Relationship between piezometric level and ground deformations measured by means of DInSAR in the Vega Media of the Segura River (Spain)
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|Title:||Relationship between piezometric level and ground deformations measured by means of DInSAR in the Vega Media of the Segura River (Spain)|
|Authors:||Tomás, Roberto | Márquez Moreno, Yolanda | Lopez-Sanchez, Juan M. | Delgado, Jose | Blanco Sánchez, Pablo | Mallorquí Franquet, Jordi J. | Navarrete, D. | Duque Biarge, Sergi|
|Research Group/s:||Ingeniería del Terreno y sus Estructuras (InTerEs) | Señales, Sistemas y Telecomunicación | Geología Aplicada e Hidrogeología|
|Center, Department or Service:||Universidad de Alicante. Departamento de Ingeniería de la Construcción, Obras Públicas e Infraestructura Urbana | Universidad de Alicante. Departamento de Expresión Gráfica y Cartografía | Universidad de Alicante. Departamento de Física, Ingeniería de Sistemas y Teoría de la Señal | Universidad de Alicante. Departamento de Ciencias de la Tierra y del Medio Ambiente|
|Keywords:||DInSAR | CPT | Subsidence | Piezometric level | Overexploitation|
|Knowledge Area:||Ingeniería del Terreno | Geodinámica Externa | Teoría de la Señal y Comunicaciones|
|Publisher:||European Space Agency|
|Citation:||TOMÁS JOVER, Roberto, et al. "Relationship between piezometric level and ground deformations measured by means of DInSAR in the Vega Media of the Segura River (Spain)". En: Fringe 2005 Workshop [Recurso electrónico] : proceedings of the Conference held 28 November -- 2 December, 2005 in Frascati, Italy / edited by H. Lacoste and L. Ouwehand. Paris : European Space Agency, 2006.|
|Abstract:||Differential SAR Interferometry (DInSAR) is a remote sensing method with the well demonstrated ability to monitor geological hazards like earthquakes, landslides and subsidence. Among all these hazards, subsidence involves the settlement of the ground surface affecting wide areas. Frequently, subsidence is induced by overexploitation of aquifers and constitutes a common problem that affects developed societies. The excessive pumping of underground water decreases the piezometric level in the subsoil and, as a consequence, increases the effective stresses with depth causing a consolidation of the soil column. This consolidation originates a settlement of ground surface that must be withstood by civil structures built on these areas. In this paper we make use of an advanced DInSAR approach - the Coherent Pixels Technique (CPT)  - to monitor subsidence induced by aquifer overexploitation in the Vega Media of the Segura River (SE Spain) from 1993 to the present. 28 ERS-1/2 scenes covering a time interval of about 10 years were used to study this phenomenon. The deformation map retrieved with CPT technique shows settlements of up to 80 mm at some points of the studied zone. These values agree with data obtained by means of borehole extensometers, but not with the distribution of damaged buildings, well points and basements, because the occurrence of damages also depends on the structural quality of the buildings and their foundations. The most interesting relationship observed is the one existing between piezometric changes, settlement evolution and local geology. Three main patterns of ground surface and piezometric level behaviour have been distinguished for the study zone during this period: 1) areas where deformation occurs while ground conditions remain altered (recent deformable sediments), 2) areas with no deformation (old and non-deformable materials), and 3) areas where ground deformation mimics piezometric level changes (expansive soils). The temporal relationship between deformation patterns and soil characteristics has been analysed in this work, showing a delay between them. Moreover, this technique has allowed the measurement of ground subsidence for a period (1993-1995) where no instrument information was available.|
|Sponsor:||This study was partially financed by the Spanish Ministery of Science and Technology and FEDER as part of projects TIC2002-04451, BTE2002-12456-E, and TEC2005-06863-C02/TCM, and by the Valencia Regional Government as part of projects GV04B/556 and GRUPOS03/085.|
|Appears in Collections:||INV - GAH - Comunicaciones a Congresos, Conferencias, etc.|
INV - INTERES - Comunicaciones a Congresos, Conferencias, etc.
INV - SST - Comunicaciones a Congresos, Conferencias, etc.
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