THE EFFECT OF SHEAR WAVE ATTENUATION ON ACOUSTIC BOTTOM LOSS RESONANCE IN MARINE SEDIMENTS
作者： Steven J. Hughes , David M. F. Chapman , N. Ross Chapman
DOI: 10.1007/978-94-011-3568-9_50
关键词:
摘要: Acoustic propagation experiments in shallow water over thinly-sedimented bedrock sometimes show high loss, with resonant-like structure, the 10 to 100 Hz band. This can be interpreted aid of plane-wave reflection models that associate bottom loss at certain combinations frequency and grazing angle shear-wave resonances sediment layer. In this paper, seabed is modelled as a thin layer elastic-solid overlying hard rock substrate, plane interfaces boundaries. The are explained by both full wave-theoretical calculations simplified coherent ray model. For model, two simplifying assumptions applied: (1) there no conversion energy between compressional waves shear water-sediment boundary, (2) attenuated so strongly they traverse once up down only. paper investigates effect attenuation on loss. We find resonance frequencies controlled speed thickness, amount sensitive attenuation.
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