时序InSAR技术在水库监测中的应用研究

Research on application of temporal InSAR technology in reservoir inspection

摘要:

针对 InSAR 变形监测成本低、广域普查的特点，利用 Sentinel-1A 影像，对洛阳市某水库蓄水初期进行时序 InSAR 变形监测。经过变形监测将研究区划分为 4 个滑坡隐患区及 4 个城镇疑似沉降区，采用遥感普查+重点监测方案，对库区进行拦水坝变形分析、地质灾害高发区普查、城镇地表变形监测，最后整体评估水库蓄水工程对城镇地质扰动的影响。结果表明：2020—2021 年水库拦水坝中部为形变显著区，2 年间最大累计变形为54.1 mm，两侧变形数值呈对称状分布，符合迎水压力结构受力特征；水利工程建设对周边城镇的扰动几乎可以忽略不计，测区内整体呈稳定状态。时序 InSAR 技术非接触式监测地表地物变形，可为水库巡检预警机制提供新的技术方案。

Abstract:

In view of the characteristics of InSAR deformation monitoring in low lost and large-scale survey，Sentinel-1A image data is used to monitor the temporal InSAR deformation of a reservoir in Luoyang City at the initial stageof fi lling. After deformation monitoring，the study area is divided into 4 hidden landslide areas and 4 urban suspectedsubsidence areas. The remote sensing survey and key monitoring method is adopted to conduct dam deformationanalysis，survey of areas with high incidence of geological disasters，and urban surface deformation monitoring inthe reservoir area. Finally，the overall assessment of reservoir project impact on urban geological disturbance isformed. The results show that there is a signifi cant deformation in the central part of dam during 2020 to 2021，and themaximum cumulative deformation in 2 years is 54.1 mm. The deformation values on both sides of dam are distributedsymmetrically，which is consistent with the stress characteristics of water-facing pressure. The disturbance causedby water conservancy project construction to surrounding towns is almost negligible，and the overall state within thesurvey area is stable. Based on time series InSAR technology，non-contact monitoring of surface deformation providesa new technical solution for reservoir inspection and early warning mechanism.