城市交通隧道汽车废气排放环境影响的实验研究

利用风洞物理模拟手段，对处于城市街区的交通隧道风井塔和峒口排放污气的环境影响作了实验研究，并基于射流理论和现场实测，建立峒口污染物散布的预测模式，该模式用于模型区环境影响评价，研究表明．１．隧道峒口污气排放有可能造成短时局地比较严重的污染影响，废气浓度可能超标，但影响范围不大，并且与周围建筑物，环境，气温和车辆运行状况等密切相关；２．建筑物的空气动力学效应对污染物扩散有明显影响。

AN EXPERIMENTAL STUDY ON ENVIRONMENTAL IMPACT OF AUTOMOBILE EXHAUST FROM URBAN TRANSPORTATION TUNNELS

By using wind tunnel simulation technique and field survey and based on the jet theory,experiments for modeling the environmental impact of automobile exhaust discharged from the ventilation tower and from the tunnel exits have been carried out.An emerical model for predicting the dispersion of air pollutants has been developed which is suitable for the assessment on environment impact in the model area.The results demonstrated that 1)automobile exhaust emitted from tunnel exits may cause serious air pollution and the concentration of waste gases may be exceeded the permission standard.However,the pollution is limited to a small area and associated to the lay out of the surrounding buildings,air temperature,and the intensity of transportation etc .;2)the aerodynamic effect of surrounding buildings affects significantly to the dispersion of the pollutants;3)the approach of physical modeling has its unique advantage and the results of model calculation and the wind tunnel measuring data can be used for mutual verification.