时序InSAR技术与GIS结合监测地下水开采区地表沉降

Ground subsidence monitoring in water exploitation area based on time series InSAR and GIS

介绍了时序InSAR分析技术的优点与可行性。针对地下水过量开采导致的地表沉陷问题进行研究,利用17景时间跨度为2007—2010年的ENVISAT ASAR数据,采用IPTA时序处理与GIS空间分析相结合的手段对沧州地区的地表沉降进行直观而全面的分析,得到了该地区的累计沉降过程与平均沉降速率,同时对京杭运河段进行提取分析。结果表明:以城区为中心,与附近县形成一个较为明显的沉降漏斗的地势,城区表现相对稳定,沉降速率保持在4 mm/a以下,部分区域抬升,抬升速率不大。沧州市运河段贯穿沉降漏斗区域,中部地区较为稳定,北部与南部地区下沉且沉降速率在20 mm/a左右。

The surface subsidence caused by excessive exploitation of groundwater is studied. This paper analyzes the deformation sequences and the average deformation rate of the study area from 17 ENVISAT ASAR images collected from 2007 to 2010,using the IPTA technology and GIS to make a comprehensive analysis. By analyzing the deformation result of the study area and the Grand Canal segment,it can be concluded that a significant ground subsidence funnel is formed which the city is the center. In the urban area,the subsidence rate is relatively stable and the subsidence rates below 4 mm/a,but some uplifting rate is small. The Grand Canal segment in Cangzhou runs through the ground subsidence funnel. The subsidence in the Grand Canal segment is obviously,particularly in the northern and southern regions where the rate of settlement is around 20 mm/a,but the the central region is relatively stable.