【摘要】 城市热岛效应是当前城市气候与城市生态环境的研究热点。研究使用Landsat TM/ETM+遥感影像获取城市建成区信息和反演亮度温度,进而评价成都平原6个中等城市的热岛强度、热岛发育程度以及空间动态演变特征。研究发现,在"评价初期→评价中期→评价末期"过程中,成都平原6个中等城市的热岛强度前期增强、后期减弱;城市旧城区的热岛规模普遍减小,这说明,旧城区热环境有所改善,而城市扩展区的热岛规模普遍增大,是因城市扩展明显改变了地表自然环境,导致热岛效应出现,这与城市化进程的内在规律基本一致。绵阳等城市的研究成果表明,即使城市规模扩大,只要城市规划科学合理,并注重城市生态环境的保护,城市热岛效应也能得到有效缓解。更多还原

【Abstract】 At present,research about Urban Heat Island Effects(UHI) is a hot issue in urban climate and urban ecological environment.This research obtained brightness temperature and urban information using remote sensing data of Landsat TM/ETM +,and researched intensity,development degree,spatial structure and dynamic evolution of UHI of six medium-sized cities in Chengdu Plain.This research found that urbanization is the internal driving force leading to UHI.In the initial stage→interim stage→final stage,the overall heat island intensity trends in various cities in Chengdu Plain showed early enhanced and weakened late.The heat island size in the old town generally reduced,which indicated that the thermal environment has improved for the majority of the city’s old town.The size of the heat island in urban expansion area generally increased,because urban expansion significantly changed the natural environment,which leading to the heat island effect phenomenon.These research results are consistent with of urbanization inherent laws.Research results in Mianyang City also proved that,even if the urban scale expands,the urban heat island effect can be effectively alleviated,if urban plan is scientific and reasonable,and attached importance to protecting urban environment.更多还原