Lagrangian particle model simulation of tracer dispersion in stable low condition.

The simulation of the dispersion in low wind speed conditions (LW) is a particularly difficult task since even when the atmospheric stability reduces the vertical dispersion, meandering disperses the plume over rather wide angular sectors. Thus, the resulting ground-level concentration is generally much lower than that predicted by standard Gaussian plume models. In this work, we show the preliminary results obtained with these new coupled Langevin equations for the simulation of two LW tracer experiments: the INEL low-wind tracer experiments and the Graz tracer experiments.