Abstract:Based on 1 009 Sentinel-1A images, we monitor land subsidence in the middle route by SBAS-InSAR. The results show that the land subsidence along the middle line is mainly distributed in the southeast of Hebei province, and the maximum deformation rate is -139 mm/a. There is a certain distance from the channel, which has little influence on water transport. The land deformation rate of Beijing is -133 mm/a, while that of southwest Tianjin is -81 mm/a, which is relatively small. However, as the Tianjin branch line passes through two subsidence areas, relevant departments should pay attention to it. The time-series deformation characteristics of land subsidence in Beijing area are analyzed; combining it with the analysis of relevant data, it can be concluded that the South-North Water Diversion project has effectively replenishment of groundwater reserves in Beijing, and significantly restrained the development of land subsidence in Beijing.
ZHANG Shuangcheng,YU Jing,SONG Mingxin et al. Land Subsidence Monitoring Along the Middle Route of South-North Water Diversion Project by SBAS-InSAR[J]. jgg, 2022, 42(12): 1300-1306.