MONITORING LAND SUBSIDENCE IN PANJIN REGION WITH SBAS-INSAR METHOD

Recently, the land subsidence problem in Panjin region begins to be concerned. In order to find out the current situation of land subsidence in Panjin region, we select 19 Radasat-2 SAR data of C band covering the study area during 2013-2016. We extract the land subsidence rate and cumulative amount of land subsidence in Panjin region using SBAS-InSAR method. The results show that there are two land subsidence centers in the study area. One center is Shusilian subsidence area. Its area is about 43.6 km² and its highest subsidence rate is -151.49 mm·a^-1. The other is Longwang village subsidence area. Its area is about 33.28 km² and its highest subsidence rate is -119.55 mm·a^-1. Through time series analysis of accumulative displacement, the land subsidence area expands with time, and the cumulative settlement increases. Compared with the leveling monitoring data, it is found that the settlement range and cumulative amount of land subsidence are generally consiste, but there is still difference between the two monitoring methods. The distribution of oilfield site, the drawdown funnel of groundwater level and the distribution of subsidence area in the study area are compared and analyzed. The results show that the land subsidence is closely related to the exploitation of groundwater, the exploitation of oil and gas resources, the new structure movement and so on. This study can provide the basis for the geological environmental management, the prevention and control of land subsidence and the development and utilization of resources.