Assessment of Urban Subsidence in the Lisbon Metropolitan Area (Central-West of Portugal) Applying Sentinel-1 SAR Dataset and Active Deformation Areas Procedure
Por:
Cuervas-Mons, J, Zêzere, JL, Domínguez-Cuesta, MJ, Barra, A, Reyes-Carmona, C, Monserrat, O, Oliveira, SC, Melo, R
Publicada:
1 ago 2022
Categoría:
Earth and planetary sciences (miscellaneous)
Resumen:
The Lisbon metropolitan area (LMA, central-west of Portugal) has been severely affected by different geohazards (flooding episodes, landslides, subsidence, and earthquakes) that have generated considerable damage to properties and infrastructures, in the order of millions of euros per year. This study is focused on the analysis of subsidence, as related to urban and industrial activity. Utilizing the A-DInSAR dataset and applying active deformation areas (ADA) processing at the regional scale has allowed us to perform a detailed analysis of subsidence phenomena in the LMA. The dataset consisted of 48 ascending and 61 descending SAR IW-SLC images acquired by the Sentinel-1 A satellite between January 2018 and April 2020. The line-of-sight (LOS), mean deformation velocity (VLOS) maps (mm year(-1)), and deformation time series (mm) were obtained via the Geohazard Exploitation Platform service of the European Space Agency. The maximum VLOS detected, with ascending and descending datasets, were -38.0 and -32.2 mm year(-1), respectively. ADA processing over the LMA allowed for 592 ascending and 560 descending ADAs to be extracted and delimited. From the VLOS measured in both trajectories, a vertical velocity with a maximum value of -32.4 mm year(-1) was estimated. The analyzed subsidence was associated to four ascending and three descending ADAs and characterized by maximum VLOS of -25.5 and -25.2 mm year(-1). The maximum vertical velocity associated with urban subsidence was -32.4 mm year(-1). This subsidence is mainly linked to the compaction of the alluvial and anthropic deposits in the areas where urban and industrial sectors are located. The results of this work have allowed to: (1) detect and assess, from a quantitative point of view, the subsidence phenomena in populated and industrial areas of LMA; (2) establish the relationships between the subsidence phenomena and geological and hydrological characteristics.
Filiaciones:
Cuervas-Mons, J:
Department of Geology, University of Oviedo, Oviedo, 33005, Spain
Univ Oviedo, Dept Geol, Oviedo 33005, Spain
Zêzere, JL:
Institute of Geography and Spatial Planning, University of Lisbon, Lisbon, 1600-276, Portugal
Domínguez-Cuesta, MJ:
Department of Geology, University of Oviedo, Oviedo, 33005, Spain
Univ Oviedo, Dept Geol, Oviedo 33005, Spain
Barra, A:
Geomatics Division, Centre Tecnològic de Telecomunicacions de Catalunya (CTTC/CERCA), Castelldefels, 08860, Spain
Ctr Tecnol Telecomunicac Catalunya CTTC CERCA, Geomat Div, Castelldefels 08860, Spain
Reyes-Carmona, C:
Department of Geodynamics, University of Granada, Granada, 18071, Spain
Univ Granada, Dept Geodynam, Granada 18071, Spain
Monserrat, O:
Geomatics Division, Centre Tecnològic de Telecomunicacions de Catalunya (CTTC/CERCA), Castelldefels, 08860, Spain
Ctr Tecnol Telecomunicac Catalunya CTTC CERCA, Geomat Div, Castelldefels 08860, Spain
Oliveira, SC:
Institute of Geography and Spatial Planning, University of Lisbon, Lisbon, 1600-276, Portugal
Univ Lisbon, Inst Geog & Spatial Planning, P-1600276 Lisbon, Portugal
Melo, R:
Institute of Geography and Spatial Planning, University of Lisbon, Lisbon, 1600-276, Portugal
Department of Geosciences, University of Evora, Evora, 7000-671, Portugal
Univ Lisbon, Inst Geog & Spatial Planning, P-1600276 Lisbon, Portugal
Univ Evora, Dept Geosci, P-7000671 Evora, Portugal
Green Published, gold, All Open Access; Gold Open Access; Green Open Access
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