Abstract
Possibilities of scattering data inversion for various seabed properties are analyzed using recently developed models of acoustic bottom interaction. Different scattering mechanisms are considered giving the main contributions to total bottom scattering which are due to different types of medium irregularities: volume inhomogeneities of the sediment medium and roughness of its surface and internal interfaces. High-frequency model of scattering corresponds to sufficiently strong absorption and small penetration into the sediment such that the influence of seabed stratification is negligible. At lower frequencies, a layered seabed scattering model considers also refraction and interference effects due to sediment stratification as well as effects of elastic scattering and reflection from the basement supporting both compressional and shear waves. Frequency-angular dependencies of the scattering strength for both monostatic and bistatic cases are calculated and analyzed for various seabed types. Distinctive features are discussed which can be used as classification clues for determination of various parameters of the seafloor. Additional clues are revealed from an analysis of the spatial correlation function of the scattered field that can be used for distinguishing and/or separating the volume and roughness components of scattering.
Published Version
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