近30年武汉市热环境格局演化机制及扩散模式研究

A study of evolution mechanism and diffusion mode pattern of thermal environment for Wuhan City in the past 30 years

基于1987—2015年间Landsat TM/TIRS数据反演主城区的地表温度并进行归一化处理,分析武汉市热环境格局的演化机制,并探讨了其扩散模式特征。研究结果表明,武汉市主城区在近30 a间城市热环境格局发生了较大变化,随着城市建设用地的扩张,热环境格局的扩散模式由起初的点状分布向条状、带状和面状分布演变;武汉市热环境格局的形成与演化机制与太阳辐射、大气环流和下垫面性质等自然因素以及城市建设与发展阶段、规划政策等人为因素密切相关。

This paper,based on Landsat TM/TIRS between 1987 and 2015,deduced the surface temperature of the main city, conducted the normalized treatment of the land surface temperature, analyzed the evolution mechanism of the thermal environment in Wuhan City and discussed the characteristics of its diffusion model. The results show that the urban thermal environment has changed greatly in Wuhan City during the past 30 years. With the expansion of urban construction land,the diffusion pattern of the thermal environment pattern has evolved from the initial point-distribution to the stripe shape and zonal-distribution. The formation and evolution mechanism of the thermal environment in Wuhan City is closely related to the natural factors,such as solar radiation,atmospheric circulation and underlying surface properties,as well as the human factors,including the urban construction and development stage,planning policy,and so on.