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Summary of Proposal CAL1992

TitleMultiscale Monitoring Surface Subsidence Resulting from Mining Using a Combination of Spaceborne and Airborne InSAR and GPS
Investigator Lv, Xiaolei - Institue of Electronics, Chinese Academy of Sciences, Science and Technology on Microwave Imaging Laboratory
Team Member
Associate Professor Wang, Yan - Aero Geophysical Survey & Remote Sensing Center, Remote Sensing Department
Professor Xia, Ye - Aero Geophysical Survey & Remote Sensing Center, Remote Sensing Department
Summaryp { margin-bottom: 0.08in; }Tangshan coalmine and Zunhua iron mine in Heibei Province are two of the biggest mines in China. Since 2000,more than 208 areas in Tangshan underwent subsidence due to the coal mining. The biggest displacement was around 10m according to the previous water-level measurement. It is possible to monitor the displacement or collapse by geodetic surveying methods. However, these methods have some difficulties to apply in hilly or forestry areas and are not able to find the appropriate measurement points due to the moving deformation centers in the mining regions. These difficulties can be overcome by joint application of radar remote sensing and the ground-based measurements. A project entitled“Development of a multiscale monitoring surface subsidence resulting from mining using a combination of spaceborne and airborne InSAR and GPS” is supported by the Chinese Academy of Science Foundation (CASF) and the National Natural Science Foundation of China (NSFC). Our project proposes a research plan to revolutionize our ability to monitor, manage and ensure the safety of mining. More specifically,our plan is to: (1) develop multiscale sensing and the optimal monitoring strategies, (2) obtain insight into the rheological behavior of near-surface materials, (3) propose a new analytical model that accounts for subsidence, and (4) assess the health of mines so that their safety can be more effectively managed. The long term continuous monitoring techniques include the satellite-based InSAR measurements from the TerraSAR-X satellite and the new high resolution GPS sensors with millimeter level accuracy. The InSAR satellite measurements will be employed along with the time-series InSAR techniques to obtain the high resolution estimates of the global displacement and settlement of mines. For now, we have the commercial software, Gamma, to implement the persistent scatter interferometry (PSI).We also have developed the second generation PSI, SqueeSAR-like technique and the joint scatterer InSAR (JSInSAR) technique. In situ and continue GPS measurements will be incorporated with the space-based InSAR measurements by the advanced data mining techniques. In our project, we would also like to monitor the surface subsidence from the mining areas using airborne InSAR images. The airborne InSAR data can be collected from the IECAS-SAR during the project period. The technique used for the airborne InSAR data is mainly the differential InSAR (DInSAR). The goal of the joint use of space-based and air-based InSAR is to compare their performance and find out the optimal monitoring strategies. In addition, the rheological behavior and the deformation or collapse model will be analyzed and the health of the mining regions will be assessed. Our investigation will transform the field of geohazard mitigation and enable a better control for the active mines. The data obtained from TerraSAR-X is crucial for success of this project. We are writing this proposal to acquire new TerraSAR-X SAR data for interferometry.We would like to obtain the TerraSAR-X data from 30 km x 60 km areas both in Tangshan and Zunhua, Hebei, China.

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