基于多源遥感的浅埋煤火时空特征分析—以乌达煤田火区为例

Spatio-Temporal Characteristic Analysis of Shallow Coal Fires Based on Multi-Source Remote Sensing: A Case Study of the Wuda Coalfield Fire Area

  • 摘要: 为解决单一遥感手段在浅埋煤火区域识别精度上的局限性,本文以乌达煤田火区为例,基于多景Landsat-8 OLI/TIRS Collection 2 Level 2影像和Sentinel-1 A影像分别获取了研究区地表温度和形变数据。采用阈值提取、双特征联合分析以及时空特征分析等方法进行了浅埋煤层火区多源遥感识别研究。结果表明:地表温度差异与季节变化显著相关,非夏季时段温度异常区域特征更突出,经阈值筛选和时间尺度验证得到的稳定温度异常区域与实测煤火区域基本吻合;研究区存在多处异常沉降区域,最大形变速率达-192mm/a,地表沉降区域与实测煤田火区分布基本一致。此外地表温度异常与形变异常在空间形态分布上存在细微差异,且温度与形变特征量峰值在空间分布上存在一定偏移;但在时间维度上二者表现出高度一致性。与单一遥感手段相比,采用地表长时序温度与形变时空联合分析方法,可有效剔除非煤火因素导致的温度异常与地表形变干扰,为煤火灾害的大范围普查与精准防治提供了有效的技术支撑。

     

    Abstract: To address the limitations of a single remote sensing method in the identification accuracy of shallow coal fire areas, this study takes the Wuda Coalfield fire area as a case study. Based on multiple scenes of Landsat-8 OLI/TIRS Collection 2 Level 2 images and Sentinel-1A images, multi-source remote sensing identification research on shallow coal seam fire areas was realized through methods like threshold extraction and spatiotemporal coupling analysis with overlay operations. The results show that the differences in surface temperature are significantly correlated with seasonal changes, and the characteristics of temperature anomaly areas are more prominent in non-?summer periods. The stable temperature anomaly areas obtained through threshold screening and time-scale verification are basically consistent with the measured coal fire areas. There are multiple abnormal subsidence areas in the study area, with a maximum deformation rate of -192 mm/a, and the distribution of surface subsidence areas is basically consistent with that of the measured coalfield fire areas. Surface temperature anomalies and deformation anomalies exhibit minor discrepancies in their spatial morphological distribution, and there is a certain spatial offset between the peak values of surface temperature and deformation; however, the two show obvious synergistic consistency in the temporal dimension. Compared with a single remote sensing method, By adopting the spatio-temporal combined analysis approach of long-term surface temperature and deformation, it can effectively eliminate the interference of temperature anomalies and surface deformation caused by non-coal fire factors, and offering reliable technical support for the extensive regional general survey and scientific prevention and governance of coal fire disasters

     

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