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摘要
This paper presents an application example of the use of the Differential Interferometry Synthetic Aperture Radar technique (DInSAR) for monitoring ground movements in a geologically complex area around the village of Suria (Ebro Basin, Catalonia, NE Spain), associated to underground mining activities and to the presence of a salt dome. %26lt;br%26gt;The analysis has been mostly performed in a rural environment affected by ground movements with different patterns, magnitudes and causes. A total of fifty SAR images recorded between 1995 and 2007 were processed to generate the interferograms. In order to study the non-linear trends or changes of the ground surface behavior, the DInSAR technique was applied in two sets of images. %26lt;br%26gt;The interferometric results, in the form of vertical displacement rate maps, were checked against conventional surveying and GPS measurements. The results present a significant discrepancy in some location due to the wrapping of the phase when both fast and significant deformations occur. In order to avoid the latter effect and improve the accuracy of the results, all SAR images were reprocessed using topographic leveling and GPS data of different monitored points. %26lt;br%26gt;To support the DInSAR interpretation, a detailed geological reconnaissance of the study area was carried out as well as an inventory of ground movement indicators. Four different patterns of ground movement have been identified: active shifting subsidence associated to the progression of the mining exploitation fronts; residual subsidence on abandoned galleries with a decreasing rate of closure; uplifting due to the intrusion of the salt dome; and sudden ground collapses (sinkholes) caused by the dissolution of soluble materials laying close to the ground surface.
- 出版日期2014-2-20
