摘要
基于交通量预测数据和车辆单车排放因子,定量估算了音江公路运营近期、中期和远期的车辆尾气所排放的NOx和CO量,并分析了上述污染物在公路两侧的浓度扩散过程。音江公路运营近期每天的CO和NOx排放量分别为6.486t和2.187t,中期排放量为9.881t和3.33t,远期排放量为14.053t和4.736t。在D类大气稳定度和最不利风向条件下,距离公路中心线20m处的近期、中期和远期CO浓度分别为0.053 9mg/m3、0.082 1mg/m3和0.116 8mg/m3,NOx浓度分别为0.018 2mg/m3、0.027 7mg/m3和0.039 3mg/m3,随着距离的增大,污染物浓度逐渐降低,50m处的污染物浓度不到20m处的80%,100m处的污染物浓度降至20m处的47%左右,200m处的污染物浓度仅有20m处的26%。与沿线背景浓度叠加后,音江公路线路两侧的近期、中期和远期NOx日均总浓度均低于国家环境空气质量标准中的浓度限值,表明公路运营期间车辆排放的大气污染物对沿线环境空气质量影响很小。
In this paper, based on the traffic volume forecast data and vehicular emission factors, the emission amount of CO and NOx from vehicle exhaust and the pollutant diffusion concentration in the Yin- Jiang Highway during recent, middle and future period are quantitatively analyzed. The results show that the emission amount of CO and NOx are 6. 486 t and 2. 187 t, 9. 881 t and 3.33 t, 14. 053 t and 4. 736 t in recent, middle, future period, respectively. Under atmospheric stability of D classification and the most unfavor- able wind direction, the CO concentration in 20 m distance from highway centerline are 0. 053 9 mg/m3 , 0. 082 1 mg/ma and 0. 116 8 mg/m3 in recent, middle and future period, respectively. The NOx concentra- tion in 20 m distance from highway centerline are 0. 018 2 mg/m3 , 0. 027 7 mg/m3 and 0. 039 3 mg/m3 in recent, middle and future period, respectively. The pollutant concentration decreased when the distance from the highway increased. The pollutant concentration in 50 m distance from highway centerline is less than 80% of that in 20 m distance, for 100 m distance the concentration is only 470//oo of that in 20 m distance, and for 200 m distance the concentration is only 26% of that in 20 m distance. The total NOx concentration value at both sides of Yin-Jiang Highway is less than the permission value of ambient air quality standard of China, and this indicated that the air pollutant from vehicle exhaust affected weakly the air quality in both sides of Yin-Jiang Highway.
出处
《公路》
北大核心
2012年第11期109-112,共4页
Highway
