Yuyang mine is located in the semiarid western region of China where, due to serious land subsidence caused by underground coal exploitation, the local ecological environment has become more fragile. An advanced interferometric synthetic aperture radar (InSAR) technique, temporarily coherent point InSAR, is applied to measure surface movements caused by different mining conditions. Fifteen high-resolution TerraSAR-X images acquired between October 2, 2012, and March 27, 2013, were processed to generate time-series data for ground deformation. The results show that the maximum accumulated values of subsidence and velocity were 86 mm and 162 mm/year, respectively; these measurements were taken above the fully mechanized longwall caving faces. Based on the dynamic land subsidence caused by the exploitation of one working face, the land subsidence range was deduced to have increased 38 m in the mining direction with 11 days’ coal extraction. Although some mining faces were ceased in 2009, they could also have contributed to a small residual deformation of overlying strata. Surface subsidence of the backfill mining region was quite small, the maximum only 21 mm, so backfill exploitation is an effective method for reducing the land subsidence while coal is mined.
Because of groundwater over-exploitation, the land subsidence of Tianjin city has become more and more serious. Some
researchers tried to use D-InSAR technique to monitor the subsidence of this area. However, D-InSAR has some
problems such as space and time baseline decorrelation and atmospheric influence. In order to obtain long time series
land deformation with high accuracy, SAR image set to monitor land subsidence has become a research focus. PSDInSAR
(Persistent Scatterers-DInSAR) and SBAS (Small Baseline Sets) are two classical methods to monitor land
subsidence by SAR images. The former chooses one image as the master and the latter chooses several images as the
masters according to the threshold of baselines. Using eighteen ERS images and SRTM DEM data the land subsidence
of Tianjin city from 1992 to 1998 was obtained by two methods mentioned. 18906 and 42041 PS points were identified
respectively by PS-DInSAR and SBAS. While, 16.4 mm/a and 24.2 mm/a of the mean maximal subsidence velocities
were obtained respectively. Although they are different in values, the distributions and subsidence laws of points are
nearly same.
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