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| Titel |
Estimation of extreme flash flood evolution in Barcelona County from 1351 to 2005 |
| VerfasserIn |
A. Barrera, M. C. Llasat, M. Barriendos |
| 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 ; 6, no. 4 ; Nr. 6, no. 4 (2006-06-12), S.505-518 |
| Datensatznummer |
250003603
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| Publikation (Nr.) |
 copernicus.org/nhess-6-505-2006.pdf |
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| Zusammenfassung |
| Every year, flash floods cause economic losses and major problems for
undertaking daily activity in the Catalonia region (NE Spain). Sometimes
catastrophic damage and casualties occur. When a long term analysis of
floods is undertaken, a question arises regarding the changing role of the
vulnerability and the hazard in risk evolution. This paper sets out to give
some information to deal with this question, on the basis of analysis of all
the floods that have occurred in Barcelona county (Catalonia) since the 14th
century, as well as the flooded area, urban evolution, impacts and the
weather conditions for any of most severe events. With this objective, the
identification and classification of historical floods, and characterisation
of flash-floods among these, have been undertaken. Besides this, the main
meteorological factors associated with recent flash floods in this city and
neighbouring regions are well-known. On the other hand, the identification
of rainfall trends that could explain the historical evolution of flood
hazard occurrence in this city has been analysed. Finally, identification of
the influence of urban development on the vulnerability to floods has been
carried out. Barcelona city has been selected thanks to its long continuous
data series (daily rainfall data series, since 1854; one of the longest
rainfall rate series of Europe, since 1921) and for the accurate historical
archive information that is available (since the Roman Empire for the urban
evolution). The evolution of flood occurrence shows the existence of
oscillations in the earlier and later modern-age periods that can be
attributed to climatic variability, evolution of the perception threshold
and changes in vulnerability. A great increase of vulnerability can be
assumed for the period 1850–1900. The analysis of the time evolution for
the Barcelona rainfall series (1854–2000) shows that no trend exists,
although, due to changes in urban planning, flash-floods impact has altered
over this time. The number of catastrophic flash floods has diminished,
although the extraordinary ones have increased. |
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