SCIPUFF模式的简化及验证

THE SIMPLIFICATION AND TEST OF SCIPUFF MODEL

将SCIPUFF (Second-order Closure Integrated PUFF) 模式中烟团分解和合并的思想予以保留,而对其与二阶矩有关的扩散参数则予以简化。用Briggs公式给出扩散参数。开发出合并与分解的烟团模式(Splitting-Merging Puff),简称SMP模式。通过与SCIPUFF模式结果相比较,SMP模式对计算精度影响不大。与Monte-Carlo方法相比较,两者模拟结果较接近,但计算效率至少可以提高一个数量级。SMP模式在预报的准确性和时效性方面都能满足开展空气质量预报的要求。

The idea of splitting and merging of a puff in SCIPUFF model is reserved in this paper, but with the diffusive equation related with the second moment simplified. The diffusive is determined by Briggs formula. The model of splitting and merging puff is developed and is named SMP. Comparing with the result of SCIPUFF model, it is proved that the simplified model is slightly affected in accuracy. Comparing with the simulative result of Monte-Carlo method, the difference is very small, but the calculating effect can improve about ten times at least. As an accurate and effective atmospheric diffusive model, SMP model is fit to be used in the prediction of atmospheric quality.