应用发烟照相法研究冲洪积扇秋季大气扩散规律

对秋季冲洪积扇地形下污染物扩散问题的处理,需要加强扩散参数的研究。本文应用发烟照相法研究垂直扩散参数,对其理论曲线与实验曲线进行了比较,对下风向轴线浓度理论值与实验值进行了讨论,认为冲洪积扇的地形和稳定度状况,比平原有利于污染物的扩散稀释;洪积扇地形下研究大气扩散,1km内需用实测的扩散参数来进行计算污染物的扩散,1km以远引用理论值是可以接受的。

Application of Smoke Photographic Method in Study on Atmospheric Diffusion Characteristics of Alluvial-Deluvial Fan in Autumn

The treatment of pollution diffusion in terrain of alluvial - deluvial fan in autumn should strengthen the study on diffusion parameters. The paper studies the vertical diffusion parameters with the smoke photographic methed, and compares the theoretical curve and experimental curve of the vertical diffusion parameters. Then the theoretical value and the experimental value of down wind axis con- centration are discussed. It is concluded that the terrain and the stability of alluvial - deluvial fan are more beneficial for the diffusion and dilution of pollutants than that of the plain. By analyzing the atmospheric diffusion in terrain of alluvial - deluvial fan, it is indicated that the accurate diffusion parameter is needed to calculate pollutants diffusion within lkm, and it is acceptable with theoretical value beyond 1km.