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首页> 外文期刊>Journal of geodynamics >Complex surface deformation monitoring and mechanism inversion over Qingxu-Jiaocheng, China with multi-sensor SAR images
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Complex surface deformation monitoring and mechanism inversion over Qingxu-Jiaocheng, China with multi-sensor SAR images

机译：利用多传感器SAR图像对清徐交城地区复杂地表变形进行监测和机理反演

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摘要

Qingxu-Jiaocheng, China has been suffering severe land subsidence along with the development of ground fissure, which are controlled by local fault and triggered by groundwater withdrawal. With multi-sensor SAR images, we study the spatiotemporal evolution of ground deformation over Qingxu-Jiaocheng with an IPTA InSAR technique and assess the role of groundwater withdrawal to the observed deformation. Discrete GPS measurements are applied to verify the InSAR results. The RMSE of the differences between InSAR and GPS, i.e. ALOS and GPS and Envisat and GPS, are 5.7 mm and 6.3 mm in the LOS direction, respectively. The east-west and vertical components of the observed deformation from 2007 to 2010 are decomposed by using descending track Envisat and ascending-track ALOS interferograms, indicating that the east-west component cannot be neglected when the deformation is large or the ground fissure is active. Four phases of land subsidence in the study region are successfully retrieved, and its spatiotemporal evolution is quantitatively analyzed. Lastly, a flat lying sill model with distributed contractions is implemented to model the InSAR deformation over Qingxu-Jiaocheng, which manifests that the ground deformation is mainly caused by groundwater withdrawal. This research provides new insights into the land subsidence monitoring and its mechanism inversion over Qingxu-Jiaocheng region.
机译：随着地面裂隙的发展，中国的清徐—交城经历了严重的地面沉降，地面裂隙是由局部断层控制并由地下水抽取触发的。利用多传感器SAR图像，我们利用IPTA InSAR技术研究了清徐—交城地区地面变形的时空演化，并评估了地下水抽取对观测到的变形的作用。应用离散GPS测量来验证InSAR结果。 InSAR和GPS之间的差异（即ALOS和GPS和Envisat和GPS）之间的均方根误差（RMSE）在LOS方向分别为5.7 mm和6.3 mm。使用下降轨道Envisat和上升轨道ALOS干涉图分解了2007年至2010年观测到的变形的东西向分量和垂直分量，这表明当变形较大或地裂缝活动时，东西向分量不能被忽略。成功地提取了研究区域的四个阶段的地面沉降，并对其时空演化进行了定量分析。最后，采用平分布的收缩基石模型，对清徐—交城地区的InSAR变形进行了模拟，结果表明地面变形主要是由地下水抽取引起的。该研究为清徐—交城地区的地面沉降监测及其机理反演提供了新的见解。

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