Abstract
The accuracy of differential interferometric synthetic aperture radar (DInSAR) in monitoring the ground subsidence is a major challenge to be addressed urgently. Using the repeat track DInSAR and GIS spatial analysis tools, eight C-band Sentinel-1A SAR images of the Guotun coal mine (China) were processed to determine the mining subsidence from November 27, 2015 to July 24, 2016. The mining data of 13 working faces and the DInSAR- and leveling-monitored results were compared. A method was proposed to solve the problem of time inconsistency between DInSAR- and leveling-monitored results. The location, spatial distribution, scope, and variations of mining subsidence monitored by Sentinel-1A repeat track DInSAR were consistent with the mining progress of the working faces. The accuracy of the DInSAR-monitored subsidence values was directly related to the coherence of the subsidence zones, and the absolute difference from the leveling-monitored values was small at the subsidence edge but large at the subsidence center.
Highlights
Differential interferometric synthetic aperture radar (DInSAR) is an emerging technique that has overcome the limitations of the conventional measurement methods and realized the continuous monitoring of ground subsidence at large scale and for long-time periods.[1,2,3] In early development stages, it became an effective tool to monitor the deformation caused by crustal motions, such as earthquakes and volcanoes.[4,5,6,7,8] DInSAR technology can be used to detect surface subsidence at centimeter level or even millimeter level and has widely been used in the field of subsidence monitoring and post-treatment in mining areas.[9]
For surface subsidence DInSAR-monitoring in the Appin, Westcliff, and Tower coal mines in the UK, the results achieved an accuracy of Æ1 cm; ground subsidence caused by groundwater extraction and mining activities in the Ayntaio coal mine in Greece have successfully been detected by this technology; and further, combined with leveling, the dynamic law of surface in mining areas was explored.[10,11,12,13]
The results show that the Sentinel-1A repeat track DInSAR can accurately determine the location and spatial distribution of ground subsidence in the mining region
Summary
Differential interferometric synthetic aperture radar (DInSAR) is an emerging technique that has overcome the limitations of the conventional measurement methods and realized the continuous monitoring of ground subsidence at large scale and for long-time periods.[1,2,3] In early development stages, it became an effective tool to monitor the deformation caused by crustal motions, such as earthquakes and volcanoes.[4,5,6,7,8] DInSAR technology can be used to detect surface subsidence at centimeter level or even millimeter level and has widely been used in the field of subsidence monitoring and post-treatment in mining areas.[9]. Numerous researchers have accomplished significant work on mining subsidence monitoring with DInSAR. These studies demonstrate recent advances in theory and data processing techniques since its development. Its progress in practical engineering applications has not been ideal, due to its problem in accuracy. In-depth analysis of DInSAR subsidence monitoring accuracy and exploration of its monitoring capabilities can be used as an important reference in practical engineering applications
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