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| Titel |
Depression storage and infiltration effects on overland flow depth-velocity-friction at desert conditions: field plot results and model |
| VerfasserIn |
M. J. Rossi, J. O. Ares |
| 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 ; 16, no. 9 ; Nr. 16, no. 9 (2012-09-14), S.3293-3307 |
| Datensatznummer |
250013470
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| Publikation (Nr.) |
 copernicus.org/hess-16-3293-2012.pdf |
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| Zusammenfassung |
| Water infiltration and overland flow are relevant in considering water
partition among plant life forms, the sustainability of vegetation and the
design of sustainable hydrological models and management. In arid and
semi-arid regions, these processes present characteristic trends imposed by
the prevailing physical conditions of the upper soil as evolved under
water-limited climate. A set of plot-scale field experiments at the
semi-arid Patagonian Monte (Argentina) were performed in order to estimate
the effect of depression storage areas and infiltration rates on depths,
velocities and friction of overland flows. The micro-relief of undisturbed
field plots was characterized at z-scale 1 mm through close-range
stereo-photogrammetry and geo-statistical tools. The overland flow areas
produced by controlled water inflows were video-recorded and the flow
velocities were measured with image processing software. Antecedent and
post-inflow moisture were measured, and texture, bulk density and physical
properties of the upper soil were estimated based on soil core analyses.
Field data were used to calibrate a physically-based, mass balanced, time
explicit model of infiltration and overland flows. Modelling results
reproduced the time series of observed flow areas, velocities and
infiltration depths. Estimates of hydrodynamic parameters of overland flow
(Reynolds-Froude numbers) are informed. To our knowledge, the study here
presented is novel in combining several aspects that previous studies do not
address simultaneously: (1) overland flow and infiltration parameters were
obtained in undisturbed field conditions; (2) field measurements of overland
flow movement were coupled to a detailed analysis of soil microtopography at
1 mm depth scale; (3) the effect of depression storage areas in infiltration
rates and depth-velocity friction of overland flows is addressed. Relevance
of the results to other similar desert areas is justified by the
accompanying biogeography analysis of similarity of the environment where
this study was performed with other desert areas of the world. |
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