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| Titel |
Infiltration-soil moisture redistribution under natural conditions: experimental evidence as a guideline for realizing simulation models |
| VerfasserIn |
R. Morbidelli, C. Corradini, C. Saltalippi, A. Flammini, E. Rossi |
| 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 ; 15, no. 9 ; Nr. 15, no. 9 (2011-09-15), S.2937-2945 |
| Datensatznummer |
250012963
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| Publikation (Nr.) |
 copernicus.org/hess-15-2937-2011.pdf |
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| Zusammenfassung |
| The evolution in time, t, of the experimental soil moisture vertical profile
under natural conditions is investigated in order to address the
corresponding simulation modelling. The measurements were conducted in a
plot with a bare silty loam soil. The soil water content, θ, was continuously
monitored at different depths, z, using a Time Domain Reflectometry (TDR)
system. Four buriable three-rod waveguides were inserted horizontally at
different depths (5, 15, 25 and 35 cm). In addition, we used sensors of air
temperature and relative humidity, wind speed, solar radiation, evaporation
and rain as supports for the application of selected simulation models, as
well as for the detection of elements leading to their improvement. The
results indicate that, under natural conditions, very different trends of
the θ(z, t) function can be observed in the given fine-textured soil, where the
formation of a sealing layer over the parent soil requires an adjustment of
the simulation modelling commonly used for hydrological applications. In
particular, because of the considerable variations in the shape of the
moisture content vertical profile as a function of time, a generalization of
the existing models should incorporate a first approximation of the
variability in time of the saturated hydraulic conductivity, K1s, of the
uppermost soil. This conclusion is supported by the fact that the observed
shape of θ(z, t) can be appropriately reproduced by adopting the proposed
approach with K1s kept constant during each rainfall event but considered
variable from event to event, however the observed rainfall rate and the
occurrence of freeze-thaw cycles with high soil moisture contents have to be
explicitly incorporated in a functional form for K1s(t). |
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