Land Subsidence Situation by Ascending and Descending InSAR Interpretation after the Start of the South to North Water Transfer in the Beijing
-
摘要: 地下水长期超量开采引发的地面沉降是北京市面临的一个重大问题。我国南水北调中线工程通水以来，极大地缓解了北京市水资源短缺问题。针对南水北调中线工程对北京地面沉降影响的问题，本文利用升降轨时序合成孔径雷达干涉测量（Interferometric Synthetic Aperture Radar,InSAR）分析2014年12月至2020年12月南水北调中线工程通水后北京地面沉降发展态势。研究结果表明，北京市沉降分布不均匀，升轨形变速率及累计形变量最大分别为-134mm/a和-697mm，降轨形变速率及累计形变量最大分别为-135mm/a和-734mm。对比地下水位数据和抗差最小二乘拟合法融合的InSAR形变结果发现，北京地区的沉降速率随着地下水位的上升而逐渐减小，也即南水北调中线工程在一定程度上极大地缓解了北京的地面沉降扩张趋势。
-
关键词:
- 地面沉降 /
- 时序合成孔径雷达干涉测量 /
- 升降轨 /
- 抗差最小二乘拟合 /
- 内部互检
Abstract: Objectives: A major problem in Beijing is land subsidence caused by long-term over-exploitation of groundwater. Since the opening of the south-to-North Water Diversion Project, the problem of water shortage in Beijing has been greatly alleviated. The south-to-north Water Diversion Project alleviates the land subsidence in Beijing to a certain extent. Methods: In order to analyze the development trend of land subsidence after the start of the South to North Water Transfer in the Beijing, ascending and descending time series interferometric synthetic aperture radar(InSAR) technique is used to monitor land subsidence in Beijing. Firstly, the mean deformation velocity and cumulative deformation in line of sight (LOS) in Beijing district from January 2015 to December 2020 obtained by the small baseline subset InSAR(SBAS-InSAR). Secondly, The Robust least square fitting method were used to fuse the deformation results of the lifting rail and compare the global positioning system (GPS) monitoring datas and the fusion results of lifting rail. Finally, analyze the variation trend between the deformation results by the Robust least quadratic fitting and groundwater. Results: The deformation results show that the center of Beijing is basically stable and the deformation distribution is not uniform. The maximum ascending annual deformation velocity and the maximum ascending cumulative deformation amount reach -134mm/year and -697mm, the maximum descending annual deformation velocity and the maximum descending cumulative deformation amount reach -135mm/year and -734mm.And the fusion results obtained by the least square fitting method have certain reliability and accuracy. Conclusions: The subsidence rate in Beijing district shows a decreasing trend with the gradual increase of groundwater level. In general, the middle route of South-to-North Water Transfer Project has greatly alleviated the expansion trend of land subsidence in Beijing to a certain extent. -
[1] Poland M, Bürgmann R, Dzurisin D, et al.Constraints on the Mechanism of Long-Term, Steady Subsidence at Medicine Lake Volcano, Northern California, from GPS, Leveling, and InSAR[J].Journal of Volcanology and Geothermal Research, 2006, 150(1/2/3):55-78 [2] Ferretti A, Prati C, Rocca F.Nonlinear Subsidence Rate Estimation Using Permanent Scatterers in Differential SAR Interferometry[J].IEEE Transactions on Geoscience and Remote Sensing, 2000, 38(5):2202-2212 [3] Ferretti A, Prati C, Rocca F.Permanent Scatterers in SAR Interferometry[J].IEEE Transactions on Geoscience and Remote Sensing, 2001, 39(1):8-20 [4] Berardino P, Fornaro G, Lanari R, et al.A New Algorithm for Surface Deformation Monitoring Based on Small Baseline Differential SAR Interferograms[J].IEEE Transactions on Geoscience and Remote Sensing, 2002, 40(11):2375-2383 [5] Yang Y.Robust Estimation of Geodetic Datum Transformation[J].Journal of Geodesy, 1999, 73(5):268-274 -
点击查看大图
计量
- 文章访问数: 116
- HTML全文浏览量: 18
- PDF下载量: 17
- 被引次数: 0
下载:
