福州核心区对城市热岛效应的影响

Influence of the urban core on urban heat island effects in Fuzhou city

采用定量遥感与GIS相结合的方法,利用福州市1988、2000年和2009年遥感影像,提取城市核心区,划分城市热岛效应区,定量分析福州市热岛效应区强度变化和空间结构变化.研究结果表明:1988、2000年和2009年,福州市城市核心区与非城市核心区的温度平均值差值分别为3.67、3.70℃和4.34℃,温度平均值差距增大,城市热岛效应显著增强;1988年福州市热岛效应区呈现双中心空间结构,2000年趋于多中心空间结构,2009年趋于集中连片分布.基于城市核心区进行城市热岛的提取与划分,可以显著提高研究精度,为城市热岛研究提供新的思路与方法.

Urban heat island effects have received more attention than ever because environmental problems caused by such effects have affected people＇ s daily life. In this paper, RS and GIS have been used to study the surface temperatures in Fuzhou City in 1988, 2000 and 2009 respectively. The strength and spatial distribution of urban heat island have been analyzed. The results have showed that with the city expansion, the difference values of the average temperature between the urban core and the suburb area were 3.67, 3.70 ℃ and 4.34 ℃ in 1988, 2000 and 2009 respectively which meant that the difference value of the average temperature increased and urban heat island effects enhanced. A double-nuclear spatial structure of the urban heat island existed in 1988, a multi-nuclear one appeared in 2000, and the concentration one developed in 2009. This research has much significance to the reasonable urban ecological planning and land use.