基于烟羽模型的城市干道交通影响区范围计算

为界定对城市干道交通运行产生影响的道路空间分布,定义城市干道交通影响区,分析烟羽模型的宏观交通参数扩散适用性,进而通过研究区域内路段单元设置,将烟羽模型用于研究路段单元宏观交通参数的路网扩散性,在此基础上,提出路段单元空间平均车速与交通强度的影响距离模型,从而得出基于烟羽模型的干道交通影响区范围,最后以某市主干道杨桥路为例进行试算.试算结果表明,周边26个路段单元的交通影响距离均延伸至杨桥路,其中14个路段单元构成杨桥路交通影响区范围边界.可见该计算方法可求出影响干道交通的路网范围,有利于干道交通生成规律与管理技术研究.

Range Calculation for Urban Arterial Traffic Impact Area Based on the Plume Model

To define the road space distribution which influences urban arterial traffic, the urban arterial traffic impact area was defined. The plume model adaptability for macro-traffic parameter diffusion was analyzed. Further, by dividing the street section in the research area, the plume model was applied for studying the network diffusion of street section macro-traffic parameters. Then on the basis of above, impact distance models of the arterial adjacent street section space average speed and traffic intensity were proposed, so that the arterial traffic impact area range based on the modified plume model was calculated. Finally, as a major arterial, Yangqiao Road in one city was taken as an example for trial calculation. Calculation result indicates that Yangqiao Road is located in traffic impact distances of its adjacent 26 street sections, in which 14 sections compose the Yangqiao Road traffic impact area boundary. It could be seen that, the calculation method could be used to obtain the network range which impacts the arterial traffic, which is beneficial to the research on arterial traffic generation law and management technology.