Improvement assessment of the OSPM model performance by considering the secondary road dust emissions

摘要

The paper presents the impact assessment of the secondary dust emission from roads included in the calculations of the OSPM (Operational Street Pollution Model) model to improve the quality of the particulate matter dispersion modelling. The research was conducted on the example of the street canyon of Krasinski avenue located in the centre of Krakow for the non-heating period (1.05-31.08.2012). The calculations of the solid particle concentrations were carried out excluding the secondary emissions, with the secondary dust emissions from roads and with the consideration of the street cleaning influence. Evaluation of the model prognostic accuracy was performed using parameters commonly applied in the statistical validation of the air pollutants dispersion models. Actual data concerning the PM10 and PM2.5 concentrations in the air which were used for the assessment of the model performance were derived from the air quality measurement stations located within the examined street canyon. Conducted research proved, that the consideration of the secondary dust emissions for the silt loading values sL = 0.015 g m(-2) results in the increased effectiveness of the OSPM model for the PM10 and PM2.5 concentrations, especially from 10:00 to 24:00. The emission rate adjustment method proposed in the study with the street cleaning induced dust resuspension effect taken into account, contributed to better results of the OSPM calculations during the night and morning hours.