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| Titel |
Hydrogeology of an Alpine rockfall aquifer system and its role in flood attenuation and maintaining baseflow |
| VerfasserIn |
U. Lauber, P. Kotyla, D. Morche, N. Goldscheider |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1027-5606
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| Digitales Dokument |
URL |
| Erschienen |
In: Hydrology and Earth System Sciences ; 18, no. 11 ; Nr. 18, no. 11 (2014-11-06), S.4437-4452 |
| Datensatznummer |
250120521
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| Publikation (Nr.) |
 copernicus.org/hess-18-4437-2014.pdf |
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| Zusammenfassung |
| The frequency and intensity of extreme hydrological events in Alpine regions
is projected to increase with climate change. The goal of this study is to
better understand the functioning of aquifers composed of complex alluvial
and rockfall deposits in Alpine valleys and to quantify the role of these
natural storage spaces in flood attenuation and baseflow maintenance.
Geomorphological and hydrogeological mapping, tracer tests, and continuous
flow measurements were conducted in the Reintal (German Alps), where
runoff from a karst spring infiltrates a series of postglacial
alluvial/rockfall aquifers. During high-flow conditions, groundwater
velocities of 30 m h−1 were determined along 500 m; hydrograph analyses
revealed short lag times (5 h) between discharge peaks upstream and
downstream from the aquifer series; the maximum discharge ratio downstream
(22) and the peak recession coefficient (0.196 d−1) are low compared
with other Alpine catchments. During low-flow conditions, the underground
flow path length increased to 2 km and groundwater velocities decreased to
13 m h−1. Downstream hydrographs revealed a delayed discharge response after
101 h and peaks damped by a factor of 1.5. These results indicate that
alluvial/rockfall aquifers might play an important role in the flow regime
and attenuation of floods in Alpine regions. |
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