基于地理探测器的合肥市热岛效应影响因素分析

Analysis of Influencing Factors of Heat Island Effect in Hefei City Based on Geographical Detectors

地表温度是城市热岛效应的重要指标。本文利用合肥市2018年4月10日的Landsat-8 OLI影像数据,经过预处理后,采用大气校正法反演地表辐射温度,并提取研究区域的归一化差分植被指数(NDVI)、归一化差分水体指数(NDWI)。通过地理探测器模型,探测地表温度和海拔、NDVI、NDWI等因子之间的影响关系。结果表明:合肥市存在热岛效应。通过分析地理探测器模型的探测结果可知:从单一因子探测角度分析,影响合肥市地表温度的主导因子为NDVI和NDWI;从两因子交互作用影响角度分析,NDVI对因子交互作用的影响最强。研究结果有利于分析合肥市热岛效应的影响因素,为城市规划、生态环境保护提供科学依据。

Surface temperature is an important index of urban heat island effect.Based on the Landsat-8 OLI image data of Hefei city on April 10,2018,after preprocessing,the atmospheric correction method is used to retrieve the surface radiation temperature,and the normalized difference vegetation index(NDVI)and normalized difference water body index(NDWI)of the study area are extracted.The relationship between land surface temperature and altitude,NDVI,NDWI and other factors was detected by the geographic detector model.The results show that there is heat island effect in Hefei.The results show that NDVI and NDWI are the dominant factors affecting the surface temperature of Hefei city from the single factor detection analysis;From the analysis of the interaction between the two factors,NDVI has the strongest influence on the interaction.The results are helpful to understand the influencing factors of heat island effect in Hefei and provide scientific basis for urban planning and ecological environment protection.