基于时空角度的城市热岛效应演变研究——以甘肃省金昌市为例

Research on the Evolution of Urban Heat Island Effect from the Perspective of Time and Space:A Case Study of Jinchang City,Gansu Province

在城市化和全球气候变暖的背景下,为探究金昌市城市扩张可能导致的热岛问题及城市热岛效应与土地利用之间的关联关系,研究分析了甘肃省金昌市城市热岛的时空演变特征。文章通过地表温度反演与监督分类方法分析金昌市城市热岛与地表覆被在20年间的时空演变状况。研究发现,城市热岛和冷岛现象均存在一定的发展变化,且土地利用分布的变化对于城市热岛效应分布存在强相关关系。金昌市热岛效应在20年间时空演变显著,热岛问题主要集中在城市范围内建设用地与未利用地等区域,热岛高温区轮廓基本与以上两区域轮廓相吻合。金昌市城市热岛效应存在明显的时空演变差异,热岛区由北部逐渐向东部城市耕地与建成区转移。

Under the background of urbanization and global warming,in order to explore the heat island problem that may be caused by urban expansion in Jinchang City and the relationship between urban heat island effect and land use,the spatial and temporal evolution characteristics of urban heat island in Jinchang City,Gansu Province were studied and analyzed.The spatial and temporal evolution of urban heat island and land cover in Jinchang City in the past 20 years was analyzed by surface temperature inversion and supervised classification method.The study found that both urban heat island and cold island phenomena have certain development changes,and the change of land use distribution has a strong correlation with the distribution of urban heat island effect.The heat island effect in Jinchang City has evolved significantly in space and time in the past 20 years.The heat island problem is mainly concentrated in urban areas such as construction land and unused land.The outline of the high temperature area of the heat island is basically consistent with the outline of the above two areas.The urban heat island effect of Jinchang City has obvious spatial and temporal evolution differences,and the heat island area gradually shifts from the north to the eastern urban cultivated land and built-up area.