Function: Acoustic absorption

Noise mitigation by vegetation occurs through absorption, scattering and reflection. The most important sound absorbing element in trees are the leaves. Density of vegetation is important in sound mitigation. While deciduous trees have larger leaf surface they are bare six moths or more a year in Finland. Conifers have a smaller leaf surface but they are evergreen.

Sufficiently wide, dense and high vegetation is effective at attenuating high frequency noise (above 4 Hz) but it has little impact on mitigating low frequency noise (below 100 Hz). It has been studied that the width of the vegetation must be at least 1.5 m in order to attenuate noise at least 5 dB.

 

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