时序SBAS-InSAR下的香格里拉市地表形变监测

Surface Deformation Monitoring of Shangri⁃La Urban Area Based on Time Series SBAS-InSAR

利用SBAS-InSAR技术并结合Sentinel-1A降轨数据对香格里拉市建塘镇城区进行地表形变监测,发现建塘镇城区在2019年8月到2020年3月监测期间共形成5个明显形变区,分别是纳帕海抬升区、东环线抬升区、西景线沉降区、中心城区沉降区和香格里拉市机场沉降区.两处抬升区抬升速率分别为21.17 mm/a,22.12 mm/a;其中西景线沉降区沉降最明显,沉降速率为-16.97 mm/a.综合分析表明,大规模及快速的城市化建设和交通发展损坏了地层的平衡状态,从而导致城区地表形变.

Combined with Sentinel-1A orbit down data,SBAS-InSAR technology is used to monitor the surface deformation in the urban area of Jiantang town,Shangri-La city.The results show that during the monitoring period from August 2019 to March 2020,there are 5 obvious deformation areas in Shangri-La urban area,namely the Napa Sea uplift area,the East Ring up⁃lift area,the Xijing Line subsidence area,the central urban subsidence area and the Shangri-La airport subsidence area.The uplift rates of the two uplift areas are 21.17 mm/a and 22.12 mm/a respectively;the subsidence area of the Xijing Line has the most ob⁃vious subsidence,with a subsidence rate of-16.97 mm/a.Comprehensive analysis shows that large-scale and rapid urbanization construction and traffic development have damaged the equilibrium state of the stratum,resulting in the deformation of the urban surface.