Author(s)

C.F. Fang

Abstract

This investigation examined the noise attenuation effect of five hedges, and determined the quantitative criterion of noise attenuation by hedges. The amplifier was placed in front of the hedges, while the noise meter was placed at various heights and distances behind the hedges. Subtracting the sound pressure level at each measurement site on hedges from that on open ground obtains the net reduction effect of hedges, namely, relative attenuation. The parameters included visibility, height and width of hedge, received and noise source height, and the distance between noise source and receiver. The multiple regressive model demonstrated that the order of importance for the factors was tree visibility, width, height, received and noise source height, and distance between noise source and receiver. The five factors wer

Keywords