福州市城市热岛效应的转移矩阵与缓冲区

Transfer matrix and buffer of the urban heat island effect in Fuzhou

为了研究福州市的城市热岛效应,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变化和空间结构变化.结果表明:①1989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.②随着时间的推移,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.③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,随着时间的推移,热岛效应综合指标趋于增大,热岛效应增强.

In order to study the urban heat island effect of Fuzhou,the urban core regions were extracted and the heat island regions were divided to quantitatively analyze the intensity change and spatial structure changes of the heat island effect region in Fuzhou using a method combining quantitative remote sensing and GIS based on TM remote sensing images of Fuzhou in 1989,2000,and 2016.The results show that:①In 1989,2000,and 2016,the average temperature differences between urban core region and non-urban core region in Fuzhou are 3.67℃,3.70℃,and 5.38°C,respectively,and the heat island effect is significantly enhanced;in 1989,the urban heat island effect region 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 distri-buted in 2016.②With time goes,the lower grade heat island effect areas are continuously transformed to the higher grade heat island effect area,and the region with strong heat island is increasing.③The 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.