A source at a wood’s edge creates large boundary effects on forest sound attenuation.

Evidence

One idea influencing the design of the present series of measurements was a desire to study the acoustic performance of trees under conditions approximating those which exist if a planting of trees is used as a barrier. The source and listener then usually lie outside the extent of the trees. To duplicate this would have been too restrictive on the number of existing woods available for study—in view of the desirability of obtaining results at a considerable number of different sites. A compromise was achieved by having the source located in the open at a distance of 5 to 10 ft from the edge of the woods, while the receiver was located among the trees at several distances from the source. Thus the source was backed by open space, not a continuation of the forest; this is an important distinction between the present and previous work. Characteristic and sizeable boundary effects were measured. — T. F. W. Embleton, Sound Propagation in Homogeneous…, 14

Categorization

• XREF: connects to: Branch transverse vibrations are the active oscillators in tree sound absorption. — T. F. W. Embleton, Sound Propagation in Homogeneous…, 2; Forest edges are sonic discontinuities segregating wind noise from animal sounds. — Almo Farina, Soundscape Ecology: Principles,…, 357; A wall’s edge acts as a point source of diffracted sound — Eric J. Heller, Why You Hear What You Hear- An…, 187 (+1 more)

Broader Connections

• A wall’s edge acts as a point source of diffracted sound #corroborates (0.88) — Eric J. Heller, Why You Hear What You Hear- An…, 187
• Forest edges are sonic discontinuities segregating wind noise from animal sounds. #expands (0.82) — Almo Farina, Soundscape Ecology, 357
• Primary rainforest and forest edge habitats show sharply different spectral noise profiles #expands (0.80) — Almo Farina, Soundscape Ecology, 335