Abstract: The accurate identification of spontaneous coal gangue dumps and the delineation of the temperature influence range are the key to safe production and ecological restoration in mining areas.The abnormal surface temperature during the spontaneous combustion of coal gangue dumps has become its most obvious sign.How to quickly identify spontaneous and potentially spontaneous coal gangue dumps on a large regional scale is crucial to the effectively development of governance and prevention work of spontaneous coal gangue dumps.Taking Landsat 8 TIRS as the data source,using atmospheric correction method to retrieve the surface temperature of Yangquan City,Shanxi Province in the winter of 2018 and the summer of 2019,at the same time,the highprecision landuse type map was obtained by supervised classification,and water bodies,vegetation and construction land have been removed.The threshold analysis method was used on the obtained surface temperature areas including bare land and coal gangue dumps,the results showed that the temperature range of the abnormal geothermal temperature in the winter of 2018 was 11.75~22.12 ℃,and the temperature of the abnormal geothermal temperature in the summer of 2019 ranged from 32.41 ℃ to 43.31 ℃.Using 42 known spontaneous gangue dumps for verification,the results showed that 32 and 27 spontaneous gangue dumps could be identified in the winter of 2018 and the summer of 2019,respectively,with an accuracy of 76.19% and 64.28%.Based on the above extraction results,the boundary and scope of the spontaneous coal gangue dumps was delineated,and the results showed that the high temperature influence range of the spontaneous coal gangue dumps exceeds 500 m.The above study results could provide a reference for the identification of spontaneous coal gangue dumps in mining area.

Key words: mine ecological restoration,spontaneous combustion gangue dump,Landsat 8,land surface temperature inversion,remote sensing recognition,supervised classification