摘要
结合兰州市地理和气候环境,给出了兰州山谷Froude数的范围.并根据气流到达山体时 爬升或侧绕的临界Froude数大约为1的基本认识,揭示了山体高度、逆温层强度和地面水平风 速对Froude数和水平输送的影响以及在几个假定的山体高度下Froude数随逆温强度和地面水 平风速的动态分布特征.同时,说明了污染物临界高度和烟囱临界高度对山体高度、逆温层强 度和地面水平风速的依赖关系.通过敏感性试验,发现了对气流输送有重要影响的逆温强度和 山体高度及水平风速的关键值.
In this paper, the range of Froude number of Lanzhou valley is given out, combining the geographic and climatic of conditions of Lanzhou City; and according to the basic knowledge that the Froude number critical value of wind climbing flow and circling flow in valley is about 1.0, the influence of height of hill, intensity of inversion and ground horizontal wind speed on Froude number and horizontal transfer, and dynamic distribution characteristics of Froude number with intensity of inversion and ground horizontal wind speed with several assumed heights of hill are revealed. At the same time, the dependence of the critical heights of pollutant and chimney on the height of hill intensity of inversion and ground horizontal wind speed are shown. Besides, through test of sensitivity, the critical values of height of hill intensity of inversion and horizontal wind speed, which have important influence on transfer of wind are obtained.
出处
《中国环境科学》
EI
CAS
CSSCI
CSCD
北大核心
2001年第3期230-234,共5页
China Environmental Science
基金
甘肃省-中国科学院科技合作项目
国家重点基础研究发展规划项目
中国科学院知识创新领域前沿项目(210039)
