南水北调中线区域地面沉降SBAS-InSAR监测研究

基于1 009景Sentinel-1A影像，利用SBAS-InSAR技术对南水北调中线区域地面沉降进行长时间序列监测。结果显示，整个中线沿线地面沉降主要分布于河北省东南部，最大形变速率为-139 mm/a，由于与渠道间有一定距离，因此对输水影响较小。北京市的最大形变速率为-133 mm/a，天津市西南部最大形变速率为-81 mm/a，但天津支线经过了2个沉降区，应当引起相关部门的重视。本文重点分析了南水进京后北京市地面沉降的时序形变特征，结合相关资料分析得知，南水北调工程有效补充了北京地区地下水储量，显著遏制了北京市地面沉降的发展态势。

Land Subsidence Monitoring Along the Middle Route of South-North Water Diversion Project by SBAS-InSAR

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.