As the volume of the road traffic increases, the underground transportation has been focused and developed recently. Especially, the subway is the main transportation system in Seoul as well as in other major cities for public. The environment of subway is not desirable due to its structural characteristics, and it is also exposed to citizens. The examination has been conducted for the air purification system for the management of the subway air quality and Platform Screen Doors(PSDs) installed to prevent pollution by train-induced wind. After installing PSDs, the platform air quality was improved, but the tunnel air quality got worse. Moreover, the aerodynamic effect became bigger when the train runs in the tunnel, but the accurate assessment and analysis are insufficient for the aerodynamic effect. The effect by train-induced wind of the ventilation in the tunnel is significant. So the reasonable and quantitative train-induced wind has to be evaluated and has to be applied to the design stage. This study was aimed to produce useful data for the IAQ(lndoor Air Quality) in subway; especially the train-induced wind has been investigated by means of field surveys and analyses. We carry out the field measurements to quantify the train-induced wind generated by train operation. We found out the quantitative train-induced wind and how the airflow forms by the train arrival and departure. We believe the results from this work will help engineers to understand the airflow in tunnels with PSDs. The recent updates including the quantified characteristics of the train-induced wind will be represented in this paper.
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