The hybrid approach is here implemented within the OASES-3D modeling framework, with the target surface stiffness determined either analytically, or numerically using Finite Elements.