High-frequency bottom backscattering: Roughness versus sediment volume scattering

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Abstract
High‐frequency bottom acoustic and geoacoustic data from three well‐characterized sites of different bottom composition are compared with scatteringmodels in order to clarify the roles played by interface roughness and sediment volume inhomogeneities. Model fits to backscattering data from two silty sites lead to the conclusion that scattering from volume inhomogeneities was primarily responsible for the observed backscattering. In contrast, measured bottom roughness was sufficient to explain the backscattering seen at a sandy site. Although the sandy site had directional ripples, the model and data agree in their lack of anisotropy.

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