Abstract
Closed-form analytic solutions of wave equations are available for a rather limited subset of geoacoustic models of practical interest. Apart from elucidating the challenging underlying physics of wave propagation, the analytic solutions prove to be useful in sediment acoustics when these predict distinct, identifiable features of measured acoustic fields. Theoretical predictions can be used then to identify or constrain the type of sediment stratification, lead to quick, low-parameter inversions, guide application of statistical inversion methods, and help with interpretation of their results. In this paper, application of analytic solutions of forward problems to acoustic remote sensing of marine sediments will be illustrated by results obtained in a few experiments, which involve observations of slow interface waves near the seafloor and/or resonance peaks in either bottom-reflected energy or in the power spectrum of ambient noise. Coupling between shear and compressional waves in the stratified ocean bottom plays a key role in both examples. [Work supported, in part, by ONR.]
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