高速公路绿化林带降噪效果研究

Study on Noise Reduction Effect of Expressway Green Belt

为研究高速公路绿化林带对交通噪声的衰减效果,对长宜高速公路浙江段路侧代表性绿化林带降噪效果进行了定位测量,并探讨了林带类型、宽度、结构等因素对噪声衰减的影响。结果表明:高速公路绿化林带具有良好的降噪效果,不同林带类型其降噪能力差别较大。随着林带宽度的增加,其降噪能力逐渐减弱。为达到有效的降噪效果,建议高速公路绿化带宽度不宜小于10m。绿化林带对交通噪声的衰减效果是包括植物特点和林带结构在内的多种因素共同作用的结果,建议在高速公路绿化带建设时优先选分枝点低、分枝多、枝叶细密的植物。

In order to study the decay effect of highway green belt on traffic noise, the noise reduction effect of repre- sentative greenbelts on the side of Zhejiang section of Changyi Expressway was measured. Besides, the study discussed the effect of typse, width, and community structure of green belts on traffic noise attenuation. The results showed that the disposition of detected green belts had obvious noise reduction effects and the effects differed inthe types of green belts. The ability of noise reduction gradually declines when width increasing. Thus,in order to achieve an effective noise reduction, it suggests that the width of green belt should not be less than 10 m. The effects of traf- fic noise attenuation by green belts are the results of various factors, including the plant characteristics and belt structure.It is suggested thatthe species with low branching points, more branches and dense are preferred in the construc- tion of highway green belt.