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KMID : 1024520100190030281
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Journal of the Environmental Sciences
2010 Volume.19 No. 3 p.281 ~ p.293
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Effect of Difference of Land Cover Conditions on Urban Thermal Environment in Daegu Using Satellite and AWS Data
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An Ji-Sook
Kim Hae-Dong
Kim Sang-Woo
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Abstract
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The present study explores time and spatial thermal environment for Daegu, which is a city built on a basin area, according to varying land cover conditions of the earth’s surface by analyzing data derived from meteorological observation and satellite images. The study has classified land use by utilizing MODIS satellite images and analyzed land surface temperature. Also, by using data acquired from automatic weather system, the study has evaluated the effects of atmospheric heating caused by city pavements by analyzing the sensible heat flux between the city’s land surface and the atmosphere.The results are as follows. 1) Classification of land use in the Daegu area shows 46.64% of urban and built-up area, 1.39% of watersides, 35.19% of forest, 11.43% of crops, and 5.37% grasslands. 2) During the weekdays throughout the year, the land surface temperature was high for Dalseogu, Bukgu, and Seogu regions where industrial complexes could be found. Comparatively, lower temperature could be observed in the woodlands. 3) While the land surface temperature displayed the effects of pushing air upwards during the weekdays in urban areas, the reverse was true for forest regions. During the night, the temperature did not exert any significant influence on air movement.
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KEYWORD
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Thermal pollution, MODIS, Sensible heat flux, Land surface temperature
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