基于时序InSAR技术的南昌市地表形变监测分析

Analysis of Surface Deformation Monitoring in Nanchang Based on Time Series InSAR Technology

随着经济的快速发展,城市化进程不断加快。在人为的过度开发及自然因素的影响下,城市地表发生缓慢形变。精确且长时序的城市地表监测,对保障人民生活、防范潜在风险有着重大意义。选取了2021年1月至2023年1月覆盖南昌市区的38景Sentinel-1A影像,采用结合PS地面控制点的SBAS-InSAR技术进行处理,获取了沉降速率和累计形变量等地表形变信息,并与PS-InSAR结果交叉验证,确定其可靠性。研究表明,2种方法得到的监测结果具有较强相关性,相关系数达0.8956。南昌市形变总体稳定,大体可以分为3个沉降区和1个抬升区,结合地质构造、地下水特征和老旧小区改造资料,分析地表形变特征成因。

With the rapid development of economy and the continuous acceleration of urbanization process,under the influence of human over-development and natural factors,the urban surface deformation occurs slowly.Accurate and long-term urban surface monitoring is of great significance to protect people′s lives and prevent potential risks.In this paper,38 Sentinel-1A images covering the urban area of Nanchang from January 2021 to January 2023 were selected and processed by SBASInSAR technology combined with PS ground control points to obtain surface deformation information such as settlement rate and cumulative shape variables,and cross-verified with PS-InSAR results to determine its reliability.Research has shown that the monitoring results obtained by the two methods have strong correlation,with a correlation coefficient of 0.8956.The deformation of Nanchang city is generally stable,which can be divided into 3 subsidence areas and 1 uplifting area.The causes of surface deformation characteristics are analyzed based on geological structure,groundwater characteristics and reconstruction data of old districts.