Using DInSAR to Monitor Subsidence Caused by Underground Mining Utilising Block-Caving Method.
Curtin University of Technology,
Locked Bag 22,
Kalgoorlie, WA 6433,
This paper presents the results of an investigation into applicability of the satellite based Synthetic Aperture Radar Interferometry (InSAR), as a method for determination of surface deformations caused by mining. Special attention is given to the remote detection of subsidence caused by underground mining using the block-caving method in a vicinity of open pits. The possibility of using the DInSAR method, as an early detection (warning) system of slope instability, is also investigated. The climate conditions of Western Australia, dry cloudless weather with minimal rainfall, are conducive to very reliable SAR based interferograms. Interferograms with a long and short temporal baselines, are presented.
The quality of InSAR based monitoring of mining subsidence is evaluated and compared to classical deformation surveys. The research results suggest that the InSAR method is capable of detecting vertical ground movements, even over small areas. However, the quality of results highly depends on geometric configuration of satellite orbits. Unfortunately, there is no guarantee that the planned missions will deliver data that can be used for InSAR processing; in fact, large baselines may render SAR data unacceptable.
This paper presents results of the research project carried at the Western Australian School of Mines and supported by the WA mining industry and European Space Agency (ESA, Project Category 1:1123). Data from ESA's ERS-1 and ERS-2 satellites was used for this research.