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A microscale model for air pollutant dispersion simulation in urban areas: Presentation of the model and performance over a single building |
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| Authors: | Ning Zhang Yunsong Du Shiguang Miao |
| Institution: | 1. Institute for Climate and Global Change Research and School of Atmospheric Sciences, Nanjing University, Nanjing, 210093, China 2. Sichuan Environmental Monitoring Center, Chengdu, 610091, China 3. Institute of Urban Meteorology, China Meteorological Administration, Beijing, 100089, China |
| Abstract: | A microscale air pollutant dispersion model system is developed for emergency response purposes. The model includes a diagnostic wind field model to simulate the wind field and a random-walk air pollutant dispersion model to simulate the pollutant concentration through consideration of the influence of urban buildings. Numerical experiments are designed to evaluate the model's performance, using CEDVAL(Compilation of Experimental Data for Validation of Microscale Dispersion Models) wind tunnel experiment data, including wind fields and air pollutant dispersion around a single building. The results show that the wind model can reproduce the vortexes triggered by urban buildings and the dispersion model simulates the pollutant concentration around buildings well. Typically, the simulation errors come from the determination of the key zones around a building or building cluster. This model has the potential for multiple applications; for example, the prediction of air pollutant dispersion and the evaluation of environmental impacts in emergency situations; urban planning scenarios;and the assessment of microscale air quality in urban areas. |
| Keywords: | numerical model urban air pollution air pollutant dispersion emergency response model |
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