Comparison of water-level, extensometric, DInSAR and simulation data for quantification of subsidence in Murcia City (SE Spain)

Tessitore, S.; Fernández-Merodo, J. A.; Herrera, G.; Tomás, R.; Ramondini, M.; Sanabria, M.; Duro, J.; Mulas, J.; Calcaterra, D.

Comparison of water-level, extensometric, DInSAR and simulation data for quantification of subsidence in Murcia City (SE Spain) | Gegenüberstellung des Wasserstands, extensometrischer Messungen, DInSAR und Simulationsdaten zur Quantifizierung der Setzung in Murcia (Südost-Spanien) Comparaison entre niveaux d’eau, données d’extensiométrie, d’interférométrie radar et de simulation pour la quantification de la subsidence dans la ville de Murcia (Sud-Est de l’Espagne) Comparación de datos de nivel de agua, extensométricos, de DInSAR y de simulación para la cuantificación de la subsidencia en la ciudad de Murcia (SE de España) مقارنه لبيانات منسوب المياه, مقياس التمدد, التداخلات التفاضلية للقياسات الرادارية ذات الفتحة الاصطناعية و بيانات المحاكاة لتقدير الهبوط في مدينه مورسيا (جنوب شرق أسبانيا) 对水位、延伸仪测量、监测地表三维形变方法和模拟资料进行对比以量化(西班牙东南部)穆尔西亚市沉降 Confronto di dati piezometrici, estensimetrici, DInSAR e di simulazione per la stima quantitativa della subsidenza nella citta di Murcia (Spagna sud-orientale) Comparação do nível da água, extensometria, DInSAR e simulação dos dados para a qualificação da subsidência na cidade de Múrcia (Sudeste da Espanha)

2016

Subsidence due to groundwater overexploitation has been recognized in the metropolitan area of Murcia (25 km²) in south-eastern Spain since the early 1990s. Previous published works have focused their attention on land subsidence that occurred during the drought period between 1995 and 2008. This work first analyzes the groundwater recovery that has occurred since 2008 and then determines the kind of associated ground deformation detected by the new extensometric data. Subsequently, subsidence time series are computed on 24 geotechnical boreholes scattered throughout the study area by means of a hydro-mechanical finite element code and a linear-elastic constitutive law. A spatio-temporal interpolation of the numerically modeled surface displacements is performed over the whole domain and compared with extensometers and DInSAR-derived displacement maps in two different periods: the drought period from 2004 to 2008, and the recovery period from 2008 to 2012. In spite of the limited information on the geomechanical parameters characterizing the modelled geological formations, the proposed approach is able to discriminate areas where the soils have an elastic behavior (small differences in the comparisons) or an elasto-plastic behavior (large differences in the comparisons). This zonation enhances the understanding of the subsidence phenomenon in Murcia City and could prevent, from a quantitatively point of view, future severe subsidence due to aquifer overexploitation.

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