| 风速对人为扬尘源PM10排放浓度和强度的影响 |
| 摘要点击 1168 全文点击 1279 投稿时间：2007-10-31 修订日期：2008-01-22 |
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| 中文关键词 未铺装道路 建筑工地 PM10 扬尘 风速 |
| 英文关键词 unpaved road construction site PM10 fugitive dust wind velocity |
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| 中文摘要 |
| 人为扬尘源排放模型很少考虑风速对排放的影响，为了解人为扬尘源排放浓度及排放强度与风速的关系，以施工扬尘和道路扬尘为典型人为扬尘源，通过现场实测研究了风速对扬尘源附近大气环境中扬尘排放浓度、排放强度的影响.结果表明，扬尘源附近大气环境中因扬尘造成的PM10（可吸入颗粒物）排放浓度随风速的增加先降后升，本研究中最低浓度值所对应的2.2 m高度处的风速v(cmin)为1.0～2.0 m/s；扬尘排放强度随风速的增加逐渐升高，风速v(cmin)时，排放强度随风速增加增幅较小，风速超过v(cmin)后，排放强度迅速增大.将人为扬尘分为机械力扬尘和风蚀扬尘，进行了机制探讨，理论结果与现场观测结果是吻合的. |
| 英文摘要 |
| In the emission factor models of man-made fugitive dust, the wind velocity parameter has little been accounted for. PM10 concentration and wind velocity were measured near a unpaved road and in a construction site. PM10 emission flux was calculated using the measured data. The relationship between PM10 concentration and emission flux and wind velocity was studied. The results show that the PM10 concentration is high in the condition of static and slight wind. PM10 concentration descend with the wind velocity increased, and the concentration reaches to the minimum value when the wind velocity reach to 1.0-2.0 m/s, then with the wind velocity increasing (>1.0-2.0 m/s), the PM10 concentration increases quickly. The emission flux increased with the wind velocity increasing, and the speed increasement become more after the wind velocity was faster than 2.0 m/s. The man-made fugitive dust was divided into mechanism operation and wind erosion dust to research the emission mechanism. The results based on theory analysis and the measured data are consistent. |
