城市绿色道路廊道的宽度

Width of Urban Green Road-side Corridors

降低汽车尾气污染和交通噪声是城市绿色廊道的主要功能之一.由高斯烟流模式可推算出汽车尾气污染物最大浓度值的出现距离,进而确定绿色道路廊道的基本宽度.结果表明:该距离由线源高度、城市气候条件、道路与盛行风向的夹角决定;绿色道路廊道宽度与车行道半宽之和应大于等于该距离,且越宽越好.结合前人研究,从降低交通噪声考虑,绿色道路廊道应尽量靠近道路布置,且越宽越好.

The main function of urban green road-side corridors are to reduce the automobile tail gas pollution and traffic noise. Using Gauss smoke flow model to deduce the distance where the tail gas concentration reaches the most, and then determinates the approximate width of green roadside corridors.The results show that the distance is dicided by origin altitude,urban climate conditions and the angle between the road and the prevailing wind. The sum of green road-side corridors＇ width and the half width of carriage way ought to be equal to or greater than this distance, the wider the green road-side corridor is, the better the effect is. According to the previous research, in order to reducing traffic noises in the maximal degree, green road-side corridors should cling to roads and the wider the green road-side corridor is, the better the effect is.