【摘要】 监测公路两侧落叶植物和常绿植物林带夏冬季交通噪声衰减频谱,分析植物体内部构造及外部形态特征对交通噪声衰减的影响。结果发现,植物内部结构特征与特定频率段的噪声衰减量形成良好的依赖关系。提出500Hz以下的低频段林带噪声衰减量主要与植物茎的构造及数量有关,500Hz-2kHz频段林带噪声衰减量主要与叶片结构及数量有关,2kHz以上高频段林带噪声衰减量与树高度及外部形态有关。更多还原

【Abstract】 The noise attenuation spectrum of highway traffic noise due to the tree belts in winter and summer was investigated.The trees of the belts were divided into two types which were the deciduous trees and evergreen trees.The influence of the tree belts on the spectral characteristics of traffic noise attenuation were studied due to the difference of internal structure and external morphology of the trees.Good relations were found between the plant tissue structure and the noise attenuations in some frequency range.For the frequencies below 500Hz,the noise attenuations due to tree belt depend on the plant stem structure.For the frequencies from 500Hz to 2kHz,the attenuations depend on the quantities and structure of the leaves.For the frequencies above 2kHz,the attenuations depend on the height and the shape of the tree crowns.更多还原