夏季国槐林带降噪模型初探

发布时间：2018-10-08 16:35

【摘要】：伴随城市交通的快速发展,交通噪声给人们带来了巨大的困扰,越来越多的学者开展了对交通噪声的降噪研究。在一处国槐绿化带进行了噪声衰减实验,探究国槐绿化带的降噪特性和降噪模型,实验结果表明： (1)八家国槐实验林总体对500Hz、2000Hz、4000Hz噪声削减效果好,对1000H、125Hz、8000Hz衰减效果差。2.5m以下部分对500Hz噪声衰减量最大,；3m以上部分对中高频的2000Hz和4000Hz噪声衰减效果最佳。 (2)声波在林内距声源17m-21m范围内没有发生紊乱的反射、干涉、折射等现象,认为声波随距离增加近似稳定、有序地衰减。 (3)得到了国槐绿化带距声源17m范围外的空间降噪模型。本研究所得模型可以为路旁绿化带设计时提供植被带降噪值的参考,根据声源声级、防护对象的噪声限值可计算出所需配置的国槐林带宽度。
[Abstract]:With the rapid development of urban traffic, traffic noise has brought people a great deal of trouble. More and more scholars have carried out research on the noise reduction of traffic noise. The noise attenuation experiment was carried out in a green belt of Sophora japonica, and the characteristics and model of noise reduction in green belt of Sophora japonica were studied. The results showed that: (1) eight experimental forests of Sophora japonica had good effect on noise reduction of 500Hz / 2000Hz0 / 4000Hz. It is the best for the attenuation of 2000Hz and 4000Hz noise in the middle and high frequency of 2000Hz and 4000Hz in the part below 1000H 125Hz. The attenuation effect of the noise below 2.5 m is the highest in the part above 3 m and the maximum attenuation amount of the noise in 500Hz is less than 3 m. (2) there are no abnormal phenomena such as reflection, interference and refraction in the 17m-21m range of distance sound source in the forest. It is considered that the sound wave is approximately stable and attenuates in order with the increase of distance. (3) the spatial noise reduction model of Sophora japonica is obtained in the range of 17 m from the green band of Sophora japonica. The model can be used as a reference for the noise reduction of vegetation belt in the design of roadside green belt. According to the sound level of the sound source, the noise limit value of the protected object can be calculated for the width of the forest belt of the national Sophora japonica forest that needs to be configured.
【学位授予单位】：北京林业大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TB53;X173

【参考文献】