时序InSAR监测京雄城际铁路河北段地面沉降

Monitoring land subsidence of Hebei section of Beijing-Xiong'an intercity railway by time-series InSAR

本文以京雄城际铁路河北段固安站至雄安站沿线作为研究区,利用2018—2020年共34景Sentinel-1B影像,基于小基线集雷达干涉测量技术(SBAS-InSAR)获取京雄城际铁路河北段沿线的地面沉降时空分布信息,结合空间自相关分析方法,揭示研究区地面沉降的空间分布格局,并对沉降原因进行初步分析。研究结果表明,京雄城际铁路河北段沿线地面沉降发展由北向南存在一定的差异。北部年均沉降速率小于10 mm/a,南部沉降较为严重,最大年均沉降速率达-105.6 mm/a,且沿线西部年均沉降速率高于东部区域。通过分析影响因素得知,地面沉降量与地下水埋深值存在相关性,地下水埋深高的地区地面沉降量较高。同时结合研究区土地利用变化结果发现,城市化建设所产生的静载荷对京雄城际铁路沿线的地面沉降产生一定的影响。

In this paper,the spatial and temporal distribution of land subsidence along the Beijing-Xiong'an intercity railway(Hebei section),from Gu'an station to Xiong'an station,is obtained by using 34 Sentinel-1B images from 2018 to 2020 based on SBAS-InSAR technology.Then,the spatial autocorrelation analysis is used to understand the spatial distribution characteristics of land subsidence in the study area.Finally,the causes of subsidence are analyzed combined with the hydrological data.The results show that,the development of land subsidence along Hebei section of Beijing-Xiong'an intercity railway is different from north to south.The average annual settlement rate in the north is less than 10 mm/a,and the maximum annual settlement rate in the south is-105.6 mm/a,and the average annual settlement rate in the west is higher than that in the east.By analyzing the influencing factors,it can be concluded that there is a correlation between ground subsidence and groundwater depth,and the area with high groundwater depth has a higher ground subsidence.At the same time,combined with the results of land use change in the study area,it is found that the static load caused by urbanization has a certain impact on the land subsidence along the Beijing-Xiong'an intercity railway.