Urban forest acoustics by Voichita Bucur

By Voichita Bucur

Trees can decrease noise by means of sound mirrored image and absorption. Investigating noise regulate in city environments, Voichita Bucur's new publication city wooded area Acoustics covers the subsequent topics:

- dendrological features of trees

- elements affecting sound propagation in woodland belts

- apparatus for in situ noise measurements

- acoustical sensors for the size of tree characteristics

- noise attenuation in situ as a result floor and scattering via timber, trunks, foliage, branches

- defense opposed to site visitors noise from highways, railways, aircraft

- family members among city noise and bushes, birds, and insects

- hearth control

- financial points with regards to the worth of city trees.

The booklet is of specific curiosity to these eager about environmental administration, noise regulate, and concrete forestry. it's a useful resource of data for environmental managers, foresters, acousticians, engineers, architects, scientists, and students.

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G. λ = 33 cm for a sound velocity of 330 m/s). The incident acoustic waves are partially reflected and refracted, producing a typical scattering phenomenon, as shown in Fig. 8. The acoustic scattering and attenuation of sound are studied mainly along a line between a source and a receiver. The branches and the foliage partially scatter the incident acoustic energy to the side and backwards, producing a shadow zone behind the vegetation. The canopy of deciduous trees attenuates the incident noise.

7. 75 m, source length 600 m, receiver height 1 m, distance from source axis 100 m, effective flow resistivity (σe ) for the pasture 125,000 N s m−4 , excess attenuation α 0 m−1 ; and, for the pine stand σe 7,500 N s m−4 and α 25 m−1 (Huisman and Attenborough 1991). Reprinted with permission from the Acoustical Society of America, copyright 2005 Results of theoretical and “in situ” studies (Huisman 1990; Huisman and Attenborough 1991) of the effect of forest ground on the A-weighted imission level of road transmission noise, on a typical configuration of a planted pine forest (Fig.

14. The frequency domain response of a single artificial tree from the grove is shown in Fig. 14a. and corresponds to the range 1–18 kHz. The responses of the nine artificial trees from the grove are shown in Fig. 14b, c. Both time and frequency domain signals are very complex, showing a high variability, which can be explained by the multiple returning pulses from different trees and from different zones of individual trees. As far as the experimental data in the anechoic chamber with artificial trees seems to be coherent, it is therefore natural to consider the study of a natural tree belt.

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