EVALUATION OF TURBULENCE PARAMETRIZATIONS FOR LAGRANGIAN DISPERSION MODELS

The new meteo-dispersive modelling system SMART is under development and preliminary tests have been conducted. The final purpose is to offer the simulation and forecast of the atmospheric pollutant dispersion due to possible accidental releases in any part of the Italian territory at any time, as an operational suite for emergency response covering all the country is not available. Here the focus is on ARAMIS, the boundary-layer and turbulence parametrization module created to interface the non-hydrostatic atmospheric model MOLOCH and the Lagrangian stochastic dispersion model SPRAY into the SMART system. Since the parametrization of turbulence has a key role for dispersion modelling, we assess the turbulence parameterizations implemented in ARAMIS to prepare the fields needed by SPRAY, by evaluating three options for the standard deviations of wind velocity