Abstract

In this work, we exploit the integration of anadvanced synthetic aperture radar (SAR) interferometry techniqueand the application of the finite-element method for theassessment and the interpretation of a localized subsidence phenomenonthat took place within a specific area of Lisbon, Portugal.SAR images over the Lisbon city, covering different time intervalsin the period of 1995-2010, were acquired and processed bymeans of the persistent scatterers (PSs) technique. Results clearlyreveals a localized subsidence, limited to an area 2 km × 1.5 kmwide, which has been confirmed by the leveling performed in 1976,1996, and 2010. A physical interpretation of the observed grounddeformations is provided based on the results of a finite-elementmodel using stratigraphic data, in situ piezometric measurements,and geotechnical properties of the involved soils. The ground subsidenceis interpreted as the consequence of a consolidation processaffecting the central fine-grained soil layer, which in turn has beendriven by water withdrawal from the existing aquifers. The changeof the hydraulic boundary conditions was generated by the excavationworks for the construction of underground lines and alsoby the reduction of rainfall water infiltration as an effect of theincrease in ground surface impermeable areas due to urbanization.The consequent consolidation process of the compressiblefine-grained soil layer is supposed to provide a reasonable explanationof the observed time series of ground displacement in theexamined area.

Autore Pugliese

• Nico Giovanni

Tutti gli autori

• J. Catalao; G. Nico; P. Lollino; V. Conde; G. Lorusso; C. Silva

Titolo volume/Rivista

IEEE journal of selected topics in applied earth observations and remote sensing

Anno di pubblicazione

2015

ISSN

1939-1404

ISBN

Non Disponibile

Numero di citazioni Wos

Nessuna citazione

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Numero di citazioni Scopus

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Settori ERC

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Codici ASJC

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