宿迁市城市热环境与热力景观时空分析

Spatial-temporal Analysis of Urban Thermal Environment and Thermal Landscape in Suqian City

为了探讨宿迁城市化进程中热岛景观格局的演变特征,采用1992年、2003年和2014年3期6景Landsat遥感数据,使用单窗算法基于热红外波段反演地表温度,并利用景观格局指数分析宿迁城市热岛景观格局随城市化进程演变的趋势。结果表明,近23 a来宿迁城市热岛效应持续增强,宿迁经济开发区北区、洋河新区等地形成新的高温区域;在类型水平上,城市化高速发展的2003年城市热岛景观格局最为破碎;在景观水平上,热力景观越来越集聚化,异质性增加。

To explore the evolution characteristics of thermal landscape pattern during Suqian's urbanization,six scenes of Landsat images captured in of1992,2003 and 2014 were used to classify land cover,and extract impervious surface as the symbol of urban expansion.Land surface temperature(LST)was retrieved by Mono-window algorithm from the thermal infrared band of TM/ETM~*/OLI.Landscape metrics were used to quantify changes in the urban thermal landscape pattern.The results show that①in nearly 23 years,the urban heat island effect is enhancing.Northern Suqian national economic and technological development area,the Yanghe River newtown have developed as new urban heat islands.②On the class level,the thermal landscape is the most fragmented in 2003,which in the rapid development of urbanization.③On the landscape level,thermal environment landscape becomes more gathered gradually,and heterogeneity is increasing.