武汉市城区热岛效应的遥感研究

随着城市化的迅速发展，城市热岛效应及其所带来的问题对我们日常的生产生活的影响变得日益严重和不可忽视。如何快速、有效地监测城市热场的分布和强度，是解决城市环境问题的迫切需要。采用先进的遥感手段，能够大面积、同步和动态地监测地面热场的分布和变化情况。利用武汉市地区的LANDSAl7 TM图像，对于热红外波段遥感图像灰度值和地面温度之间的关系进行了定量的解译，并且采用IHS图像复合增强的方法得到了武汉市地面热场分布图。取得了很好的模拟效果。结果显示武汉地区热场的分布具有明显的规律性，区域平均温度的分布由高到低为：旧型工业区-新型工业区-老城区-新城区-郊区；城市地面结构对于区域温度有直接的影响；保护现有的水体和增加绿地的分布是缓解城市热岛效应的有效途径。此外还结合图像分析了热场分布的形成因素。

INVESTIGATION ON HEAT-ISLAND EFFECTION IN WUHAN CITY ZONE BY REMOTE SENSING

With the rapid development of urbanization,problems caused by heat-island influence in big cities have become more and more serious and unneglectful than ever before.It is necessary and useful for city planners and managers to investigate rapidly and effectively the distribution,intension and effective factors of heat-island in these cities.By means of advanced remote sensing,the distribution and change of ground heat field can be monitored synchronously and continuously.In this paper,Wuhan was investigated as an example.A corelation model was built between ground temperature and image brightness of LANDSAT7TM Band6,and a map of ground heat field was made by IHS enhance method.Results shows that the heat field of Wuhan presents regular distribution.The areas from higher temperature to lower temperature are old industrial estates,new industrial estates,old city zone,new city zone and the suburb.It is also found that landcover affects directly the upper ground temperature,so heat-island effection may be weakened through protecting the existing water body and increasing the greenbelt of the city.In the end of the paper,several factors influencing the heat field of Wuhan are also analysed.