城市水体对热岛的消减效应——以南京市为例

Urban Water Body Reduction of Heat Island Effect——A Case Study of Nanjing City

以南京市为研究对象,利用2013年8月11日的Landsat8TIRS热红外数据,基于大气校正法反演地表温度;结合土地利用现状数据,定性分析南京市热岛的空间分布;利用缓冲区分析、剖面分析,定量分析河流、湖泊等城市水体在周边不同范围内对城市热岛的消减作用.结果表明:利用大气校正法可准确反演出南京市地表温度空间分布;南京市热岛主要出现在人口密集、工业发达地区;城市水体在300m范围内可以显著消减城市热岛现象,地表温度由水体向周围递增;城市河流比湖泊对城市热岛的消减效果更显著.

Taking Nanjing as the research object, one Landsat8TIRS thermal infrared data in August 11, 2013 to retrieval surface temperature was first used based on the atmospheric correction method.The qualitative analysis was performed on the spatial distribution of the Nanjing city heat island combined with the data of Land-use map of Nanjing by using the spatial analysis method. The rivers, lakes and other city water reduction of urban heat island effect in different range were quantitatively analyszed by using buffer analysis and profile analysis. The results showed that： Using atmospheric correction method can accurately retrieval of Nanjingts land surface temperature distribution; Nanjingts heat island mainly appears in the densely populated and devel- oped areas; Urban water body in the 300 m range can significantly reduce the urban heat island phenomenon, the surface temperature is increasing from the center of water to the around; Rivers reducing from urban heat island effect is more significant than lakes.