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| Titel |
Dendrogeomorphic analysis of Flash Floods in a small ungauged mountain catchment (Central Spain) |
| VerfasserIn |
Virginia Ruiz-Villanueva, Andres Diez-Herrero, Markus Stoffel, Michelle Bollschweiler, Jose Maria Bodoque, Juan Antonio Ballesteros |
| Konferenz |
EGU General Assembly 2010
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 12 (2010) |
| Datensatznummer |
250044563
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| Zusammenfassung |
| Flash floods represent one of the most significant natural hazards with serious death tolls
and economic damage at a worldwide level in general and in Mediterranean mountain catchments in
particular. In these environments, systematic data is often lacking and analyses have to be based on
alternative approaches such as dendrogeomorphology. In this study, we focus on the identification of
flash floods based on growth disturbances (GD) observed in 98 heavily affected Mediterranean pine
trees (Pinus pinaster Ait.) located in or next to the torrential channel of the Pelayo River in the Spanish
Central System. Flash floods are quite common in this catchment and are triggered by heavy storms,
with high discharge and debris transport rates favoured by high stream gradients. Comparison of the
anomalies in tree morphology and the position of the trees in the channel showed that the intensity of
the disturbance clearly depends on geomorphology. The dating of past flash-flood events was based on
the number and intensity of GD observed in the tree-ring series, and on the spatial distribution of
affected trees along the torrent, thus allowing seven flash-flood events during the last ~50 years to be
dated, namely in 1963, 1966, 1973, 1976, 1996, 2000, and 2005. |
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