快速城市化区域城市热岛效应与驱动机制研究——以肇庆新区为例

The Process and Driving Forces of Urban Heat Island Effect in Rapidly Urbanized Regions:A Case Study of Zhaoqing New District

以肇庆新区为研究区,利用2013年、2015年、2017年、2019年和2021年夏季的Landsat8遥感影像反演研究区地表亮度温度,基于地表亮度温度数据识别和提取热岛区,分析城市热岛效应的演变过程和驱动机制。研究结果表明:(1)利用Landsat8遥感影像反演的地表亮度温度,能便捷有效地识别和提取城市热岛区,为城市热岛效应的研究提供科学的数据基础;(2)近10 a来,肇庆新区热岛效应逐年加剧,尤其是在2017—2019年大开发大建设期间,城市热岛效应扩张最为显著;(3)城乡建设用地与城市热岛区在时间变化和空间分布上均高度耦合,城市化的快速扩张是城市热岛效应的主要驱动因素;(4)面积较大的湖泊、河流、坑塘等水域,能将集中连片的城乡建设用地进行切割,进而有效缓解城市热岛效应。

Taking Zhaoqing New District as the study area,Landsat 8 satellite images were used to calculate the land surface brightness temper over study area from 2013 to 2021,which can be used to identify and extract the heat island.By analyzing the spatial-temporal coupling relationship between expansion of urban heat island and land use change,the driving forces of urban heat island effect were identified.The study found out that using Landsat8 satellite images to calculate the land surface brightness temper was an effective way to identify and extract the urban heat island,which can provide scientific data base for the study of urban heat island effect.In the past decade,the urban heat island effect has increased year by year,especially in the period of 2017-2019,the expansion of urban heat island effect was the most significant.The area of urban heat island was highly coupled with the area of urban and rural construction land,which proved that the rapid expansion of urbanization is the main driving force of urban heat island effect.The large water bodies such as lake,river and pond,can fragment the contiguous construction land,which can effectively decline the urban heat island effect.