基于遥感数据的徐州市热岛效应时空特征分析

Temporal and Spatial Characteristics of Heat Island Effect in Xuzhou City Based on Remote Sensing Data

热岛效应伴随着城市化推进而加剧,以徐州市为例,利用中心城区Landsat数据,结合城市化发展恢复增长后的不同阶段,采用单窗算法反演地面温度,对热岛强度进行分类统计,进而量化分析热岛效应的时空变化特征,为引导健康城市化发展提供决策依据。结果表明:在全天平均气温相近的情况下,徐州市主城区的地表温度逐年提升,伴随着城市的扩张,热岛效应在城市化进程中的各个阶段普遍存在,城市交通站场、工业集中区、商业集中区、工矿区及植被覆盖度较差的山体等范围易形成热岛中心,大面积的面状水体、绿化覆盖度较好的山体易形成城市冷岛,城市绿地系统的建设会有效缓解热岛效应。

Urban heat island effect is exacerbated along with the advancement of urbanization.Taking Xuzhou City as an example,the Landsat data in the main urban area in different stages after urbanization development resumes growth were used to retrieve the ground temperature by the single-window algorithm to classify and calculate the urban heat island intensity.The spatiotemporal characteristic of urban heat island effect is analyzed,which provides a decision basis for guiding the development of healthy urbanization.The results show that under the condition that the average temperature throughout the day is similar,the surface temperature of the main urban area of Xuzhou increases year by year.With the expansion of the city,the urban heat island effect is widespread in all stages of the urbanization process.Urban traffic stations,industrial concentration areas,commercial concentration areas,industrial and mining areas,and mountain areas with poor vegetation coverage are likely to form heat island centers.Large areas of surface water bodies and mountains with good green coverage are easy to form urban cold islands,and the construction of urban green space will effectively alleviate them.