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| Titel |
Stable water isotope tracing through hydrological models for disentangling runoff generation processes at the hillslope scale |
| VerfasserIn |
D. Windhorst, P. Kraft, E. Timbe, H.-G. Frede, L. Breuer |
| 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. 10 ; Nr. 18, no. 10 (2014-10-16), S.4113-4127 |
| Datensatznummer |
250120500
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| Publikation (Nr.) |
 copernicus.org/hess-18-4113-2014.pdf |
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| Zusammenfassung |
| Hillslopes are the dominant landscape components where incoming
precipitation becomes groundwater, streamflow or
atmospheric water vapor. However, directly observing flux partitioning in
the soil is almost impossible. Hydrological hillslope models are therefore
being used to investigate the processes involved. Here we report on a
modeling experiment using the Catchment Modeling Framework (CMF) where
measured stable water isotopes in vertical soil profiles along a tropical
mountainous grassland hillslope transect are traced through the model to
resolve potential mixing processes. CMF simulates advective transport of
stable water isotopes 18O and 2H based on the Richards equation
within a fully distributed 2-D representation of the hillslope. The model
successfully replicates the observed temporal pattern of soil water isotope
profiles (R2 0.84 and Nash–Sutcliffe efficiency (NSE) 0.42). Predicted flows are in good
agreement with previous studies. We highlight the importance of groundwater
recharge and shallow lateral subsurface flow, accounting for 50 and
16% of the total flow leaving the system, respectively. Surface runoff is
negligible despite the steep slopes in the Ecuadorian study region. |
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