摘要
选用27景覆盖天津市主城区的Sentinel-1A SAR数据,采用短基线InSAR技术获取研究区域2020年高精度地面沉降监测信息。经与水准实测数据对比分析,共识别32对水准-InSAR同名点,两者整体偏差均方根为5.15 mm。根据研究区沉降速率分布情况,进一步筛选静海区团泊镇、津南区八里台镇及东丽区机场区域作为重点区域,分别绘制其时序沉降图,可知上述区域沉降整体呈线性趋势,最大沉降发生在静海区,其沉降速率超过80 mm/a。最后绘制选定区域走向线的剖面图,提取非均匀沉降特殊点位信息,为其建筑物高精度沉降稳定性监测提供参考数据。
By Selecting 27 sceneries of Sentinel-1A Satellite SAR Imagery covering Tianjin’s main urban area,and using the SBAS-InSAR(small baseline subset,InSAR)was obtained high-precision ground subsidence monitoring information of the study area in 2020.Through comparing with the Leveling data,a total of 32 pairs of leveling-InSAR’s same name points(SNPs)were identified,and the overall deviation between the double kinds of results was 5.15mm.Basing on the distribution of subsidence rate in the study area,the Tuanbo Town,Jinghai District,Balitai Town,Jinnan District and Dongli District airport were as considered as the key areas,with the time-series subsidence diagrams drawn respectively.From above results,it showed that the linear subsidence trend in the above areas,and the largest cumulative subsidence occurred in Jinghai District,where the maximum subsidence rate was more than 80mm/a.Finally,by drawing the profile of the trend-line in the selected areas,the information of special points of non-uniform subsidence was acquired,which used to provide high-precision reference data for monitoring subsidence stability of building.
作者
周洪月
易长荣
周鑫
张志全
ZHOU Hongyue;YI Changrong;ZHOU Xin;ZHANG Zhiquan(Tianjin Institute of Surveying and Mapping Co.,Ltd.,Tianjin 300381,China;Tianjin Geological Affairs Center,Tianjin 300381,China)
出处
《城市勘测》
2023年第3期66-70,共5页
Urban Geotechnical Investigation & Surveying
基金
国家自然科学基金(51574221)
天津市规划和自然资源局2021年天津市地面沉降综合防治专项(BTZB-HP2021-018)
天津市基岩标高程稳定性监测与评估技术研究(20211203)
天津市立体化地面沉降监测技术研究(20211206)。
