城市化下城市热环境与下垫面关系研究——以郑州市为例

Study on the Relationship between Urban Thermal Environment and Underlying Surface under Urbanization:A Case Study of Zhengzhou

随着城市化的发展,城市热岛现象日益增多,严重危害人体健康.基于Landsat 8数据,利用劈窗算法对郑州市地表温度进行反演,分析郑州市热环境空间分布,并对郑州市植被覆盖、不透水面与热环境关系进行定量分析,以此对城市规划建设及热岛效应防治提供借鉴依据.结果表明:(1)郑州市城市热岛效应明显,高温主要集中在三环内,三环与四环间以中温为主,四环以外以低温为主;(2)从各区热环境分布看,中原区、管城区、金水区以高温区、次高温区为主,二七区、惠济区以低温区为主;(3)地表温度与植被覆盖高度负相关,与不透水面高度正相关,两者结合可起到综合降温作用.

With the development of urbanization,the phenomenon of urban heat island is increasing,which seriously endangers human health.Based on Landsat 8,the land surface temperature of Zhengzhou is retrieved by using the split window algorithm.The spatial distribution of thermal environment in Zhengzhou was analyzed,and the relationship between vegetation cover,impervious surface area and thermal environment in Zhengzhou was quantitatively analyzed to provide reference basis for urban planning and construction and heat island effect control.The results show that:(1)The urban heat island effect of Zhengzhou is obvious,and the high temperature is mainly inside the tricyclic ring;(2)Viewing from the distribution of thermal environment in different areas,the Zhongyuan District,Guancheng District and Jinshui District were dominated by high temperature area and secondary high temperature area;(3)The land surface temperature is negatively correlated with vegetation cover and positively correlated with the impermeable surface area,and the combination of the two can play a comprehensive cooling effect.