基于时序InSAR的上海地区2018~2020地铁沿线沉降监测分析

基于覆盖上海地区2018~2020年的35景Sentinel-1A影像数据，采用PSInSAR方法获取该地区3条地铁线路的年平均沉降速率和累积沉降量，并分析沉降原因。结果表明：1）上海地区呈现不均匀沉降，沉降主要发生在上海市主城区南部的闵行区许泾村附近，最大累积沉降量达-47.3 mm；2）上海市闵行区出现明显的沉降漏斗现象，并与该地区城市基础设施建设及地下水水位变化呈正相关；3）上海市地铁5、8、16号线路均有部分路段存在明显沉降现象，地铁5号线途经闵行区周围时沉降最明显，最大沉降速率达-12.0 mm/a。最后给出上海地区以及主要地铁沿线地表沉降的时空特征和地表沉降与其影响因子之间的相互关系。

Analysis of Time-Series InSAR-Based Settlement Monitoring along the 2018-2020 Metro Line in Shanghai Area

Based on the Sentinel-1A image data of 35 scenes covering Shanghai from 2018 to 2020, we use the PSInSAR method to obtain the annual average settlement rate and cumulative settlement of three metro lines in Shanghai, and analyze the reasons. The results show that: 1) The uneven settlement occurs in Shanghai, which mainly occurs near Xujing village, Minhang district in the south of the main urban area of Shanghai, with the maximum cumulative settlement of -47.3 mm. 2) The obvious settlement funnel appears in Minhang district of Shanghai, which is positively correlated with the urban infrastructure construction and groundwater level changes in this area. 3) There are some section of Shanghai metro lines 5, 8 and 16, with obvious settlement phenomenon, and the settlement around metro line 5 passing through Minhang district is the most obvious, with a maximum settlement rate of -12.0 mm/a. This study shows the spatio-temporal characteristics of surface settlement and the relationship between surface settlement and its influencing factors in Shanghai and along the main metro lines.