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| Titel |
Applied tracers for the observation of subsurface stormflow at the hillslope scale |
| VerfasserIn |
J. Wienhöfer, K. Germer, F. Lindenmaier, A. Färber, E. Zehe |
| 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 ; 13, no. 7 ; Nr. 13, no. 7 (2009-07-14), S.1145-1161 |
| Datensatznummer |
250011937
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| Publikation (Nr.) |
 copernicus.org/hess-13-1145-2009.pdf |
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| Zusammenfassung |
| Rainfall-runoff response in temperate humid headwater catchments is mainly
controlled by hydrological processes at the hillslope scale. Applied tracer
experiments with fluorescent dye and salt tracers are well known tools in
groundwater studies at the large scale and vadose zone studies at the plot
scale, where they provide a means to characterise subsurface flow. We extend
this approach to the hillslope scale to investigate saturated and unsaturated
flow paths concertedly at a forested hillslope in the Austrian Alps. Dye
staining experiments at the plot scale revealed that cracks and soil pipes
function as preferential flow paths in the fine-textured soils of the study
area, and these preferential flow structures were active in fast subsurface
transport of tracers at the hillslope scale. Breakthrough curves obtained
under steady flow conditions could be fitted well to a one-dimensional
convection-dispersion model. Under natural rainfall a positive correlation of
tracer concentrations to the transient flows was observed. The results of
this study demonstrate qualitative and quantitative effects of preferential
flow features on subsurface stormflow in a temperate humid headwater
catchment. It turns out that, at the hillslope scale, the interactions of
structures and processes are intrinsically complex, which implies that
attempts to model such a hillslope satisfactorily require detailed
investigations of effective structures and parameters at the scale of
interest. |
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