摘要
本文以兰州地区的实际地形为背景,建立了一个二维小尺度数值模式,并用它对山谷之间热力差异造成的山谷风环流及其控制下山谷中高架源排放的污染物输送和扩散过程进行了模拟研究。结果表明,在山谷风环流控制下,造成山谷内高污染浓度的主要因素有两个:一是日出前和日落后山谷风的转换;二是在白天由于山谷风环流所造成的山谷上空较强的下沉气流。
In this paper, a two-dimensional numerical micro-scale model is given in the background of real terrains of Lanzhou city. The mountain-valley wind caused by heating difference, and the process of air pollutants transportation and dispersion from elevated source are simulated using this model. It shows that there are two factors to bring about serious air pollution, one is a transition of the mountain-valley wind around sunrise and sunset, the other is the strong downdraft caused by mountain-valley circulation over the valley at daytime.
出处
《高原气象》
CSCD
北大核心
1991年第4期362-370,共9页
Plateau Meteorology
基金
国家自然科学基金资助项目
关键词
风
环流
大气
污染物
输送
模拟
Mountain-valley wind
Air pollution
Two-dimensional numerical model.
