短时空基线PS-InSAR在北京地面沉降监测中的应用

Application of small spatio-temporal baseline PS-InSAR to the study of land subsidence in Beijing

短时空基线PS-InSAR采用同时控制时间基线和垂直基线的方法,在一定程度上避免了时空失相关问题。文中采用短时空基线PS-InSAR的方法监测北京区域地面沉降,分析了区域地面沉降中的时间序列演化特征,以及抽取地下水、断裂带对地面沉降的影响。结果发现时间序列上的地面沉降存在明显的季节性变化特征,抽取地下水作为导致地面沉降的主要原因,在一定程度上还取决于断裂带的影响,地面沉降中心区域并没有完全与地下水漏斗吻合,这可能与可压缩土层的厚度有关。

Small spatio-temporal baseline PS-InSAR technology controls the time baseline and the vertical baseline at the same time to avoid the loss of time and space related issues to a certain extent. This article uses the small spatio-temporal baseline PS-InSAR method to monitor land subsidence in the Beijing region, analyzes regional land subsidence in the evolution of time series and the impact of extraction of groundwater, and the fault zone to land subsidence. The results show that the ground subsidence in time series has a clear seasonal variation, reflecting the extraction of groundwater as the main reason leading to land subsidence. The ground subsidence also depends on the impact of faults. The central area of surface subsidence and depression cone of groundwater level are not completely match, which may has a close relationship with the thickness of the compressible soil.