Sound attenuation through trees: Measurements and models

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Abstract
Measurements obtained at three British woodlands for the frequency-dependent attenuation of broadband sound with distance under neutral atmospheric conditions are compared with the predictions of a model obtained by summing the separate contributions of the ground, the trunks and branches, and the foliage. The two latter contributions are predicted by an empirically modified multiple scattering approach. The principal features of the measured spectra, viz., the low-frequency peak in excess attenuation below 500 Hz and a gradual increase of attenuation with frequency above 1 kHz, are predicted in a tolerable fashion by the composite model, as are the observed differences in acoustic propagation in the three different woodland areas.

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