Abstract :
Atmospheric dispersion simulations were performed using the Gaussian Plume analytical dispersion model
(GPM) for quantification of air concentration of gaseous releases from a typical Coastal region having thermal power
plants, refineries, chemical industries in a coastal atmospheric environment. A computer program is generated based
on the model equations, giving the various atmospheric conditions and stability classifications. The concentration of
an air pollutant such as a gaseous release at a given place is a function of a number of variables, including the amount
of the pollutant released at the source (the emission rate), the distance of the receptor from the source, and the
atmospheric conditions. The most important atmospheric conditions are wind speed, wind direction, and the vertical
temperature characteristics of the local atmosphere. In coastal regions, the temperature structure and wind flow are
also influenced by the local sea-land breeze circulations and the ensuing coastal fumigation phenomena. The model
estimates of air concentrations would also depend on the empirical dispersion relationships. The study area selected
is Manali in North Chennai which is a growing industrial and urban area. In the present study the GPM model is
adopted to estimate ambient ground level air concentrations of few pollutants SO2 (Sulphur dioxide) from industrial
sources in the North Chennai Manali area to understand the local air quality pattern. The GPM equation is modified
for coastal fumigation effects to study its impact and to obtain realistic GLC estimates. The simulation results were
verified by comparison with available observations. Further, it has been found that the simulated concentrations
during sea breeze time are slightly more than those in non-sea breeze time due to fumigation effect. The model
slightly overestimated concentrations during the sea breeze time than the observations.Atmospheric dispersion simulations were performed using the Gaussian Plume analytical dispersion model
(GPM) for quantification of air concentration of gaseous releases from a typical Coastal region having thermal power
plants, refineries, chemical industries in a coastal atmospheric environment. A computer program is generated based
on the model equations, giving the various atmospheric conditions and stability classifications. The concentration of
an air pollutant such as a gaseous release at a given place is a function of a number of variables, including the amount
of the pollutant released at the source (the emission rate), the distance of the receptor from the source, and the
atmospheric conditions. The most important atmospheric conditions are wind speed, wind direction, and the vertical
temperature characteristics of the local atmosphere. In coastal regions, the temperature structure and wind flow are
also influenced by the local sea-land breeze circulations and the ensuing coastal fumigation phenomena. The model
estimates of air concentrations would also depend on the empirical dispersion relationships. The study area selected
is Manali in North Chennai which is a growing industrial and urban area. In the present study the GPM model is
adopted to estimate ambient ground level air concentrations of few pollutants SO2 (Sulphur dioxide) from industrial
sources in the North Chennai Manali area to understand the local air quality pattern. The GPM equation is modified
for coastal fumigation effects to study its impact and to obtain realistic GLC estimates. The simulation results were
verified by comparison with available observations. Further, it has been found that the simulated concentrations
during sea breeze time are slightly more than those in non-sea breeze time due to fumigation effect. The model
slightly overestimated concentrations during the sea breeze time than the observations.
Keyword :
Air quality monitoring, Atmospheric Dispersion modelling, Model Performance evaluation, Meteorological data, Observed concentration, Predicted concentration