earticle

영어

Rapid urban development has increased urban air temperatures, due to air contaminants and artificial heat sources; these high urban temperatures have resulted in a phenomenon called urban heat island effect (UHI). UHI occurs when agricultural areas and vegetation zones are replaced with impermeable pavement areas made of concrete and asphalt. Such changes increase the amount of heat energy on urban surfaces because the narrow spaces between buildings cannot efficiently release this heat into the atmosphere. UHI is exacerbated by the decrease in evapotranspiration and increase in spaces that absorb solar energy that commonly accompanies urban cores. This excessive heat energy also negatively influences processes in the ecological cycle, causing climatic issues throughout the city, such as a general increase in air temperature and the generation of unexpected wind flows. Urban forests play a major role in the reduction of urban temperature. Spatial patterns of urban forests depend on type, size and shape. The cooling effects of urban forests patterns vary according to contributing degree of vegetation indicators referring to measuring quantitative value of vegetation. With a focus on urban forests, correlation analysis between urban forests area and LST was conducted. Comparing using 214 aerial photographs and Landsat 8 data was performed. In the result, the larger area of urban forests increase the lower urban temperature decreases. Therefore, the large urban forests can be a good strategy to reduce the urban temperature.