Abstract
The sound field within a layered porous granular medium may be explored by means of suitably protected probe microphones. The field within a system consisting of a granular surface layer above a thick porous substrate with considerably higher flow resistivity is modelled by assuming the granular media to be characterized by uniform slit-pores within a rigid solid matrix and by applying boundary conditions at each interface. The predicted relative amplitude spectrum within the surface layer is influenced by interferences between the first few wave components of the internally reflected field. Predictions are in qualitative agreement with data obtained in washed sand and gravel.
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