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| Titel |
Multi-temporal SAR interferometry reveals acceleration of bridge sinking before collapse |
| VerfasserIn |
J. J. Sousa, L. Bastos |
| 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 ; 13, no. 3 ; Nr. 13, no. 3 (2013-03-18), S.659-667 |
| Datensatznummer |
250018387
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| Publikation (Nr.) |
 copernicus.org/nhess-13-659-2013.pdf |
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| Zusammenfassung |
| On the night of 4 March 2001, at Entre-os-Rios (Northern Portugal), the
Hintze Ribeiro centennial bridge collapsed killing 59 people traveling in a
bus and three cars that were crossing the Douro River. According to the
national authorities, the collapse was due to two decades of uncontrolled
sand extraction which compromised the stability of the bridge's pillars,
together with underestimating the warnings from divers and technicians. In
this work we do not intend to corroborate or contradict the official version
of the accident's causes, but only demonstrate the potential of
Multi-Temporal Interferometric techniques for detection and monitoring of
deformations in structures such as bridges, and consequently the usefulness
of the derived information in some type of early warning system to help
prevent new catastrophic events. Based on the analysis of 52 ERS-1/2 covering
the period from May 1995 to the fatal occurrence, we were able to detect
significant movements, reaching rates of 20 mm yr−1, in the section of
the bridge that fell into the Douro River, which are obvious signs of the
bridge's instability. These promising results demonstrate that with the new
high-resolution synthetic aperture radar satellite scenes it is possible to
develop interferometric based methodologies for structural health monitoring. |
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