Effective Monitoring of Mining Activity Using InSAR Technology
Douglas Park - New South Wales, Australia
Highlights
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​InSAR analysis undertaken on time series of satellite images of the area.
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Data on horizontal sections compared with conventional survey sections to validate the satellite method.
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The data obtained by the satellite agreed remarkably well with the in-situ data obtained by conventional manual level surveys.
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Moreover, the results sat comfortably within the nominal tolerance of ±15mm dictated by the conventional method.
Longwall mining, a method used to extract coal from underground seams, can cause significant ground subsidence over large areas. This subsidence, which can persist long after mining operations have ended, can severely impact both natural environments and man-made structures. To address these challenges, precise monitoring is essential to mitigate risks and prevent damage.
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In Douglas Park, New South Wales, Australia, a comprehensive study utilized InSAR (Interferometric Synthetic Aperture Radar) technology to monitor mining-induced subsidence. This technology leverages radar satellites to capture high-resolution SAR (Synthetic Aperture Radar) images, providing valuable data on surface deformation across vast areas. By analysing the return signal from these radar images, researchers can assess changes in ground movement with remarkable accuracy.
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The study aimed to evaluate the effectiveness of InSAR processing by comparing satellite-based data with traditional in-situ survey results collected over a twelve-month period. Conventional survey methods struggled to cover the extensive area affected by mining, highlighting the need for advanced remote sensing techniques. InSAR, with its ability to capture detailed surface settlement data, proved to be a superior tool.
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The comparison between InSAR data and conventional survey data confirmed the reliability of satellite-based monitoring. By using radar satellites to gather SAR images, the study demonstrated how InSAR technology offers a non-intrusive, cost-effective alternative to traditional surveying methods. This approach is particularly beneficial for monitoring subsidence in areas with complex geological features and significant environmental impact, such as those involving open pit mining and slope stability concerns.
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Moreover, the study's success in Douglas Park illustrates the potential of InSAR technology for large-scale monitoring projects. Space agencies and researchers can use this technology to safeguard both natural landscapes and built environments, as well as to respect the interests of indigenous peoples and local communities affected by mining activities.
