Long-Term Land Subsidence Monitoring of Beijing (China) Using the Small Baseline Subset (SBAS) Technique
Long-Term Land Subsidence Monitoring of Beijing (China) Using the Small Baseline Subset (SBAS) Technique
复制标题
使用小基线子集 (SBAS) 技术对北京（中国）进行长期地面沉降监测
DOI：
10.3390/rs6053648
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发表时间：
2014-05-01
期刊：
影响因子：
5
通讯作者：
Liang, Jun
中科院分区：
文献类型：
--
作者：
Hu, Bo;Wang, Han-Sheng;Liang, Jun
先进的多时相InSAR （MT-InSAR）技术是地面沉降研究中的一种有价值的工具，通过使用覆盖同一区域的不同时期的大型SAR图像数据集，可以远程调查长时间间隔的物体运动行为。北京容易下沉，对环境造成不良影响，并影响人口密集。地下水的过度开采被认为是地面沉降的主要原因，而快速的城市化和经济发展、摩天大楼、高速公路和地下工程设施（如地铁）的大规模建设也是造成地面沉降的因素。本文利用MT-InSAR技术中的小基线子集（Small Baseline子集，SBAS）对北京市地面沉降进行了时空分析。该技术允许监测变形现象的时间演变，通过从获取的SAR图像数据集生成平均变形速度图和位移时间序列。利用2003年6月至2010年8月期间获得的52张c波段ENVISAT ASAR图像，生成了线性变形率图，并得出了地面变形的时间序列。结果表明：研究区内存在3个大型沉降漏斗，分别位于朝阳区八里庄—大角亭、朝阳区望京—来广营、高立营—顺义区。京快沿线的最大聚落中心为王四至通州；LOS方向沉降速度超过110 mm/y。特别地，我们将实现的结果与假设作为参考的水平测量进行了比较。基于SBAS方法的长期沉降估算结果与地下水过度开采的发展趋势吻合较好，表明SBAS技术可以很好地从多时相SAR数据中反演北京市地面沉降。
Advanced techniques of multi-temporal InSAR (MT-InSAR) represent a valuable tool in ground subsidence studies allowing remote investigation of the behavior of mass movements in long time intervals by using large datasets of SAR images covering the same area and acquired at different epochs. Beijing is susceptible to subsidence, producing undesirable environmental impacts and affecting dense population. Excessive groundwater withdrawal is thought to be the primary cause of land subsidence, and rapid urbanization and economic development, mass construction of skyscrapers, highways and underground engineering facilities (e.g., subway) are also contributing factors. In this paper, a spatial–temporal analysis of the land subsidence in Beijing was performed using one of the MT-InSAR techniques, referred to as Small Baseline Subset (SBAS). This technique allows monitoring the temporal evolution of a deformation phenomenon, via the generation of mean deformation velocity maps and displacement time series from a data set of acquired SAR images. 52 C-band ENVISAT ASAR images acquired from June 2003 to August 2010 were used to produce a linear deformation rate map and to derive time series of ground deformation. The results show that there are three large subsidence funnels within this study area, which separately located in Balizhuang-Dajiaoting in Chaoyang district, Wangjing-Laiguangying Chaoyang district, Gaoliying Shunyi district. The maximum settlement center is Wangsiying-Tongzhou along the Beijing express; the subsidence velocity exceeds 110 mm/y in the LOS direction. In particular, we compared the achieved results with leveling measurements that are assumed as reference. The estimated long-term subsidence results obtained by SBAS approach agree well with the development of the over-exploitation of ground water, indicating that SBAS techniques is adequate for the retrieval of land subsidence in Beijing from multi-temporal SAR data.