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| Titel |
Historical flash floods retromodelling in the Ondara River in Tàrrega (NE Iberian Peninsula) |
| VerfasserIn |
J. C. Balasch, J. L. Ruiz-Bellet, J. Tuset |
| 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 ; 11, no. 12 ; Nr. 11, no. 12 (2011-12-21), S.3359-3371 |
| Datensatznummer |
250009839
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| Publikation (Nr.) |
 copernicus.org/nhess-11-3359-2011.pdf |
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| Zusammenfassung |
Flash floods in the Ondara River have caused many fatalities and damages in
the town of Tàrrega in the last 400 yr. Unfortunately, no flow
records are available.
However, floods can sometimes be reconstructed thanks to available
historical information: limnimarks, written accounts and archaeological
surveys. Indeed, from these data and using the retromodelling method on
three different scenarios to take into account morphology changes, the peak
flows of the seven greatest floods occurred in Tàrrega since the 17th century
were estimated.
The results showed that the heaviest flood's specific peak flow (10.7 m3 s−1 km−2)
ranks among the highest ever modelled or measured in similar-sized catchments in the
Western Mediterranean region. The results pointed out, as well, that the
changes in channel's morphology (mainly, the disappearance of a mediaeval
bridge under sediment) caused by one of the floods increased the hydraulic
capacity of a crucial cross-section. All this resulted in modest floods
invading the town less often, but with much faster and, thus, more destructive
flows.
A preliminary estimation of the results' uncertainty was
4% for great floods and 18% for modest floods.
The reconstructed peak flows will be introduced in a database for a future use
in climatic and hydrological studies. |
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