| Summary: | 碩士 === 國立屏東科技大學 === 森林系所 === 96 === Due to rapid development of urbanization, urban heat island effects (UHIE) had become serious problems in Taiwan’s urban environment, and it influence the ecological change of city indirectly. During the summer, the elevated urban temperatures result in increased electricity usage and higher hot pollution levels, it was not only increased the consumption of the energy, but also made the whole urban environment produce the serious urban heat island effect. The least-clouded day and night of MODIS satellite images were used in this study that were acquired between 2003 to 2005, it were selected to generate land surface temperature maps by using MODIS satellite images thermal band, and to analyze the urban heat island effects of the three metropolitan cites in Taiwan. Spatial patterns of urban heat island for each city were examined over its diurnal cycle and seasonal variations. In order to analyze the relationship between UHI and land use, this study attempted to explore the relationship between temperature and several indices, those indices included Normalized Difference Vegetation Index(NDVI), Normalized Difference Water Index (NDWI) and Normalized Difference Build-up Index (NDBI). It was found that the correlations between NDVI, NDWI and temperature are negative, but positive correlation was shown between NDBI and temperature. In UHI intensity, the average maximum UHI intensity appears in Spring (4.23℃) and Winter (3.71℃), is indeed higher than that in Summer (2.83℃) and Autumn (3.29℃), and at day time (4.67℃) is higher than at night time (2.35℃). Both the qualitative and quantitative analysis results showed that the land use would influence urban temperature. Therefore, with appropriate land use planning, the UHI could be mitigated.
|
|---|
