Spatial distribution of sound field scattered from the rough seafloor interface

The scattering coefficient of rough seafloor interface is calculated using first order perturbation theory. The interface roughness considered here is described by the isotropic power law spectrum for isotropic rough seafloor interface and anisotropic Gaussian spectrum for the rippled seafloor interface. The characteristic of spatial distribution is shown by the scattering coefficient of the scattered field with forward scattering and backward scattering, which depend on the frequency and the grazing angle of the incident wave, and the roughness of the interface. The dependence of spatial distribution of the scattered field on these parameters is analyzed by Bragg scattering of the sinusoidal interface.