福州市城市热岛效应时空演变研究

Study on Spatial-Temporal Pattern of the Urban Heat Island Effect in Fuzhou

基于福州市1989年、2000年和2016年的TM遥感影像,采用遥感与GIS相结合的方法提取城市核心区,划分热岛效应区,研究福州市热岛效应区的热岛强度以及空间结构变化。研究结果表明:1989年、2000年和2016年,福州市城市核心区与非城市核心区的平均温差分别为3.67℃、3.70℃和5.38℃,热岛效应显著增强;1989年福州市热岛效应区呈现双中心结构,2000年呈现多中心结构,而2016年则呈现连片分布结构。随时间的推移,等级较低的热岛效应区不断向等级较高的热岛效应区转化,热岛强度较强的地区面积不断增大。缓冲距离越远,热岛效应综合指标趋于降低,热岛效应减弱;在缓冲距离相同的地方,随时间的推移,热岛效应综合指标趋于增大,热岛效应增强。

A method combining quantitative remote sensing and GIS is used.Using the TM remote sensing images of Fuzhou in 1989,2000,and 2016,the urban core area is extracted and the heat island effect area is divided in order to study intensity change and spatial structure changes of the heat island effect area in Fuzhou.The results show that:1)In 1989,2000,and 2016,the average temperature difference between urban core and non-urban core areas in Fuzhou is 3.67℃,3.70℃,and 5.38℃respectively.And the heat island effect is significantly enhanced;in 1989,the urban heat island effect area of Fuzhou presents a dual-center spatial structure,which tends to be a multi-center spatial structure in 2000,and tends to be contiguous and distributed in 2016.2)With time goes,the lower grade heat island effect area is continuously transformed to the higher grade heat island effect area,and the area with strong heat island is increasing.3)The longer the buffer distance is,the smaller comprehensive indicator of the heat island effect is,and the heat island effect weakens.At the same buffer distance,the general indicator of the heat island effect tends to increase and the heat island effect strengthens with time.