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首页> 外文期刊>GIScience & remote sensing >Change in regional land subsidence in Beijing after south-to-north water diversion project observed using satellite radar interferometry
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Change in regional land subsidence in Beijing after south-to-north water diversion project observed using satellite radar interferometry

机译：利用卫星雷达干涉仪观测南水北调工程后北京区域地面沉降的变化

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摘要

Over-exploitation of groundwater has caused severe land subsidence in Beijing during the past two decades. Since the middle route of South-to-North Water Diversion Project (SNWDP), the biggest water diversion project in China, started to deliver water to Beijing in December 2014, the groundwater shortage has been greatly alleviated. This study aims to analyze the impact of SNWDP on the spatiotemporal evolution of land subsidence in Beijing. Change in surface displacement in Beijing after SNWDP was retrieved and the spatiotemporal patterns of the change were analyzed based on long time-series Envisat Advanced Synthetic Aperture Radar (ASAR) (2004-2010), Radarsat-2 (2011-2014), and Sentinel-1 (2015-2017) satellite datasets using Permanent Scatterer Interferometric Synthetic Aperture Radar (PS-InSAR) techniques. Land subsidence unevenness index (LSUI) was proposed to represent the spatial unevenness of surface displacement. PS-Time approach was then adapted to examine the time series evolution of LSUI. The results showed that the InSAR measurements agree well with leveling measurements with R-2 over 0.96. Although the maximum annual displacement rate reached -159.7 mm/year by 2017, over 57% of the area within 25 mm/year contour line showed decreasing or unchanged displacement rate after the south-north water delivered to Beijing. The settlement rate in Chaoyang-Dongbalizhuang (CD) subsidence center has decreased for 26 mm/year from 2011-2014 to 2015-2017. Only around 15% of the area experienced continued accelerating settlement rate through the three time periods, which was mainly located in the area with the compressible layer thickness over 190 m, while the magnitude of velocity increment considerably decreased after SNWDP. Land subsidence unevenness, represented by LSUI, developed more slowly after SNWDP than that during 2011-2014. However, LSUI at the edge of settlement funnel has kept developing and reached 1.7 parts per thousand in 2017. Decreasing groundwater level decline after SNWDP and the positive relationship (R-2 > 0.74) between land subsidence and groundwater level clearly showed impacts of SNWDP on the alleviating land subsidence. Other reasons include geological background, increasing precipitation, and strict water management policies implemented during these years.
机译：在过去的二十年中，地下水的过度开采在北京造成了严重的地面沉降。自中国最大的引水工程南水北调中线（SNWDP）于2014年12月开始向北京输送水源以来，地下水短缺得到了极大缓解。本研究旨在分析SNWDP对北京土地沉降时空演变的影响。检索SNWDP后北京的地表位移变化并基于长时间序列的Envisat先进合成孔径雷达（ASAR）（2004-2010），Radarsat-2（2011-2014）和Sentinel分析了时空变化-1（2015-2017）卫星数据集，使用永久散射体干涉合成孔径雷达（PS-InSAR）技术。提出了地面沉降不均匀指数（LSUI）来表示地表位移的空间不均匀性。然后将PS-Time方法修改为检查LSUI的时间序列演变。结果表明，InSAR测量值与R-2超过0.96的水平测量值非常吻合。尽管到2017年最大年排水量达到-159.7毫米/年，但从南北向北京输送水后，在25毫米/年等高线内超过57％的区域显示排水量减少或保持不变。从2011-2014年到2015-2017年，朝阳-东八里庄（CD）沉降中心的沉降率下降了26毫米/年。在三个时间段中，只有约15％的区域经历了持续加速的沉降速率，这主要位于可压缩层厚度超过190 m的区域，而SNWDP后速度增量的幅度却大大降低了。在SNWDP之后，以LSUI为代表的地面沉降不均比2011-2014年期间发展缓慢。但是，沉降漏斗边缘的LSUI一直在发展，2017年达到千分之1.7。SNWDP后地下水位下降的减少以及地面沉降与地下水位之间的正相关关系（R-2> 0.74）清楚地表明了SNWDP对地下水的影响。减轻土地沉降。其他原因包括这些年来的地质背景，降水增加以及严格的水管理政策。

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  • 来源
    《GIScience & remote sensing》 |2020年第2期|140-156|共17页
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  • 作者单位

    Capital Normal Univ Coll Resources Environm & Tourism Beijing Peoples R China|Capital Normal Univ Base State Key Lab Urban Environm Proc & Digital Beijing Peoples R China;

    Capital Normal Univ Coll Resources Environm & Tourism Beijing Peoples R China|Capital Normal Univ Base State Key Lab Urban Environm Proc & Digital Beijing Peoples R China|Capital Normal Univ Beijing Lab Water Resources Secur State Key Lab Incubat Base Urban Environm Proc & Beijing Peoples R China;

    Univ Athens Dept Environm Phys & Meteorol Athens Greece;

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  • 正文语种 eng
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  • 关键词

    South-north water diversion project; envisat ASAR; radarsat-2; sentinel-1; PS-InSAR;

    机译：南北调水工程;设想ASAR;Radarsat-2;哨兵1;PS-InSAR;

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