2024-03-28T20:37:57Zhttp://digital.csic.es/dspace-oai/requestoai:digital.csic.es:10261/1229812022-10-04T11:28:19Zcom_10261_39226com_10261_8com_10261_262578col_10261_42742col_10261_262579
Twenty-year advanced DInSAR analysis of severe land subsidence: The Alto Guadalentín Basin (Spain) case study
Bonì, Roberta
Herrera García, Gerardo
Meisina, Claudia
Notti, Davide
Béjar Pizarro, Marta
Zucca, Francesco
González, Pablo J.
Palano, Mimmo
Tomás, Roberto
Fernández Torres, José
Fernández-Merodo, José Antonio
Mulas de la Peña, Joaquín
Aragón, Ramón
Guardiola Albert, Carolina
Mora, Óscar
Ministerio de Economía y Competitividad (España)
Ministerio de Educación, Cultura y Deporte (España)
Land subsidence
Persistent Scatterer Interferometry (PSI)
Spatio-temporal analysis
Lorca
Groundwater level
GPS
A twenty-year period of severe land subsidence evolution in the Alto Guadalentín Basin (southeast Spain) is monitored using multi-sensor SAR images, processed by advanced differential interferometric synthetic aperture radar (DInSAR) techniques. The SAR images used in this study consist of four datasets acquired by ERS-1/2, ENVISAT, ALOS and COSMO-SkyMed satellites between 1992 and 2012. The integration of ground surface displacement maps retrieved for different time periods allows us to quantify up to 2.50 m of cumulated displacements that occurred between 1992 and 2012 in the Alto Guadalentín Basin. DInSAR results were locally compared with global positioning system (GPS) data available for two continuous stations located in the study area, demonstrating the high consistency of local vertical motion measurements between the two different surveying techniques. An average absolute error of 4.6 ± 4 mm for the ALOS data and of 4.8 ± 3.5 mm for the COSMO-SkyMed data confirmed the reliability of the analysis. The spatial analysis of DInSAR ground surface displacement reveals a direct correlation with the thickness of the compressible alluvial deposits. Detected ground subsidence in the past 20 years is most likely a consequence of a 100–200 m groundwater level drop that has persisted since the 1970s due to the overexploitation of the Alto Guadalentín aquifer system. The negative gradient of the pore pressure is responsible for the extremely slow consolidation of a very thick (> 100 m) layer of fine-grained silt and clay layers with low vertical hydraulic permeability (approximately 50 mm/h) wherein the maximum settlement has still not been reached.
DORIS project (Ground Deformation Risk Scenarios: an Advanced Assessment Service) funded by the EC-GMES-FP7 initiative (Grant Agreement 423 no. 242212)
TEC2011-28201-C02
AYA2010-17448
ESP2013-47780-C2-1-R
ESP2013-47780-C2-2-R
PRX14/00100
Peer reviewed
2015-10-05T08:18:24Z
2015-10-05T08:18:24Z
2015-08-11
artículo
http://purl.org/coar/resource_type/c_6501
Engineering Geology, 198: 40–52 (2015)
0013-7952
http://hdl.handle.net/10261/122981
10.1016/j.enggeo.2015.08.014
http://dx.doi.org/10.13039/501100003329
http://dx.doi.org/10.13039/501100003176
en
Postprint
http://dx.doi.org/10.1016/j.enggeo.2015.08.014
Sí
open
Elsevier