天津LNG码头SBAS-InSAR时序形变及地面监测数据响应分析

为了查明油气重大基础设施中，由星载雷达干涉测量、地面GNSS形变监测、地下位移传感器监测和管道应力应变监测网络构成的星地一体化监测技术的有效性，本文采用SBAS-InSAR技术提取了天津LNG（Liquefied Natural Gas ）码头区域油气管线区域的长时间序列的地表形变数据，进一步分析了地面GNSS（全球导航定位系统）地表位移、多层深度位移计、管道应变传感器数据与同步的SBAS-InSAR地表形变量的数据响应关系，并进一步分析了雨-旱循环的时序变化规律。结果表明：2019年5月-2022年4月的3年间天津LNG码头区域非均匀沉降最为显著，最高达到-394mm；SBAS-InSAR的时序形变数据15-53mm的沉降形变，在GNSS中有9-57mm的地表位移响应，两者相关显著，具有良好的一致性；SBAS-InSAR地表形变变化特征与多层位移计在1m、2m和3m深的位移数据响应特征都与降水量关系密切，呈现显著的雨季-旱季波动特征，二者具有良好的同步性，说明SBAS-InSAR地表形变变化特征能够揭示地下土层的位移变化特征；SBAS-InSAR地表沉降量与地下管道应变呈正相关， SBAS-InSAR获取的地表形变是反映地下管线应变的良好指标。由星载雷达干涉测量、地面GNSS形变监测、地下位移传感器监测和管道应力应变监测网络构成的星地一体化监测数据的集成应用，能够为未来星地一体化的管道安全监测技术体系构建提供有益的借鉴。

The SBAS-InSAR Time Series Deformation and its Response in Ground Monitoring Datasets in Tianjin LNG Dock

Satellite remote sensing technology and ground sensors together constitute a united safety monitoring network for major oil and gas infrastructure. The satellite retrieved surface parameters integrated with in-situ measurements has gradually become a hot research topic in remote sensing applications. Combined with ground sensor network monitoring data, the temporal changes of surface subsidence detected by the SBAS InSAR technology were analyzed, and the data response relationship between the GNSS (Global Navigation and Positioning System) surface displacement, multi-layer depth displacement gauge, pipeline strain data, which synchronized SBAS-InSAR surface deformation, were also explored, as well as the influence of annal rainfall -drought cycle is further analyzed. The results show that the most serious SBAS-INSAR land subsidence from May 2019 to April 2022, reaching a maximum of -394mm, which located in the pipeline corridor area of the LNG (Liquified Natural Gas) Harbor. The SBAS-InSAR retrieved 15-53mm surface subsidence, has a 9-57mm displacements response in GNSS, and they are significantly correlated and have a good consistency in temporal fluctuation; The characteristics of surface deformation changes in SBAS-InSAR and the response characteristics of displacement data from multi-layer displacement meters at depths of 1m, 2m, and 3m are closely related to precipitation, showing significant fluctuations between rainy and dry seasons. The two have good synchronicity, indicating that SBAS-InSAR surface deformation changes can reveal the displacement change characteristics of underground soil layers; The surface subsidence of SBAS-InSAR is positively correlated with the underground pipeline strain, which implies that the SBAS-InSAR retrieved land subsidence is a good indicator of the strain of underground pipelines. The integrated application of time series deformation data from SAR interference processing and the underground pipeline monitoring data can provide useful reference for the construction of future satellite ground integrated pipeline safety monitoring technology system.