1,720,986 research outputs found
Influence of meteorological input parameters on urban dispersion modelling for traffic scenario analysis
No full text
Evaluation of Photostationary and Non-Photostationary Operational Models for NOX Pollution in a Street Canyon
Full text linkTo predict pollutant concentration in urban areas, it is crucial to take into account the chemical transfor-mations of reactive pollutants in operational dispersion models. In this work, we derive and discuss two photostationary (with constant or varying transformation rates) and one non-photostationary chemical models for NO - NO2 - O3 pollution in a street canyon. In the analytical derivation, we focus on the chemical and transport time scales to evaluate the applicability of the models in different urban contexts. We then assess their performance in predicting NO2, NO and O3 concentration at three locations within an urban district by comparing the model predictions with measurements acquired in a field campaign. The results are in line with analytical speculations and highlight in which street types non-photostationary models can bring substantial advantages. In courtyards with limited ventilation and without direct emissions, the performance of the photostationary model with meteorology-based transformation rates is satisfactory. On the other hand, the application of a non-photostationary model significantly improves the predictions in urban canyons with direct vehicular emissions. The applicability of the proposed models in operational tools at the city scale is finally discussed
Influence of heat fluxes on the flow and dispersion within a two-dimensional street canyon
No full textA comparison of measurements and CFD simulations for flow field and pollutant dispersion in urban geometries
No full textPollutant dispersion at the neighborhood scale via wind tunnel experiments and CFD simulations
No full text
- …
