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| Titel |
Impact of snow state variation for design flood simulations in glacierized catchments |
| VerfasserIn |
J. Schöber, S. Achleitner, R. Kirnbauer, F. Schöberl, H. Schönlaub |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1680-7340
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| Digitales Dokument |
URL |
| Erschienen |
In: Proceedings of the 14th Workshop on Large-scale Hydrological Modelling ; Nr. 31 (2012-07-11), S.39-48 |
| Datensatznummer |
250017308
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| Publikation (Nr.) |
 copernicus.org/adgeo-31-39-2012.pdf |
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| Zusammenfassung |
| A continuously running hydrological energy balance model was used to analyse
the influence of different snow covers on the formation of large floods
within glacierized catchments. Model outputs from three different catchments
in the Austrian Alps with glacierizations ranging from 30 to 39% were
statistically interpreted to cover a wide range of possible combinations of
areal snow cover distribution and mean snow water equivalent (SWEm) and
to define initialisation values for extreme runoff scenarios. These model
states consider snow conditions between less than 10% snow coverage up
to almost complete snow coverage, with different snow depths represented by
minimum, mean or maximum levels of SWEm. For the utilization of extreme
runoffs, these snow cover states were combined with design storm input data.
An analysis of the resulting flood hydrographs showed that the maximum
runoff values occur with minimal snow cover conditions. With increasing snow
coverage and SWEm, flow magnitudes tend to decrease while the relevant
precipitation time increases significantly. The influence of topographical
catchment features, snow cover and SWEm on the simulated scenario
discharge is discussed. The contribution of the different runoff components
to the modelled peak flows confirms the assumption that floods in
glacierized catchments are a combination of directly discharging rain and
ice melt. |
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