南水北调中线区域地面沉降SBAS-InSAR监测研究

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

基于1009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。

Based on 1009 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.