兰州时空热岛2.doc

基于时序TM影像的兰州市城市热环境格局 尹柯柯魏冠军杨阳 （1.兰州交通大学测绘与地理信息学院，兰州 730070； 2.甘肃省地理国情监测工程实验室，兰州 730070 3.中国测绘科学研究院，北京 100830） 基2004）和），反演兰州市地表温度，市近21的城市热岛空间以及演变特征，并利用景观态学方法分析了间各个热岛等级之间的演变特征表兰州市热岛面积以次级热岛为主，而速率最快为热岛热岛的扩展向与城用地延伸方向一致；过程强热岛→热岛→正常区→绿岛→冷岛，其逆过程则是向相反方向逐级演变，越级转变的可能性相对较小，强热岛对于城市下垫面的变化最为敏感。 关键词：城市热岛；时空演变；景观生态学；兰州市 【中图分类号】P 【文献标识码】A 【文章编号】1009-2307（2015）02- Dchange-analysis of Urban Heat Island in Lanzhou based on TM images of time-series Yin Keke1, 2, Wei Guanjun1, 2, Yangyang1, 2, 3 (1.Faculty of Geomatics, Lanzhou Jiaotong University, Lanzhou 730070, China;2.Gansu Provincial Engineering Laboratory for National Geographic State Monitoring, Lanzhou 730070, China;3. Chinese Academy of Surveying and Mapping, Beijing 100830, China) Abstract: Based on Landsta5 (1994,2004) and Landsat8 (2015) images, this paper retrieved the land surface temperature (LST) of Lanzhou City by Image-based Method, studied the space distribution and evolution characteristics of urban heat island (UHI) and analyzed quantitatively evolution characteristics of between each level of heat island by the method of landscape ecology in this 21 years. The results show that the heat island area was mainly secondary heat island, the fast propagation rate was the strong heat island, and the direction of heat island and development of cities had same direction in Lanzhou; “strong heat island →secondary heat island → normal area → green island → cold island” was about the evolution process of UHI , the inverse process was the opposite direction step by step evolution, the possibility of bypass-change was relatively small and the strong heat island was the most sensitive for change of city underlying surface. Keywords: Urban Heat Island; spatial-temporal evolution; Landscape ecology; Lanzhou City 0引言 1-3]。Kaufui V.W.等4]对美国2000年，高温热浪使死亡率增加7%；1980年5]。因此，准确的获取城市热岛的空间格局及其动态变化，了解这些变化对城市坏境和城市小气候的影响，对于提高城市环境质量，建设生态城市均有十分重要的意义。 近年来，随着空间信息科学的发展，遥感技术已经被广泛应用于城市热岛研究。城市热岛的空间分布、结构时空动态演变是目前城市热岛研究的重要内容之一，也是进一步探讨城市热岛的驱动因子、模拟和预