利用SBAS-InSAR技术监测北京地面沉降

Monitoring land subsidence in Beijing based on SBAS-InSAR technology

以新水情下北京地区作为研究对象,用2019年12月24日至2021年8月27日的52景Sentinel-1数据,采用SBAS-InSAR技术提取地面沉降信息。详细分析了沉降区域的空间分布特征及典型地区沉降演化过程,根据危险性分区量化指标对地面沉降危险性进行了初步研究,结果表明:北京地区地面沉降空间分布呈现明显的不均匀、不规则、漏斗式的运动特征,形成4个明显的沉降漏斗区(通州沉降区、朝阳金盏沉降区、海淀稻香湖公园沉降区、大兴机场周边沉降区)。北京朝阳金盏和高安屯地区的地表形变速率较大,均超过了-120 mm/a。严重沉降区、较严重和一般沉降区主要位于4个沉降漏斗区,面积占比约6.2%,值得重点关注,其他区域地面沉降危险性较低。

Taking Beijing under the new water regime as the research object,52 Sentinel-1 data from December 24,2019 to August 27,2021 were used to extract land subsidence information using SBAS-InSAR technology.A detailed analysis of the spatial distribution characteristics of subsidence areas and the evolution process of typical subsidence areas was conducted.Based on quantitative indicators of hazard zoning,the risk of land subsidence was preliminarily studied.The results indicated that the spatial distribution of land subsidence in Beijing showed obvious uneven,irregular,and funnel-shaped motion characteristics,forming four distinct subsidence funnel zones(Tongzhou subsidence zone,Chaoyang Jinzhan subsidence zone,Haidian Daoxianghu Park subsidence zone,and the surrounding subsidence zone of Daxing Airport).The surface deformation rates in Jinzhan and Gao’antun areas of Chaoyang,Beijing,are relatively high,both exceeding-120 mm/a.The severe subsidence zones,relatively severe zones,and general severe zones are mainly located in four subsidence funnel zones,accounting for about 6.2%,which is worthy of special attention.The risk of land subsidence in other areas is relatively low.