昆明市主城区热岛效应特征及驱动机制分析

Analysis of Characteristics and Driving Mechanism of Heat Island Effect in Kunming

选用昆明市主城区Landsat8遥感影像为基础,计算建筑指数,植被指数,水体指数。通过缨帽变换提取土壤湿度指数。利用大气校正法反演地表温度。利用地理信息系统分析昆明市主城区热岛的空间分布特征,时间演变特征以及热岛效应的驱动机制。结果表明人为活动和高密度建筑区域对热岛形成的作用较大。研究区热岛效应呈现两极分化,高低温区均有所增加。土壤湿度,水体,植被对热岛效应有缓解作用,但抑制作用远低于人为活动的促进作用。

The Landsat8 remote sensing image of main city in Kunming was used to calculate the NDBI, NDVI, MNDWI. The soil humidity index was extracted through Tasseled Cap Transformation. The Radiative Transfer Equation was used to extract land surface temperature. Geo-Information system was used to discuss the distribution characteristics, evolution characteristics and the mechanism of UHI （Urban Heat Island Effect） of main city in Kunming. Results show that High density building area and human activity made a greater contribution to the heat island. The UHI area of Kunming main city displayed a polarization appearance, low temperature and high temperature areas were increased. Soil humidity, water and vegetation could relieve the UHI but the inhibitory action was weaker than the acceleration of human activity.