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| Titel |
The flood event that affected Badajoz in November 1997 |
| VerfasserIn |
P. Lorente, E. Hernández, S. Queralt, P. Ribera |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1680-7340
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| Digitales Dokument |
URL |
| Erschienen |
In: Observation, Prediction and Verification of Precipitation (EGU Session 2007) ; Nr. 16 (2008-04-09), S.73-80 |
| Datensatznummer |
250013073
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| Publikation (Nr.) |
 copernicus.org/adgeo-16-73-2008.pdf |
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| Zusammenfassung |
| The flooding episode of November 1997 in Badajoz was one of the most
dramatic catastrophes in Spain: as a result, there were 21 fatalities and
huge financial damages. The main purpose of this work is to assess the
prevailing synoptic conditions as well as detailing the mesoscale effects by
means of moisture sources and dynamic and thermodynamic instability analysis
involved in the November 1997 Spanish severe weather episode. In order to
achieve the above, this flood event is described in terms of moisture
content evolution by means of individual particle simulation along 3-day
back-trajectories. A Lagrangian model is applied in order to characterize
the atmospheric particles involved in the focused case (localization, height
and specific humidity) which give rise to sudden precipitation stream.
Geopotential height and temperature fields were used to describe the
synoptic situation. Thermodynamic indices, such as CAPE, SWEAT and KI, and
dynamic parameters like potential vorticity anomaly at 330 K isentropic
surface and Q vector divergence were also calculated in order to complete
the analysis and to give a thorough weather frame taking into account the
atmospheric instability. The results of this work suggest this
flood event was due mainly to strong dynamic instability along with large
amounts of moisture advected by a trough, while the thermodynamic
instability played a secondary role. Finally, a new methodology based on a
technique proposed by Tremblay (2005) has been developed in order to
separate the precipitation into stratiform and convective components. It is
evident that the event was associated with a predominant convective regime. |
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