摘要
南水北调项目的开通,使北京市的用水结构发生明显改变,北京平原地区的地下水开采量相对减少.本文旨在利用时序InSAR技术对覆盖北京平原地区的升轨Sentinel-1A数据进行处理,分析南水进京后北京平原地区地面沉降的变化特征.结果表明:(1)2017年5月到2019年12月北京朝阳地区与通州地区的最大年沉降速率分别为115 mm/a和120 mm/a,相比于南水进京前,最大年沉降速率得到一定程度的缓解;(2)大兴区南部地区沉降速率比北部地区快30~50 mm/a;(3)石景山东部、丰台区西部等地区略有地面抬升现象,约为0~15 mm/a;(4)地面沉降速率较高地区与地质灾害高易发区吻合性达到80%以上,表明研究区内地面沉降可能成为导致地质灾害的主要诱因.总体而言,随着地下水位的逐渐上升,北京平原地区的地面沉降速率呈现逐渐减少的趋势.
Since the opening of the south-to-North Water Diversion Project(SWDP),the structure of water consumption in Beijing has been changed evidently.Groundwater exploitation has been reduced after the start of the South to North Water Transfer in the Beijing plain.The purpose of this paper is to study the spatiotemporal feature of land subsidence in Beijing plain after the South-to-North Water Diversion Project(SWDP)by using ascending-track Sentinel-1 A data from 2017 to 2019 with multi-temporal InSAR technique.The results show that:(1)The maximum annual subsidence rates of Changyang District and Tongzhou District reach 115 mm/a and 120 mm/a from May 2017 to December 2019,respectively.Compared with that before the South-to-North Water Diversion Project(SWDP),the maximum annual subsidence rates in both areas are alleviated to some extent.(2)The subsidence rate in the southern part of Daxing district is faster than that in the northern part with the rate of 30~50 mm/a;(3)The eastern part of Shijingshan and the western part of Fengtai District show a slight uplift,with the rate of about 0~15 mm/a;(4)The coincidence between the area with high land subsidence rate and the area with high risk of geological disasters reaches 80%,which indicates that the land subsidence may be the main cause of geological disasters in the study area.In general,the subsidence rate in Beijing plain shows a decreasing trend with the gradual increase of groundwater level.
作者
晏霞
刘媛媛
赵振宇
YAN Xia;LIU YuanYuan;ZHAO ZhenYu(Key Laboratory for Digital land and Resources of Jiangxi Province,East China University of Technology,Nanchang 330013,China;Faculty of Geomatics,East China University of Technology,Nanchang 330013,China)
出处
《地球物理学进展》
CSCD
北大核心
2021年第6期2351-2361,共11页
Progress in Geophysics
基金
国家自然科学基金(42104030)
江西省自然科学基金(20202BABL212016)
东华理工大学江西省数字国土重点实验室开放研究基金资助项目(DLLJ202013)
东华理工大学博士科研启动基金(DHBK2018004)联合资助。
