Land Subsidence Spatio-temporal Variation Analysis Based on Multiple Source Data Field in Tianjin, China

Land Subsidence is a kind of slow evolution geological hazards which needs effective way to monitor. The causal and developmentsof land subsidence are complex. The monitor of land subsidence is also difficulty. So it is hard to analyze it in independent data source. This paper uses multiple source data to extract the high temporal and spatial resolution result. The deformations of land surface obtained from PS-InSAR method cover the whole land subsidence area in Tianjin from 2004 to 2008. This paper uses multi-source data field, such as the PS-InSAR land subsidence result, geologic structure data and groundwater flow field data to take further analysis. The paper analyzes the land subsidence distribution and evolution, the cause of the land subsidence and the relationship between land subsidence and groundwater flow field. Those can provide important reference to groundwater exploitation and urban planning.