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| Titel |
Gravitational and capillary soil moisture dynamics for distributed hydrologic models |
| VerfasserIn |
A. Castillo, F. Castelli, D. Entekhabi |
| 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 ; 19, no. 4 ; Nr. 19, no. 4 (2015-04-21), S.1857-1869 |
| Datensatznummer |
250120687
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| Publikation (Nr.) |
 copernicus.org/hess-19-1857-2015.pdf |
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| Zusammenfassung |
| Distributed and continuous catchment models are used to simulate water
and energy balance and fluxes across varied topography and
landscape. The landscape is discretized into computational plan elements at resolutions of 101–103 m, and soil moisture
is the hydrologic state variable. At the local scale, the vertical
soil moisture dynamics link hydrologic fluxes and provide continuity
in time. In catchment models these local-scale processes are modeled
using 1-D soil columns that are discretized into layers
that are usually 10−3–10−1 m in thickness. This creates
a mismatch between the horizontal and vertical scales. For
applications across large domains and in ensemble mode, this treatment
can be a limiting factor due to its high computational demand. This
study compares continuous multi-year simulations of soil moisture at
the local scale using (i) a 1-pixel version of a distributed catchment
hydrologic model and (ii) a benchmark detailed soil water physics
solver. The distributed model uses a single soil layer with a novel
dual-pore structure and employs linear parameterization of
infiltration and some other fluxes. The detailed solver uses multiple
soil layers and employs nonlinear soil physics relations to model flow
in unsaturated soils. Using two sites with different climates
(semiarid and sub-humid), it is shown that the efficient
parameterization in the distributed model captures the essential
dynamics of the detailed solver. |
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