摘要
植物对交通噪声具有一定的阻挡与衰减作用,叶片对声波的反射和吸收、降噪的效果取决于绿化植物的种类和纵深密度等。选取西湖周边不同路段典型代表的绿化植被带,通过实地测量、噪声理论计算以及计算机仿真模拟三者进行对比分析,研究绿化植被对交通噪声的阻隔作用及其影响要素。结果表明,绿化带吸声系数取值为0.15时的理论计算结果与软件模拟值十分接近;无灌木的绿化带降噪实测值低于软件模拟值2dB以上;绿化带遮蔽率与其吸声系数变化走势基本一致。研究结果可以给城市景观绿化设计提供参考,以获得较好的降噪效果。
A plant is a barrier to attenuate traffic noise, mainly through reflection and absorption of sound by its leaf, but the effect of noise reduction depends on the species and density of green plants. Different sections of a typical vegetation zone near West Lake were selected to compare the results of actual measurement with traffic noise calculation and computer simulation in an attempt to understand the role of green belt separation in the reduction of traffic noise. The results showed that the values of theoretical calculation were close to the software simulation when the sound absorption coefficient of the green belt was defined as 0.15. The measured values in the areas without shrub were lower than the simulation value by over 2dB. A similar trend was observed between the cover rate of the green belt and its absorption coefficient on traffic noise. The research results provided references for city landscape designers to achieve a good result for noise reduction
出处
《城市环境与城市生态》
CAS
2013年第5期33-36,共4页
Urban Environment & Urban Ecology
基金
国家自然科学基金项目(51078325)
关键词
交通噪声
植物配置
降噪
traffic noise
plant type
noise reduction
