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首页> 外文期刊>Selected Topics in Applied Earth Observations and Remote Sensing, IEEE Journal of >Integration of InSAR Analysis and Numerical Modeling for the Assessment of Ground Subsidence in the City of Lisbon, Portugal
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Integration of InSAR Analysis and Numerical Modeling for the Assessment of Ground Subsidence in the City of Lisbon, Portugal

机译：InSAR分析与数值模型的集成，用于评估葡萄牙里斯本市的地面沉降

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摘要

In this work, we exploit the integration of an advanced synthetic aperture radar (SAR) interferometry technique and the application of the finite-element method for the assessment and the interpretation of a localized subsidence phenomenon that took place within a specific area of Lisbon, Portugal. SAR images over the Lisbon city, covering different time intervals in the period of 1995–2010, were acquired and processed by means of the persistent scatterers (PSs) technique. Results clearly reveals a localized subsidence, limited to an area wide, which has been confirmed by the leveling performed in 1976, 1996, and 2010. A physical interpretation of the observed ground deformations is provided based on the results of a finite-element model using stratigraphic data, piezometric measurements, and geotechnical properties of the involved soils. The ground subsidence is interpreted as the consequence of a consolidation process affecting the central fine-grained soil layer, which in turn has been driven by water withdrawal from the existing aquifers. The change of the hydraulic boundary conditions was generated by the excavation works for the construction of underground lines and also by the reduction of rainfall water infiltration as an effect of the increase in ground surface impermeable areas due to urbanization. The consequent consolidation process of the compressible fine-grained soil layer is supposed to provide a reasonable explanation of the observed time series of ground displacement in the examined area.
机译：在这项工作中，我们利用先进的合成孔径雷达（SAR）干涉测量技术的集成以及有限元方法的应用来评估和解释在葡萄牙里斯本特定地区发生的局部沉降现象。通过持续散射（PSs）技术获取并处理了涵盖1995-2010年期间不同时间间隔的里斯本市的SAR图像。结果清楚地表明了局部沉降，该沉降仅限于整个区域，这一点已在1976、1996和2010年进行的水准测量中得到了证实。基于有限元模型的结果，使用以下方法对观测到的地面变形进行了物理解释：所涉及土壤的地层数据，测压测量和岩土特性。地面沉降被解释为固结过程影响中央细粒土层的结果，而固结细粒土层又是由现有含水层的取水驱动的。水力边界条件的变化是由地下管线的开挖工程引起的，也是由于城市化导致地表不可渗透面积增加的影响，雨水渗透的减少。因此，可压缩细粒土层的固结过程可以合理解释观察区域内地面位移的时间序列。

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