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| Titel |
Rainfall Characterization in the Ebro river basin (Spain) through the structure function |
| VerfasserIn |
Jose Luis Valencia, Ana María Tarquis, Antonio Saa, Maria Villeta |
| Konferenz |
EGU General Assembly 2014
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 16 (2014) |
| Datensatznummer |
250097271
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| Publikation (Nr.) |
 EGU/EGU2014-12835.pdf |
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| Zusammenfassung |
| Rainfall events present a high variability in time and intensity in Spain, mainly in the
Mediterranean coast. These events has been studied in the present work through the
multiscale turbulence formalism based on daily rainfall series recorded during 23 years at 265
meteorological stations at the Ebro River basin (Northeast Spain).
The Structure Function and two parameters derived from it, intermittency (μint) and
multifractality (λdesv), have been estimated for each station. These proposed indicators are
pretty straightforward calculations, therefore they are advisable to use in a generalize way in
the multifractal analysis.
A spatial study of these parameters has been carried on verifying the influence of different
geographical features such as altitude, relative position in the river basin and proximity to the
coast.
Finally, a principal components analysis based on the matrix correlation between
intermittency and multifractality values has been applied pointing out a symmetry respect to
the main axis of the river.
The results show that the space evolution of the multifractality parameter is symmetric
with respect to the main axis of the river. The multifractality values grow as we head towards
the east. Intermittency presents major irregularities, especially on the left side of the river
(north) where it usually reaches higher values than in the south for similar multifractality
values.
We have found a direct correlation between these two parameters. Depending on the
watershed areas these relationships have different intensities. Therefore, the correlation is
higher and more significant for those stations that are below 600 m. and non significant for
those that are above 900 m. The highest values for the two parameters are close
to the main channel and near the mouth of the river (areas with lower altitude)
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On the other hand, the map based on the differences of clustering analysis points close to
each other is due to the local aspect of rainfall distribution that is principally explained by the
intermittency. |
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