On the basis of single-vehicle noise emission model, considering the noise attenuation of distance and sound barriers,the computation model of elevated road traffic noise was developed to simulate the traffic noise distribution of Guangzhou Inner Ring Road. The noise distribution was rendering in map based on the geographical information system (GIS). The denoising effects of three noise control measures (speed limit,traffic control and sound barrier construction) were evaluated with East Huanshi Road as example. Results showed that the noise pollution in inner ring road was serious in daytime; the noise exposure of building close to road was 65-70 dB,and the window position of these buildings bearing the noise of 70-75 dB. The noise pollution was serious in East Huanshi Road,railway station section,Chungshan First Road,South Bank Road,West Huanshi Road,these place were the high noise complaints areas. The noise pollution in these area was drop down a level at night,it conformed the limit value (55 dB) of environmental noise standard for urban area (GB 3096-93). Sound barrier construction was a perfect noise control measures for it could reduce the traffic noise without impacting road and vehicle running conditions.%基于单车辆噪声排放模型,考虑距离衰减及声屏障的遮挡作用,建立了高架道路交通噪声模拟模型,计算了广州市内环路的交通噪声分布,并基于地理信息系统(GIS)绘制了内环路的交通噪声地图.同时,以环市东路路段为例,评估了限速、限行及加装声屏障等降噪措施的降噪效果.结果表明:(1)内环路昼间的噪声污染较严重,靠近道路的第1排建筑物大部分处于65～70 dB的噪声环境之下,面对路面的建筑物的开窗位置,噪声达到70～75 dB.噪声较严重的地区为环市东路路段、火车站路段、中山一路路段、南岸路路段、环市西路路段等,这些地区都可能成为内环路噪声投诉事件的高发地区.相同地区的噪声在夜间下降了一个级别,能够达到《城市区域环境噪声标准》(GB3096-93)的限值要求(55 dB).(2)加装声屏障的措施,能够在不影响现有路面行车状态的情况下达到降噪要求,是比较推崇的方法.
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