The influence of terrain and inversion layer on pollutant transfer over Lanzhou City.
The influence of terrain and inversion layer on pollutant transfer over Lanzhou City.
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发表时间：
2001
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通讯作者：
Z. Qiang
中科院分区：
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作者：
Z. Qiang
本文结合兰州市的地理和气候条件，给出了兰州市谷地的弗若德数范围；根据山谷风爬坡流和回旋流的弗劳德数临界值约为1.0的基本知识，揭示了山丘高度、逆温强度和地面水平风速对弗劳德数和水平传递的影响，以及不同假设山丘高度下弗劳德数随逆温强度和地面水平风速的动态分布特征。同时，给出了污染物和烟囱的临界高度与山高、逆温强度和地面水平风速的关系。此外，通过灵敏度测试，得到了对风转移有重要影响的山高、逆温强度和水平风速的临界值。
In this paper, the range of Froude number of Lanzhou valley is given o ut, combining the geographic and climatic of conditions of Lanzhou City; and acc ording to the basic knowledge that the Froude number critical value of wind clim bing flow and circling flow in valley is about 1.0, the influence of height of h ill、intensity of inversion and ground horizontal wind speed on Froude number an d horizontal transfer, and dynamic distribution characteristics of Froude number with intensity of inversion and ground horizontal wind speed with several assum ed heights of hill are revealed. At the same time, the dependence of the critica l heights of pollutant and chimney on the height of hill、intensity of inversion and ground horizontal wind speed are shown. Besides, through test of sensitivit y, the critical values of height of hill、intensity of inversion and horizontal wind speed, which have important influence on transfer of wind are obtained.