A carregar...
Publicação
Detección y análisis de subsidencia urbana en el Área Metropolitana de Lisboa (Portugal) a partir de técnicas A-DInSAR
| Nome: | Descrição: | Tamanho: | Formato: | |
|---|---|---|---|---|
| 933.32 KB | Adobe PDF |
Orientador(es)
Resumo(s)
El Área Metropolitana de Lisboa, con una extensión de 4.390 km2 , está localizada en el centro de Portugal. El objetivo principal de este estudio ha sido detectar y analizar deformaciones del terreno asociadas a subsidencia urbana mediante técnicas de Interferometría SAR Diferencial Avanzadas (A-DInSAR). Para ello, se siguió el siguiente procedimiento metodológico: 1) selección y procesamiento de 48 imágenes SAR en órbita ascendente y 61 imágenes SAR en órbita descendente proporcionadas por el satélite Sentinel-1A entre enero de 2018 y abril de 2020, a partir de la técnica P-SBAS implementada en el servicio GEP de la Agencia Espacial Europea; 2) obtención de mapas de velocidades medias de deformación en la dirección suelo-satélite (LOS) (mm/año) y las series temporales de deformación (mm), aplicación del procedimiento post-procesado ADA (Active Deformation Areas) para detectar áreas locales con deformaciones y estimación de la velocidad vertical; 3) validación e interpretación de los resultados A-DInSAR por medio de campañas de campo y características geológicas. Los resultados han mostrado velocidades máximas -25,5 mm/año, mientras que la velocidad vertical estimada fue de -32,4 mm/año. La comparación entre las velocidades LOS, vertical y las ADAs obtenidas han permitido identificar dos sectores con subsidencia urbana y cuyas extensiones son de 2.601.950 y 222.846 m2 . El origen de la subsidencia urbana detectada ha sido relacionado con la compactación de depósitos aluviales y antrópicos. Este trabajo representa un avance significativo en la identificación y evaluación de la subsidencia urbana en el Área Metropolitana de Lisboa, así como una importante contribución que demuestra la utilidad y fiabilidad de las técnicas remotas en la detección y análisis de fenómenos de subsidencia.
The Lisbon Metropolitan Area, with an area of 4,390 km2 , is located in the center of Portugal. The main aim of this study was to detect and analyze ground deformations associated with urban subsidence using Advanced-Differential SAR Interferometry (A-DInSAR) techniques. For this purpose, the following methodological procedure was followed: 1) Selection and processing of 48 SAR images in ascending orbit and 61 SAR images in descending orbit provided by the Sentinel-1 A satellite between January 2018 and April 2020, from the P-SBAS technique implemented in the GEP service of the European Space Agency; 2) Obtaining mean deformation velocity maps in the Line-of-Sight (LOS) (mm/year) and the deformation time series (mm), application of the post-processing procedure ADA (Active Deformation Areas) to detect local areas with deformations and estimation of the vertical velocity; 3) Validation and interpretation of the A-DInSAR results by means of field campaigns and geological features. The results have shown maximum velocities -25.5 mm/year, while the estimated vertical velocity was -32.4 mm/year. The comparison between LOS, vertical velocities and ADAs obtained have allowed the identification of two sectors with urban subsidence and whose extensions are 2,601,950 and 222,846 m2 . The origin of the urban subsidence detected has been related to the compaction of alluvial and anthropic deposits. This work represents a significant advance in the identification and evaluation of urban subsidence in the Lisbon Metropolitan Area, as well as an important contribution that demonstrates the usefulness and reliability of remote techniques in the detection and analysis of subsidence phenomena.
The Lisbon Metropolitan Area, with an area of 4,390 km2 , is located in the center of Portugal. The main aim of this study was to detect and analyze ground deformations associated with urban subsidence using Advanced-Differential SAR Interferometry (A-DInSAR) techniques. For this purpose, the following methodological procedure was followed: 1) Selection and processing of 48 SAR images in ascending orbit and 61 SAR images in descending orbit provided by the Sentinel-1 A satellite between January 2018 and April 2020, from the P-SBAS technique implemented in the GEP service of the European Space Agency; 2) Obtaining mean deformation velocity maps in the Line-of-Sight (LOS) (mm/year) and the deformation time series (mm), application of the post-processing procedure ADA (Active Deformation Areas) to detect local areas with deformations and estimation of the vertical velocity; 3) Validation and interpretation of the A-DInSAR results by means of field campaigns and geological features. The results have shown maximum velocities -25.5 mm/year, while the estimated vertical velocity was -32.4 mm/year. The comparison between LOS, vertical velocities and ADAs obtained have allowed the identification of two sectors with urban subsidence and whose extensions are 2,601,950 and 222,846 m2 . The origin of the urban subsidence detected has been related to the compaction of alluvial and anthropic deposits. This work represents a significant advance in the identification and evaluation of urban subsidence in the Lisbon Metropolitan Area, as well as an important contribution that demonstrates the usefulness and reliability of remote techniques in the detection and analysis of subsidence phenomena.
Descrição
Palavras-chave
Subsidence Lisbon Metropolitan Area A-DInSAR