The area study over Tianjin of China use Permanent ScatteresInSAR (PSInSAR) technique for subsidence monitoring via 23 Sentinel-1A satellite IW mode images.The deformation rate of subsiding areas from 2015-05 to 2016-02 is reconstructed.The timing deformation characteristics and causes of key subsidence area are analyzed in detail.The experimental results show that the serious subsidence areas are mainly focus on the region of Beichen district and Dasi town.Based on the deformation rate of Beichen district and the drawdown funnel contour map of the second and third confined aquifer group,it is found that the ground subsidence center and the underground water funnel are grossly consistent,which shows the overall shift with the northeast trend.The dominant cause of subsidence areas may be the overexploitation of groundwater.%利用2015-05-2016-02获取的天津地区23景哨兵-1A(Sentinel-1A)卫星IW模式影像,进行基于地面散射特性保持稳定的高相干点永久散射体干涉测量处理(PSInSAR),获取了地面沉降速率,分析了重点沉降区域时序形变特征和成因.实验结果表明,天津地区沉降严重区域主要集中在北辰区和大寺镇,结合北辰区沉降速率图和第2、3承压含水组水位降落漏斗等值线图,分析发现地面沉降中心和地下水位漏斗大致吻合,呈现整体向东北方向偏移的趋势,得出造成地面沉降的主导因素可能为超量开采地下水的结论.
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