新水情背景下北京平原朝阳—通州沉降区地面沉降特征及其影响  

Land Subsidence Characteristics and Impact in Chaoyang-Tongzhou Area of Beijing Plain Under New Hydrological Background

作　　者：韩红闪 朱琳[1,2,3,4,5] 郭高轩[6] 李炳华[7] 卢灿 Han Hongshan;Zhu Lin;Guo Gaoxuan;Li Binghua;Lu Can(College of Resource Environment and Tourism,Capital Normal University,Beijing 100048,China;Laboratory Cultivation Base of Environment Process and Digital Simulation,Capital Normal University,Beijing 100048,China;Beijing Laboratory of Water Resources Security,Capital Normal University,Beijing 100048,China;Key Laboratory of Land Subsidence Mechanism,Prevention and Control(Capital Normal University),Ministry of Education,Beijing 100048,China;Hebei Cangzhou Groundwater and Land Subsidence National Observation and Research Station,Cangzhou 061000,Hebei,China;Beijing Institute of Geo-Environment Monitoring,Beijing 100195,China;Beijing Water Science and Technology Institute,Beijing 100048,China)

机构地区：[1]首都师范大学资源环境与旅游学院,北京100048 [2]首都师范大学城市环境过程和数字模拟国家重点实验室培育基地,北京100048 [3]首都师范大学水资源安全北京实验室,北京100048 [4]地面沉降机理与防控教育部重点实验室(首都师范大学),北京100048 [5]河北沧州平原区地下水与地面沉降国家野外科学观测研究站,河北沧州061000 [6]北京市地质环境监测所,北京100195 [7]北京市水科学技术研究院,北京100048

出　　处：《吉林大学学报（地球科学版）》2024年第4期1326-1338,共13页Journal of Jilin University：Earth Science Edition

基　　金：国家自然科学基金项目(42271082)。

摘　　要：地面沉降是北京地区突出的地质灾害,严重威胁经济、环境和社会的可持续发展。为了研究地面沉降的时空特征及其影响,本文以北京平原朝阳—通州沉降区为研究对象,先基于Sentinel-1 A/B卫星降轨数据,利用PS-InSAR(persistent scatters InSAR)技术获取了研究区2019年1月—2021年12月地面沉降特征,再采用动态时间规整(DTW)算法定量分析了地面沉降与不同层位地下水位之间的响应关系,并进一步量化了不同深度地下水抽取诱发地面沉降的贡献率。结果表明:1)2019—2021年朝阳—通州地区地面沉降连片发展,年均沉降速率超过50 mm/a的沉降严重地区主要分布在朝阳区东部和通州区北部,其中最大沉降速率达到91 mm/a。2)朝阳—通州地区可压缩层厚度区域分布差异,为地面沉降的发生与发展提供了有利的地质条件。整体上来看可压缩层厚度大小与地面沉降速率成正比,研究区地面沉降速率大于80 mm/a的永久散射体(PS)点所在位置处的可压缩层厚度均大于180 m,且主要处于可压缩层厚度200~220 m的地区。3)地面沉降与不同层位地下水位时间序列响应不同,埋深为50~180 m的承压含水层水位与地面沉降响应程度相对较高,其中92.00和121.42 m深度下地下水位与地面沉降时序的响应程度最高,反映出该层位的地下水位变化是造成沉降的主要诱发因素。Land subsidence is a prominent geological hazard in the Beijing area,posing a serious threat to the sustainable development of the economy,environment and society.This paper takes the Chaoyang-Tongzhou area,which is a severely subsiding region of the Beijing Plain,as the research object.Based on Sentinel-1 A/B satellite track data and using PS-InSAR(persistent scatters InSAR)technology,the characteristics of land subsidence in the study area from 2019 to 2021 was obtained.The dynamic time warping(DTW)algorithm was used to quantitatively analyze the response relationship between land subsidence and groundwater levels at different depths,and then the contribution rate of groundwater at different depths to subsidence was quantified.The results show as follows:1)From 2019 to 2021,land subsidence in the Chaoyang-Tongzhou area developed continuously.The most severe subsidence areas with an annual subsidence rate exceeding 50 mm/a were mainly distributed in the east of Chaoyang and the north of Tongzhou,and the maximum subsidence rate of 91 mm/a.2)The difference in regional distribution of compressible layer thickness in the Chaoyang-Tongzhou area provids favorable geological conditions for the occurrence and development of land subsidence.On the whole,the thickness of the compressible layer is positively proportional to the land subsidence rate.The thickness of compressible layer at the location of PS points with a land subsidence rate greater than 80 mm/a in the study area was greater than 180 m,mainly in areas with a compressible layer thickness of 200-220 m.3)Land subsidence responds differently to groundwater level time series at different depths.The water level in the confined aquifer with a burial depth of 50-180 m has a relatively high response degree to land subsidence,with the groundwater level at depths of 92.00 m and 121.42 m showing the highest response degree to land subsidence time series,reflecting that the groundwater level changes at this depth are the main inducing factors for subsidence.

关 键 词：地面沉降 PS-INSAR DTW 朝阳—通州 地下水位 影响因素 北京 

分 类 号：P642.26[天文地球—工程地质学]