地面沉降时序InSAR技术监测研究

Research on InSAR Technology Monitoring of Ground Subsidence Time Series

摘要: 针对传统地面沉降测量方法在大范围测区内费时长、时效性差等缺点，本文利用2017~2021年覆盖某地区Sentinel-1A影像数据，采用永久散射体雷达干涉技术(PS-InSAR)和短基线合成孔径雷达干涉测量技术(SBAS-InSAR)获取地面沉降数据，通过地表形变信息的时空分析确定各类因素对地面沉降的影响并交叉验证结果的可靠性。分析结果表明，该地区的地面沉降受到降水、第四系地层厚度、地下水等因素影响。其中，该地区在2017~2021年之间存在地面沉降现象，最大沉降速率为−130 mm/y，最大抬升速率为40 mm/y，最大累计沉降量为−411 mm。重点沉降区域主要分布在东北部的杨家泊镇和寨上街道交界地区，以及西南部的中塘镇和北大港水库附近。

Abstract: In response to the shortcomings of traditional land subsidence measurement methods such as time-consuming and poor timeliness in large-scale measurement areas, this paper uses Sentinel-1A image data covering a certain area from 2017 to 2021, and uses permanent scatterer radar interferometry technology (PS InSAR) and short baseline synthetic aperture radar interferometry measurement technology (SBAS InSAR) to obtain land subsidence data, determining the impact of various factors on land subsidence through spatiotemporal analysis of surface deformation information and cross-validate the reliability of the results. The analysis results indicate that land subsidence in the region is influenced by factors such as precipitation, thickness of the Quaternary strata, and groundwater. Among them, there was ground subsidence in the region between 2017 and 2021, with a maximum subsidence rate of −130 mm/y, a maximum uplift rate of 40 mm/y, and a maximum cumulative subsidence of −411 mm. The key settlement areas are mainly distributed at the junction of Yangjiabo Town and Zhaishang Street in the northeast, as well as near Zhongtang Town and Beidagang Reservoir in the southwest.