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| Titel |
Controls on runoff generation and scale-dependence in a distributed hydrologic model |
| VerfasserIn |
E. R. Vivoni, D. Entekhabi, R. L. Bras, V. Y. Ivanov |
| 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. 5 ; Nr. 11, no. 5 (2007-10-18), S.1683-1701 |
| Datensatznummer |
250009477
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| Publikation (Nr.) |
 copernicus.org/hess-11-1683-2007.pdf |
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| Zusammenfassung |
| Hydrologic response in natural catchments is controlled by a set of complex
interactions between storm properties, basin characteristics and antecedent
wetness conditions. This study investigates the transient runoff response to
spatially-uniform storms of varying properties using a distributed model of
the coupled surface-subsurface system, which treats heterogeneities in
topography, soils and vegetation. We demonstrate the control that the
partitioning into multiple runoff mechanisms (infiltration-excess,
saturation-excess, perched return flow and groundwater exfiltration) has on
nonlinearities in the rainfall-runoff transformation and its
scale-dependence. Antecedent wetness imposed through a distributed water
table position is varied to illustrate its effect on runoff generation.
Results indicate that transitions observed in basin flood response and its
nonlinear and scale-dependent behavior can be explained by shifts in the
surface-subsurface partitioning. An analysis of the spatial organization of
runoff production also shows that multiple mechanisms have specific
catchment niches and can occur simultaneously in the basin. In addition,
catchment scale plays an important role in the distribution of runoff
production as basin characteristics (soils, vegetation, topography and
initial wetness) are varied with basin area. For example, we illustrate how
storm characteristics and antecedent wetness play an important role in the
scaling properties of the catchment runoff ratio. |
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