一个解析的面源浓度计算公式

利用级数展开的方法得到一个实用的解析面源公式，它不仅包括了显式源高项，还能计算面源烟羽横风向非轴线浓度，其精度远远高于其它有关模式。此外，利用该公式，研究了面源烟羽的半宽度，并证明，难以用一个固定的后退点源来描述整个面源烟羽，提出可用一移动点源来代替。

AN ANALYTICAL FORMULA OF AREA SOURCE

Using series expansion of dispersion parameters and integrating the plume over a rectangular area source,we have obtained an analytical area source formula, which includes not only source height,but also the component with respect to the lateral direction.The accuracy of the formula depends on the downwind distance from the source and is much higher than that of other area source models. As an example of application of the formula,the width of plume of an area source is researched, which shows that it is difficult to describe the whole plume of area source with a fixed virtual point source;and thus,a moving virtual point source model is suggested.