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首页> 外文会议>Fourth International Conference on Air Pollution Monitoring, Simulation and Control, Aug 28-30, 1996, Toulouse, France >Dispersion of a passive pollutant above urban areas in mountainous regions
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Dispersion of a passive pollutant above urban areas in mountainous regions

机译：被动污染物在山区市区上方的扩散

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摘要

Dispersion of a neutral tracer above a urban area in Grenoble (France) is studied with a large eddy simulation (LES) of atmospheric flows under conditions of steady wind. The complex terrain with surrounding mountains is taken into account with a computational domain whose extension is 23Km x 25Km x 15Km. The tracer is emitted from a non-buoyant point source and transported by a quasi steady wind coming from north west direction. The results are compared with data obtained from an experiment with a three hours steady release of SF_6 on June 15th, 1995. A good agreement is observed for tracer dilution when comparing calculated and observed values of CTA (Atmospheric Transfer Coefficient). Results from a dispersion model based on a gaussian formulation are also plotted versus results from the measurements. For these meteorological conditions, the orography of the site is clearly the predominant factor in the dispersion process.
机译：在稳定风条件下，通过大气流动的大涡模拟（LES）研究了法国格勒诺布尔市区上方中性示踪剂的扩散。扩展范围为23Km x 25Km x 15Km的计算域考虑了周围群山的复杂地形。示踪剂是从非浮点源发出的，并由来自西北方向的准稳定风传送。将结果与1995年6月15日稳定释放三小时SF_6的实验获得的数据进行比较。比较CTA（大气传输系数）的计算值和观察值时，示踪剂稀释度观察到很好的一致性。还绘制了基于高斯公式的色散模型的结果与测量结果的关系图。对于这些气象条件，站点的地理位置显然是分散过程中的主要因素。

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