• ISSN 0258-2724
  • CN 51-1277/U
  • EI Compendex
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WANG Mingnian, WANG Xu, YU Li, DENG Tao. Operating Environment and Pollutant Distribution in Xiang’an Undersea Tunnel[J]. Journal of Southwest Jiaotong University, 2020, 55(4): 695-703. doi: 10.3969/j.issn.0258-2724.20180714
Citation: WANG Mingnian, WANG Xu, YU Li, DENG Tao. Operating Environment and Pollutant Distribution in Xiang’an Undersea Tunnel[J]. Journal of Southwest Jiaotong University, 2020, 55(4): 695-703. doi: 10.3969/j.issn.0258-2724.20180714

Operating Environment and Pollutant Distribution in Xiang’an Undersea Tunnel

doi: 10.3969/j.issn.0258-2724.20180714
  • Received Date: 11 Sep 2018
  • Rev Recd Date: 10 Jan 2019
  • Available Online: 03 Mar 2020
  • Publish Date: 01 Aug 2020
  • In order to clarify the distribution of environmental parameters and pollutants in the urban undersea road tunnel, a field test was carried out for the ventilation effect of Xiamen Xiang'an undersea tunnel. The atmosphere pressure, temperature and humidity, air speed, CO, NO2, and PM concentration in the tunnel were tested during the peak and off-peak periods. Combined with the one-dimensional diffusion theory and the Fluent component transport model, the distribution of environmental parameters and pollutants along the traffic volume in the undersea road tunnel was studied. The results show that: (1) during the rush hours, the temperature increases gradually along the direction of traffic flow and reaches to 36℃ at the outlet. The humidity decreases gradually along the direction of traffic flow and reaches to 94% at the inlet. The CO, NO2, and PM concentrations increase gradually with the direction of traffic flow and reach to maximum at the outlet, the maximum concentrations were 21.00 ppm, 3.73 ppm and 1.76 mg/m3, respectively. The PM concentration at the bottom of the V-shaped slope reaches to 2.03 mg/m3. According to the conversion formula of particulate matter concentration and extinction coefficient, the extinction coefficients at the outlet and the bottom of the V-shaped slope are 0.008 3 m−1 and 0.009 5 m−1 , respectively. The NO2 and PM concentrations exceed the threshold value. (2) The maximum concentration of NO2 during off-peak hours is 1.68 ppm, and the extinction coefficients at the outlet and the bottom of the V-shaped slope are 0.006 9 m−1 and 0.007 7 m−1 , respectively. The NO2 concentration at the outlet and the extinction coefficient at the bottom of the slope exceed the threshold value.

     

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