基于遥感技术的内蒙古乌达煤田火区碳排放计算

为了获得煤田火区的碳排放量,建立了计算煤田火区CO2排放通量法模型,其中,确定火区面积是该模型的关键基础参数。采用2011-01-24的ASTER L1B热红外遥感数据反演内蒙古乌达煤田火区的地表温度,提出基于梯度的自适应阈值法,以热红外图像梯度极值为阈值圈定火区范围,估算得到乌达煤田火区面积为239.6 hm2。利用排放通量法模型,依据遥感和其他手段获得的基础参数数据,计算了乌达煤田火区的碳排放量,结果显示乌达煤田火区每年的CO2碳排放量达37.9×104t。

Calculation of carbon emission of Wuda coalfield fires in Inner Mongolia based on remote sensing technology

This paper aims to put forward an emission flux method for calculating the amount of CO2 carbon emission in coalfield fires.In this method，the area of coalfield fires is an essential modeling parameter.In order to obtain this basic data，the thermal infrared remote sensing data on January 24，2011 obtained by Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER) were used to inverse the surface temperature of fires in Wuda coalfield，Inner Mongolia，China.Then a Self Adaptive Gradient Based Thresholding method was applied to segment the thermal infrared image by a threshold，the mean temperature of the extreme gradient points for the temperature image.This threshold was applied to delineate the coalfield fire areas.The total area of coalfield fires in Wuda coal field was estimated as 239.6 hm2 in January 2011.Through the emission flux method and basic parameters generated by the density model of the fissures in the coalfield，the amount of CO2 carbon emissions by coalfield fires in Wuda coalfield was estimated and the result shows that the annual equivalent carbon dioxide emission in Wuda coalfield fires is up to 37.9 ×104 tons.