翔安海底隧道运营环境及污染物分布规律

为了明确城市海底公路隧道内环境参数和污染物的分布规律，针对厦门翔安海底隧道运营通风效果进行了现场测试，获取了交通高峰期和非高峰期两个时段隧道内气压、温湿度、风速、CO、NO₂和PM浓度的分布规律，结合一维扩散理论和Fluent组分输运模型研究了海底公路隧道内环境参数和污染物随交通流的分布规律. 研究结果表明:（1） 交通高峰期时段，温度沿车流方向逐渐升高，出口处达到最高温度36 ℃；湿度沿车流方向逐渐降低，入口处最大湿度为94%；CO、NO₂和PM浓度随车流方向逐渐升高，在出口处达到最大，最大浓度分别为21.00 ppm、3.73 ppm和1.76 mg/m3，V型坡坡底处PM浓度也较高（2.03 mg/m3）；根据烟尘质量浓度与消光系数的转换公式得到出口处和V型坡坡底处的消光系数分别为0.008 3 m?1和0.009 5 m?1，NO₂和PM浓度超过了规范值.（2） 非交通高峰期NO₂最大浓度为1.68 ppm，出口处和V型坡坡底处的消光系数分别为0.006 9 m?1和0.007 7 m?1，出口处NO₂浓度和坡底处消光系数超过了规范值. 

Operating Environment and Pollutant Distribution in Xiang’an Undersea Tunnel

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.