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为了克服林带声衰减量计算过于简化而引起的公路交通噪声预测精度降低的不足,基于植物内部结构及吸声、散射机理的分析,建立了高速公路林带声衰减量计算公式,公式中包含了林带宽度、密度、平均灌幅、高度和林带近路侧距公路中心线距离等特征参数。将该公式应用于公路交通噪声预测模式中,分别与16处阔叶林带、11处针叶林带后监测点夏秋季、冬季噪声实测值进行比较。结果表明:模型预测值与实测值具有良好的一致性,预测误差小于(-0.6±1.7)dB,从而证明了运用该公式计算林带声衰减量的准确性。
In order to overcome the insufficiency of the forecasting accuracy of highway traffic noise caused by too simplistic calculation of the attenuation of the sound attenuation in the forest belt, based on the analysis of the internal structure of the plant and the mechanism of sound absorption and scattering, the formula for calculating attenuation of forest belt sound in expressway is established. Belt width, density, average filling width, height and the distance between the side of the road and the highway center line. The formula was applied to the road traffic noise prediction model and compared with the measured values of summer and autumn and winter in 16 broadleaved forest belts and 11 coniferous forest belts respectively. The results show that the predictive value of the model is in good agreement with the measured value, and the prediction error is less than (-0.6 ± 1.7) dB, which proves the accuracy of using this formula to calculate the attenuation of forest belt sound.