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| Titel |
Advanced interpretation of subsidence in Murcia (SE Spain) using A-DInSAR data – modelling and validation |
| VerfasserIn |
G. Herrera, J. A. Fernández, R. Tomas, G. Cooksley, J. Mulas |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1561-8633
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| Digitales Dokument |
URL |
| Erschienen |
In: Natural Hazards and Earth System Science ; 9, no. 3 ; Nr. 9, no. 3 (2009-05-04), S.647-661 |
| Datensatznummer |
250006775
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| Publikation (Nr.) |
 copernicus.org/nhess-9-647-2009.pdf |
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| Zusammenfassung |
| Subsidence is a natural hazard that affects wide areas in the world causing
important economic costs annually. This phenomenon has occurred in the
metropolitan area of Murcia City (SE Spain) as a result of groundwater
overexploitation. In this work aquifer system subsidence is investigated
using an advanced differential SAR interferometry remote sensing technique
(A-DInSAR) called Stable Point Network (SPN). The SPN derived displacement
results, mainly the velocity displacement maps and the time series of the
displacement, reveal that in the period 2004–2008 the rate of subsidence
in Murcia metropolitan area doubled with respect to the previous period from
1995 to 2005. The acceleration of the deformation phenomenon is explained by
the drought period started in 2006. The comparison of the temporal evolution
of the displacements measured with the extensometers and the SPN technique
shows an average absolute error of 3.9±3.8 mm. Finally,
results from a finite element model developed to simulate the recorded time
history subsidence from known water table height changes compares well with
the SPN displacement time series estimations. This result demonstrates the
potential of A-DInSAR techniques to validate subsidence prediction models as
an alternative to using instrumental ground based techniques for validation. |
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