城市道路交通噪声监测状况与传播特性

Current Monitoring Condition and Dissemination Characteristic of Traffic Noise in Urban Areas

针对目前城市道路交通噪声的影响状况,应用大量的城市道路交通噪声例行监测与实测数据,对城市道路交通噪声的变化规律及传播特性进行了分析研究。城市主要道路交通噪声的变化幅度,有80%以上的昼间在2—3 dB(A),夜间在2—4 dB(A);每天12:00—15:00时段的噪声是昼间比较低的噪声,2:00—4:00时段是夜间噪声比较低的时间段;在一定时期内,Ld与Ln的变化幅度≤1.0 dB(A),Ld-Ln的变化幅度也多在3 dB(A)之内;道路交通噪声的高低及向两侧区域的传播状况与路两侧区域的建筑物坐落方式、外表面的反射等各种环境因素有很大关系。

Aiming at the traffic noise condition in urban area,the variation and propagation of urban traffic noise are analyzed with application of large amount of measurement data.It is found that more than 80% of noise magnitude varies from 2 to 3 dB（A） in the daytime,from 2 to 4 dB（A） at night.The noise from 12：00 to 15：00 is relatively low in the daytime,and the noise from 2：00 to 4：00 is also relatively low in the morning.Within certain period,the Ld and Ln magnitudes are lower than 1.0 dB（A）,the absolute value of ｜Ld Ln｜ varies within 3 dB（A）.The level and dissemination condition of the traffic noise depend upon the position and surface reflection of the buildings and some other environment conditions on both sides of the road.This work provides some references for traffic noise control in the urban areas.