A new approach for roughness representation within urban dispersion models

The effects of green infrastructure on pollutant concentrations are greatly variable, essentially depending the surrounding built-up environment and local meteorological conditions. To simulate presence trees at urban scale, a reliable methodology is Computational Fluid Dynamics (CFD) approach, however it needs high calculation costs. An alternative integral dispersion model given by provided that suitable parameterization for vegetation included. In this work, we have developed demonstrated novel methodology, based aerodynamic parameters, to include effect in an operational model, ADMS-Urban. parameters were derived using morphometric method starting from open data containing information buildings trees. new roughness parameter has produced spatially varying (USVR) was evaluated different scenarios neighborhood scale. numerical outputs simulations compared with observations reference air quality stations collected within ad-hoc intensive field campaign conducted 2017 city Bologna, Italy. results comparison highlight introduction lead great improvements performance both spatial scales study sites considered study. Conversely, inclusion produces significant only when conducting studies resolution densely vegetated areas. • Novel model. Evaluation addition detailed generally improves especially