Analysis of monitoring ground subsidence in Dangshan County of Anhui Province based on SBAS-InSAR technology

The landforms in North Anhui are dominated by plains, and the land subsidence is the main geological disaster. Based on the Small Baseline Subsets (Small Baseline Subsets-Interferometric Synthetic Aperture Radar, SBAS-InSAR) method, the surface deformation in Dangshan County was monitored through the 47 scenes Sentinel-1A ascending SLC (Single Look Complex) imageries acquired from May 2017 to December 2021. The distribution maps of ground subsidence and the cumulative surface displacement map of the Dangshan area during monitoring period were obtained, and the temporal-spatial variation characteristics of subsidence in this area were analyzed. The results revealed that the ground subsidence are significant in Gaoxin District and Economic Development District, revolving around the Dangcheng Town. Moderate subsidence occurred along the east-west direction of Xuanmiao Town in north of the old Yellow River, and distribution of subsidence is closely related to the overexploitation of groundwater and the geotechnical properties. Regular monitoring of the distribution and magnitude of land subsidence can mitigate the exposure of a growing urbanized population to such hazards.