In order to overcome the shortage of reduction for highway traffic noise prediction accuracy due to simplified calculation on noise attenuation of tree belt, a noise attenuation formula of tree belts at the expressway was built based on analysis of plant inner structure and acoustic absorption and scattering mechanism. The characteristic parameters of tree belt, such as tree belt width, density, average canopy density, height, and distance from the source to the tree belts were included in the formula. The formula was applied to highway traffic noise prediction model. For comparison purposes, the field measurements of 16 broad-leaved tree belts and 11 coniferous tree belts were carried out in the summer, the autumn and the winter. The result shows that the model prediction values agree very well with the measured values. The prediction errors are smaller than (-0.6±1.7) dB between noise prediction values and measured values. The agreement shows that the present expression is valid for the noise attenuation calculation of tree belts.
Key words
traffic engineering /
tree belt at expressway /
principle of acoustics propagation /
noise attenuation /
characteristic parameter /
error analysis
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