利用InSAR分析陕西省垂直形变  

Analysis of Vertical Deformation with InSAR in Shaanxi Province

作　　者：杨宏山 聂建亮 YANG Hongshan;NIE Jianliang(Shaanxi Bureau of Surveying,Mapping and Geoinformation,Xi’an 710054,China;Geodetic Data Processing Center of Ministry of Natural Resources,Xi’an 710054,China)

机构地区：[1]陕西测绘地理信息局,陕西西安710054 [2]自然资源部大地测量数据处理中心,陕西西安710054

出　　处：《武汉大学学报（信息科学版）》2023年第5期710-716,共7页Geomatics and Information Science of Wuhan University

基　　金：国家自然科学基金(41774004,41904040);陕西测绘地理信息局科技创新项目(2020-11)。

摘　　要：从2018—2019年欧空局Sentinel-1免费数据中获取陕西省全域垂直形变面状信息,并将其与全球导航卫星系统(global navigation satellite system,GNSS)以及水准点、线垂直形变信息进行对比分析,进一步验证合成孔径雷达干涉测量(interferometric synthetic aperture radar,InSAR)数据反映局部形变的有效性。垂直形变监测结果表明:在陕北榆林、神木地区,地下资源开采诱发的地表沉陷分布广泛、特征明显,地表沉陷速度达60 mm/a;在煤炭产区长武、彬县也出现不同程度的开采沉陷灾害,沉降速度达30 mm/a;西安市、渭南市等关中平原地区由于地下水开采出现不均匀沉降,其中,西安市的局部沉降最为严重,最大沉降速度达60 mm/a;InSAR与GNSS、水准获取的垂直运动趋势在全省范围总体上一致,但由于GNSS监测点、水准监测点一般布测在较稳定区域,其获取的沉降范围、沉降速度与InSAR沉降结果有一定差异。Objectives:To prove the effectiveness of interferometric synthetic aperture radar(InSAR)data in describing the deformation in the local area,the vertical deformation surface information of Shaanxi Province is obtained with Sentinel-1 free data of European Space Agency from 2018 to 2019.Methods:The information is compared with the point and line vertical deformation information from the global navigation satellite system(GNSS)and the level.Results:The results of vertical deformation monitoring show that the uneven subsidence with the maximum velocity of 60 mm/a occurred in the local mining areas of Yulin and Shenmu where the subsidence of surface widely distributed and have obvious characteristics.There are also subsidence with the velocity of 30 mm/a in Changwu and Binxian where the coal has been roughly mined for long time.Uneven subsidence occurs in Xi’an,Weinan of Guanzhong Plain due to excessive groundwater exploitation.The subsidence of local area in Xi’an is the most serious,with the maximum velocity of 60 mm/a.Conclusions:The vertical movement trends of InSAR are consistent with the results of GNSS and level in Shaanxi Province on the whole,however the GNSS monitoring points and the level monitoring points are generally deployed in the stable areas,the subsidence range and subsidence velocity obtained by them are somewhat different from the subsidence results obtained by InSAR.

关 键 词：垂直形变 地质灾害 合成孔径雷达干涉测量 地面沉降 

分 类 号：P227[天文地球—大地测量学与测量工程] P237[天文地球—测绘科学与技术]