近10 a武汉市城市热岛效应演变及其#br# 与土地利用变化的关系

城市化进程的加快，农村人口大量涌入城市，城市布局及局部气候改变等因素使得城市热岛效应问题日益突出，已成为当前城市环境研究热点之一。以武汉市为例，应用遥感技术与地理信息系统技术，选取2004~2015年5个时相Landsat系列影像数据，利用单窗算法反演地表温度，并以此为基础进行热岛强度分级，获取了近10 a武汉市城市热岛效应变化结果，并分析了武汉市11个辖区城市热岛效应动态变化特征及热岛效应与土地利用变化的关系。研究结果表明：（1）自2007年后，武汉市老城区热岛面积持续减少，而新城区热岛面积则持续增加，呈现出以老城区为中心向新城区扩张的趋势，至2015年，新老城区热岛面积仅相差20.74 km2；（2）东西湖区、蔡甸区、江夏区与洪山区是近些年城市热岛面积增长较为显著的辖区，其中江夏区的热岛面积年际变化最大，最高值达95.42 km2；（3）城市热岛效应与土地利用类型的面积年际平均值拟合关系显示，2004~2015年，城市热岛效应与建筑用地的R2值最大，为0.681 2，建筑用地面积的增加是城市热岛强度面积扩张的重要影响因素。

EVOLUTION OF URBAN HEAT ISLAND EFFECT AND ITS RELATIONSHIP WITH LAND USE CHANGE IN WUHAN CITY IN RECENT 10 YEARS

With the speeding up of urbanization,urban population is increasing constantly since the rural people get more chances to work in urban area.There was a huge change of urban structure and topoclimate,so the study on the urban heat island effect has become one of the hottest fields globally.This study focus on Wuhan city as an example,by integrating five time phase Landsat image data from 2004 to2015,using RS and GIS technologies and the mono-window algorithm with inverting calculation,generating land surface temperature (LST) data and the urban heat island intensity data in recent 10 years,and analyzed the characteristics of the spatiotemporal variation of urban heat island effect in Wuhan city in 11 main districts and the relationship between heat island intensity and the change of land-use type.The results indicated that:(1) the urban heat island intensity decreased continually in the old town,but increased all the time in the new town of Wuhan city after 2007,and the urban heat island area differential between the old and new town was getting smaller,with only 20.74 km2 gaps in 2015.(2) The urban heat island area of Dong Xihu district,Cai Dian district,Jiang Xia district and Hong Shan district increased more dramatically than other jurisdictions in Wuhan city in recent years.The inter-annual variability of the heat island area in Jiang Xia district was the largest and the peak value was 95.42 km2.(3) The results of fitting relationship between heat island area and land-use type area in Wuhan city from 2004 to 2015 showed that the R2 value between the urban heat island and building land arrived the maximum 0.681 2.The increase of the building land area was an important factor for the heat island area rise in Wuhan city.