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Comparison between Eulerian and Lagrangian semi-analytical models to simulate the pollutant dispersion in the PBL

机译：欧拉和拉格朗日半解析模型在PBL中模拟污染物扩散的比较

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摘要

In this work we display a numerical comparison, under statistical and computational point of view, between semi-analytical Eulerian and Lagrangian dispersion models to simulate the ground-level concentration values of a passive pollutant released from a low height source. The Eulerian approach is based on the solution of the advection-diffusion equation by the Laplace transform technique. The Lagrangian approach is based on solution of the Langevin equation through the Picard's Iterative Method. Turbulence inputs are calculated according to a parameterization capable of generating continuous values in all stability conditions and in all heights of the Planetary Boundary Layer (PBL). Numerical simulations and comparisons show a good agreement between predicted and observed concentrations values. The comparison reveals the main advantages and disadvantages between the models.
机译：在这项工作中，我们从统计和计算的角度显示了半解析的欧拉和拉格朗日色散模型之间的数值比较，以模拟从低高度源释放的被动污染物的地面浓度值。欧拉方法是基于拉普拉斯变换技术对流扩散方程的求解。拉格朗日方法是基于Picard迭代法求解Langevin方程的方法。根据参数化计算湍流输入，该参数化能够在行星边界层（PBL）的所有稳定性条件和所有高度下生成连续值。数值模拟和比较表明，预测浓度值和观察值之间有很好的一致性。比较显示了模型之间的主要优缺点。

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