Abstract
Through comparisons with numerical predictions, with data from laboratory experiments and with outdoor data obtained over snow, heuristic modifications of the classical analytical approximation for the field due to a point source above an impedance plane are shown to be adequate for predicting sound propagation from a point source close to layered porous media with extended reaction. The main deficiencies are for extremely low flow resistivities and at close ranges. It is shown that multiple layering offers a possible explanation for previously reported difficulties in obtaining theoretical fits to propagation data over snow [J. Acoust. Soc. Am. 77, 67–73 (1985)].
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