Imaging Land Subsidence Induced by Groundwater Extraction in Beijing (China) Using Satellite Radar Interferometry
Imaging Land Subsidence Induced by Groundwater Extraction in Beijing (China) Using Satellite Radar Interferometry
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DOI：
10.3390/rs8060468
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发表时间：
2016-06-01
期刊：
影响因子：
5
通讯作者：
Gong, Xulong
中科院分区：
文献类型：
--
作者：
Chen, Mi;Tomas, Roberto;Gong, Xulong
北京是世界上用水最紧张的城市之一。由于过度开采地下水，北京地区自1935年以来一直遭受地面沉降。利用小基线干涉合成孔径雷达（InSAR）技术对2003 - 2010年的Envisat ASAR图像和2010 - 2011年的TerraSAR-X条带图像进行处理，研究北京地区地面沉降。北京东部地区沉降最大，沉降速率大于100 mm/a。比较干涉合成孔径雷达和全球定位系统得出的沉降速率，RMS差异为2.94毫米/年，平均值为2.41 +/- 1.84毫米/年。此外，从两个不同的数据集（即，Envisat和TerraSAR-X）。这再次证明了干涉合成孔径雷达是监测地面沉降的有力工具。通过干涉合成孔径雷达绘制的沉降率图，可以进行全面的时空分析，以确定地面沉降的主要触发因素。地面沉降与地下水位、活断层、软土厚度和含水层类型之间存在着一些有趣的关系。此外，在这项工作中还认识到与抽威尔斯的距离的关系。
Beijing is one of the most water-stressed cities in the world. Due to over-exploitation of groundwater, the Beijing region has been suffering from land subsidence since 1935. In this study, the Small Baseline InSAR technique has been employed to process Envisat ASAR images acquired between 2003 and 2010 and TerraSAR-X stripmap images collected from 2010 to 2011 to investigate land subsidence in the Beijing region. The maximum subsidence is seen in the eastern part of Beijing with a rate greater than 100 mm/year. Comparisons between InSAR and GPS derived subsidence rates show an RMS difference of 2.94 mm/year with a mean of 2.41 +/- 1.84 mm/year. In addition, a high correlation was observed between InSAR subsidence rate maps derived from two different datasets (i.e., Envisat and TerraSAR-X). These demonstrate once again that InSAR is a powerful tool for monitoring land subsidence. InSAR derived subsidence rate maps have allowed for a comprehensive spatio-temporal analysis to identify the main triggering factors of land subsidence. Some interesting relationships in terms of land subsidence were found with groundwater level, active faults, accumulated soft soil thickness and different aquifer types. Furthermore, a relationship with the distances to pumping wells was also recognized in this work.