Sensitivity analysis of microscale pollutant dispersion large-eddy simulations towards observation network design
Résumé
We present a detailed study of the influence of the atmospheric boundary-layer variability on large-eddy simulation (LES) model predictions in the context of microscale pollutant dispersion in urban-like environments. For this purpose, we have developed a new approach to model inflow boundary conditions and their related uncertainties that are essential to represent how the large atmospheric scales influence the microscale flow features in a complex urban geometry. In a preliminary step, we have considered uncertainties in the inflow mean wind direction and in the friction velocity of the mean wind velocity logarithmic profile. We have then built a perturbed-physics ensemble of tracer concentration fields by integration of the LES model in a multi-query framework. In this study, the ensemble of LES fields is obtained for the Mock Urban Setting Test (MUST) field-scale experiment and it is used to carry out a global sensitivity analysis, i.e. to quantify the LES model spatial dependencies to the mean wind direction and the friction velocity.
Domaines
ClimatologieOrigine | Fichiers produits par l'(les) auteur(s) |
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