A Simple Model of Pollutant Concentrations in a Street Canyon

被引:0
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作者
A. A. Hassan
J. M. Crowther
机构
[1] Glasgow Caledonian University,Department of Physical Sciences
[2] Glasgow,undefined
关键词
Traffic Flow; Pollutant Concentration; Street Canyon; Mass Balance Equation; Traffic Density;
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学科分类号
摘要
A single compartment model has been constructed for predicting hourly concentrations of pollutant concentrations arising from vehicular emissions within a typical street canyon. The model takes account of traffic densities and composition to estimate pollutant emissions within the model compartment. Meteorological data on wind speed and direction are used to define the exchanges of pollutants between the compartment and the surrounding air. A parameter is also included to describe the exchange in calm conditions. The pollutant concentrations are then estimated from a steady state mass balance equation for the compartment, assuming conservation of pollutants. The model was applied to the prediction of carbon monoxide concentrations in Hope Street, Glasgow. Model parameters were fitted using field measurements, together with concurrent meteorological data and traffic flows estimated from traffic census data for Hope Street. The model accounted well for the observed variations in carbon monoxide. It was found that the model parameters varied seasonally, perhaps due to differences in atmospheric stability which have not so far been included in the model formulation.
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页码:269 / 280
页数:11
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