关键词: 地表温度异常, 地下热传导, 煤层气, 热红外遥感

Abstract: Based on the analysis of land surface energy-radiation balance theory, the process of underground heat conduction is analyzed from aspects of rock/soil heat conduction capability and influence over rock thermal conductivity caused by coal-bed methane (CBM). The reasons of land surface temperature (LST) anomalies caused by the heat conduction from the depth of earth are discussed. LST at coal bed methane district is retrieved based on the ASTER data acquired over high CBM density area of Jiaozuo, Henan Province. The retrieved steps is as following: Firstly the atmosphere transmittance is simulated through MODTRAN 4 and land surface emissivity is calculated from NDVI. Then LST of study area is retrieved through split-window algorithm. The result demonstrates that the maximum LST is 302.67Ｋ and the minimum is 296.62Ｋ. LST anomalies can be easily identified in some area. The causes of LST anomalies area are analyzed and it can be deduced that the main reason of LST anomalies of study area is underground thermal conductivity anomalies caused by high CBM density. The conclusion needs further verification through other methods.

Key words: land surface temperature anomalies, underground heat conduction, coal-bed methane, thermal remote sensing