大气边界层内羽流扩散研究

主要研究了高架点源的污染，即``羽流扩散'. 由于大气边界层内的湍流运动，引 起污染物扩散的主要因素是湍流扩散， 研究湍流扩散有两种基本方法：统计理论和梯度理论. 采用拉格朗日粒子扩散模型 (Lagrangian particle dispersion model, LPDM)来评价羽流扩散的平均浓度，分别计算了表征扩散程度的3个参数：沿烟轴方向的 着地浓度、水平方向的羽流扩散宽度和垂直方向的羽流扩散宽度. 从计算结果和风洞实验的 数据对比来看，用该模式可以较好地模拟大气边界层内复杂气候条件下的羽流扩散.

The research of plume dispersion in the atmosphere boundary layer

As the development of industry, atmosphere pollution is becoming a more important problem. This paper is written mainly for studying the plume dispersion. Because the atmosphere movement is turbulence, the mechanism of dispersion is turbulent dispersion. There are two methods to study turbulent dispersion. One is statistic theory, and the other is gradient theory. We use Lagrangian particle dispersion model (LPDM) to study plume dispersion. We calculate three factors which indicate the plume. Those are concentration on the ground along plume axis, horizontal plume width and perpendicular plume width. From the compare of calculation result with experiment data, the numerical method can simulate plume dispersion under complex climate condiction very well.