Diurnal Variation of the Dust Concentration in a Railway Tunnel

Title & Authors
Diurnal Variation of the Dust Concentration in a Railway Tunnel
Woo, Sang Hee; Kim, Jong Bum; Hwang, Moon Se; Tahk, Gil-Hyun; Yoon, Hwa Hyeon; Yook, Se-Jin; Bae, Gwi-Nam;

Abstract
In railway tunnels, dust is generated when trains run due to the contact between the wheels and the rails. The generated dust is suspended due to the train-induced airflow, with some of it deposited due to gravitational sedimentation. In this study, the diurnal variation of the dust concentration was investigated in a railway tunnel. A single lane of a tunnel was selected in which to observe more easily the dust concentration due to the passing of a train. Four particle-measuring instruments were utilized to detect dust ranging from 5nm to $\small{20{\mu}m}$. To synchronize the train passing time at the measuring location, a three-dimensional ultrasonic anemometer and a video camera were used. It was found that the dust concentration was significantly increased from $\small{50{\mu}g/m^3}$ to $\small{150{\mu}}$$\small{g/m^3}$ due to the train. Particularly, the dust concentration was greatly increased to more than $\small{250{\mu}g/m^3}$ during the morning rush-hour times.
Keywords
Dust;Railway;Rush hours;Tunnel;
Language
Korean
Cited by
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