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Summary of Proposal LAN1831

TitleMonitoring ground subsidence caused by groundwater withdrawal with archived high-resolution TerraSAR-X images
Investigator Sun, Qian - Central South University, Department of Geomatics
Team Member
Mr Hu, Jun - Central South University, Department of Geomatics
Prof. Zhu, Jianjun - Central South University, Department of Geomatics
Prof. Zou, Zengrong - Central South University, Department of Geomatics
Mr. Yang, Zefa - Central South University, Department of Geomatics
SummaryThis project aims to: (1) providea detail displacement map of the Tianjin, Shanghai and Xi’an with the TerraSAR-X interferometry; and (2) understand the correlation between the ground subsidence and the groundwater withdrawal in these areas. For monitoring the displacement of Tianjin, Shanghai and Xi’an withTerraSAR-X data, the conventional MT-InSAR will be developed to be applicable in the investigation of seasonal oscillation. The algorithm will be developed to better mitigate the atmospheric artifactsand deformation evolutions. We will integrate the small baseline strategy adopted in the SBAS approach and the point pair difference algorithm used in the PS approach, which is very important to avoid the fringe aliasing induced by the topography and deformation in the interferograms formed by high-resolution TerraSAR-X data. For investigating the correlation between the ground subsidence and the groundwater withdrawal in Tianjin, Shanghai and Xi’an, the groundwater data of these areas will be collected togetherwith the displacement evolutions. We combine the SBAS approach and the seasonal displacement model to measure the seasonal oscillation of these areas. The comparison and fusion between the ground subsidence and the groundwater data in these areas will be carried out. The local temperature data will also be used to analysis the rule of the deformations and forecast their future trends. The deliverables of this project may include: (1) displacement evolutions of Tianjin, Shanghai and Xi’an and (2) a number of scientific publications. The study is funded by the National Science Foundations of China (Modelling minimum and maximum detectable deformation gradients of interferometric SAR measurements), the Internal funding of Central South University (Development of Multi-Platform InSAR Technology), and the National High-tech Program of China (Integrating GPS, Corner Reflector and InSAR for Highway Monitoring).

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