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DEVELOPMENT AND CONSEQUENCES OF GROUND INVERSIONS IN THE REVITALIZED POSTMONTANE LANDSCAPE OF THE MOST BASIN
Abstract
In the North Bohemian region in the Most Basin, brown coal quarries are gradually completed and subsequently closed at present time. The planned and implemented process of reclamation of the area affected by surface mining of brown coal consists in the creation of artificial lakes and afforestation of their surroundings. The Most Basin has a character of a graben, especially its central part. The area of the basin is closed between the Ore Mountains and the Bohemian Central Mountains. In a relation with this orthography of the landscape, the area of the basin is ventilated imperfectly. Therefore, an air temperature inversion often occurs here, at which a dispersion conditions degrade significantly. In worsened dispersion conditions, contaminants accumulate in the mixing layer. Sources of air pollution emit approximately the same amount of pollutants with some variability year-on-year. The emission of sources is affected only by the seasonality of their operation in the heating, non-heating and transitional seasons. The increasing level of contamination then depends on the duration of the degraded dispersion conditions and the height of the mixing layer, which is related to the height of the air temperature inversion layer, and the height of the source. From the standpoint of the duration of dispersion conditions, three classes can be simply classified. In the case of the first two classes, good or unfavorable dispersion conditions last a whole day or even several days in a row. In the next class, unfavorable dispersion conditions last only part of the day. This condition is characterized by regular daily runs of meteorological conditions and pollution levels. The article evaluates the spatial and temporal relationships between meteorological variables and the level of pollution in the area of water reclamation of the Lezaky surface mine and its surroundings. The assessment of the level of pollution is based on long-term continuous measurements of aerosol particles PM10, which are the most important pollutant in the locality of the Most Basin..
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References3
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