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KMID : 1024519940030010039
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Journal of the Environmental Sciences
1994 Volume.3 No. 1 p.39 ~ p.47
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A Study on the Dispersion of Air Pollutants in Local Circulation of Mesoscale
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Lee Hwa-Woon
Oh Eun-Joo
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Abstract
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Dispersion characteristics of air pollutants in the mountainous coastal area are investigated in considering with the mesoscale local circulations using a two dimensional numerical model with two kinds of topograpy of 500m and 300m. In the model, land-sea breezes and mountain-valley wind are mainly considered under the condition of the absence of large scale prevailing flow in the circulation analysis, and the pollutants dispersion is traced by the Lagrangian methods. According to the results, the wind velocity is affected by topography and is stronger in the case of 500m height mountain than that of 300m, the Pollutants that source is near the coast transported over the mountain and dispersed to behind inland area. It is classified that the topography change control affects the wind velocity and the circulations. The pollutants that source is different transported and concentrated to behind inland and/or diffused to the sea area by the combination of the wind system with topographic changes. The results can be applied to the air pollution control with the arrangement design of industrial area and the planning of coastal developments.
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KEYWORD
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local circulation of mesoscale, dispersion of air pollutants, land-sea breeze, mountain-valley wind, Lagrangain methods
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