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| Titel |
Analysis of the runoff response of an alpine catchment at different scales |
| VerfasserIn |
B. Zillgens, B. Merz, R. Kirnbauer, N. Tilch |
| 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 ; 11, no. 4 ; Nr. 11, no. 4 (2007-07-18), S.1441-1454 |
| Datensatznummer |
250009399
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| Publikation (Nr.) |
 copernicus.org/hess-11-1441-2007.pdf |
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| Zusammenfassung |
| To understand how hydrological processes are related across different
spatial scales, 201 rainfall runoff events were examined in three nested
catchments of the upper river Saalach in the Austrian Alps. The Saalach
basin is a nested catchment covering different spatial scales, from the
micro-scale (Limberg, 0.07 km²), to the small-catchment scale (Rammern,
15.5 km²), and the meso-scale (Viehhofen, 150 km²). At these three
scales two different event types could clearly be identified, depending on
rainfall characteristics and initial baseflow level: (1) a unimodal event
type with a quick rising and falling hydrograph, responding to short
duration rainfall, and (2) a bimodal event type with a double peak
hydrograph at the micro-scale and substantially increased flow values at the
larger basins Rammern and Viehhofen, responding to long duration rainfall
events. In all cases where a bimodal event was identified at the microscale,
the hydrographs at the larger scales exhibited significantly attenuated
recession behavior, quantified by recession constants. At all scales, the
bimodal events are associated with considerably higher runoff volumes than
the unimodal events. From the investigations at the headwater Limberg we
came to the conclusion that the higher amount of runoff of bimodal events is
due to the mobilization of subsurface flow processes. The analysis shows
that the occurrence of the two event types is consistent over three orders
of magnitude in area. This link between the scales means that the runoff
behavior of the headwater may be used as an indicator of the runoff behavior
of much larger areas. |
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