基于干涉点目标技术的地面沉降监测应用研究

Research of Ground Subsidence Monitoring Based on Interferometric Point Target Analysis

选取覆盖广州地区的29景ENVISAT/ASAR影像,基于干涉点目标技术(Interferometric Point Target Analysis,IPTA)提取了广州地区的地表形变结果,并对结果进行了分析与讨论。通过对4个沉降现象明显地区以及相应沉降严重地段的分析可知,广州地区地面沉降的发生由两种因素导致,一是该地区独特丰富的水文地质构造条件;二是设施建设、工业生产、经济发展等人类活动使该地土壤负载力增加,地下水需求与开采加剧,从而在多处地段呈现出不同程度的地面沉降现象。

In this paper,We acquired subsidence velocity map of Guangzhou using Interferometric Point Target Analysis(IPTA) technique with 29 scenes of ENVISAT/ASAR images collected between 2010 and 2013. The results show that ground subsidence mainly occurs in the area along rivers,commercial centers and industrial plants.Based on the analysis of4 regions with obvious subsidence and corresponding point targets,we conclude two major factors leading to such phenomenon,one is a variety of hydrogeological conditions of such area; the other is the increased soil loading capacity and groundwater exploitation induced by human activities like facilities construction,industrial production,economic development,etc.