Ground-effect interference fades at higher frequencies and longer ranges
Evidence
A consequence of the inclusion of extended reaction is a considerable reduction in the best-fit effective flow resistivity. … There is some evidence of higher-order interference peaks associated with ground effect up to 2.5 kHz for horizontal ranges at 12 and 48 m for sites 1 and 2. Above this frequency, for these ranges and sites as indicated by Figs. 7 and 8 and above 1 kHz for the 96-m range, the interference peaks and troughs are barely discernible. For site 3, at 40-m range and above 400 Hz, the measured attenuation is much higher than that predicted by ground effect alone. — Margaret A. Price, Keith Attenborough, and Nicholas W. Heap, Sound Attenuation through Trees, 79
Categorization
- XREF: Directly supports the leaf-off hypothesis design for the soundscape polyad: these are the frequencies/ranges where foliage must be doing the work, which is the experimental window where leaf presence vs. absence will show. — connects to: Mature woodland humus layers do not behave as locally reacting acoustic grounds — Margaret A. Price, Keith Attenborough, and Nicholas W. Heap, Sound Attenuation through Trees:…, 52
Related
- Mature woodland humus layers do not behave as locally reacting acoustic grounds (similarity 0.83)
- Ground and vegetation attenuate noise in complementary frequency ranges. (similarity 0.82)
- Margaret A. Price, Keith Attenborough, and Nicholas W. Heap — Sound Attenuation through Trees Measurements and Models (similarity 0.82)
- Ground impedance, not foliage, governs low-band attenuation by vegetation. (similarity 0.81)
- Woodland attenuation shows a characteristic peak-dip-rise spectral shape (similarity 0.81)
- Trunk scatter cannot alone explain forest high-frequency sound attenuation (similarity 0.81)
- Woods sound attenuation stays near constant regardless of optical visibility through the canopy. (similarity 0.80)
- Prior noise studies conflicted after omitting ground attenuation as a variable. (similarity 0.79)
- Leaf width and canopy leaf area drive sound scattering in dense vegetation (similarity 0.79)
- Effective flow resistivity is the dominant ground absorption parameter. (similarity 0.79)
- Excess attenuation increases with frequency in vegetated habitats (similarity 0.79)