西安市十字街口CO浓度变化规律实验研究

Experimental Study on the Law of CO Concentration Change at the Intersection in Xi’an

随着城市机动车数量不断增加,道路拥堵、机动车怠速排放污染物现象更加严重。而十字街口处建筑高大、密集,污染物在此不易扩散,更易危害人体健康。为了解城市十字街口CO浓度变化规律及相关影响因素,本文通过大量网络调研及实地调研,选取西安市典型十字街口,对十字街口处的温度、湿度、风速、CO数据进行采集,并进一步分析,得出车流量、气象因素,以及街口形态与CO浓度的关系及变化规律。另外,选取典型十字街口分析得出不同风向下十字街口处CO浓度纵向分布规律及横向分布规律。

With the continuous increase of the number of motor vehicles in cities, the phenomenon of road congestion and motor vehicle idling emission pollutants is more serious. The buildings at the crossroads are tall and dense, and the pollutants are not easy to spread here, which endangers human health. In order to understand the variation law of CO concentration at the intersection of the city and the related infuencing factors, this paper selects a typical intersection of Xi’an and collects the temperature, humidity, wind speed and CO data at the intersection through a large number of network research and feld investigation. Through further analysis,the relationship between traffic flow and CO concentration, the relationship between meteorological factors and CO concentration,and the change law of street shape and CO concentration were obtained. In addition, the typical intersection is selected to analyze the longitudinal distribution law and horizontal distribution law of CO concentration at the intersection under diferent winds.