摘要
用虚点源模式可以将面源转化为点源来处理,它是一种常用的面源扩散计算模式,其缺点是在靠近污染源的地方计算所得浓度值偏高。针对虚点源模式的这一严重缺陷,文章提出了一个对面源自身网格污染浓度计算的改进方案:采用位于上风方向的一个源强为原来面源源强的1/4的等效面源来代替原来的面源,同时考虑该等效面源相对于原来面源的后退距离,仍然使用虚点源模式进行计算,就可以得到比较准确的污染物浓度场。这一改进措施的实际效果通过计算实例得到了验证。
The virtual point source model, through which an area source is handled as a point source, is widely used in area source dispersion calculation. However, the concentration modeled by this model is always higher than the actual concentration when the concerned point is near the source. Aiming at this vital limitation of the virtual point source model, an improvement is put forward. An equivalent area source whose strength is a quarter of the original one takes the place of the original one, and, the distance between the two equivalent area sources is also considered. The practical effect of this improvement is confirmed by calculating examples.
出处
《环境科学与技术》
CAS
CSCD
北大核心
2009年第1期111-114,共4页
Environmental Science & Technology
基金
国家自然科学基金项目(40675059)
关键词
大气扩散
面源扩散模式
虚点源模式
改进算法
air dispersion
area source dispersion model
virtual point source model
improved algorithm
