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| Titel |
A robust and energy-conserving model of freezing variably-saturated soil |
| VerfasserIn |
M. Dall'Amico, S. Endrizzi, S. Gruber, R. Rigon |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1994-0416
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| Digitales Dokument |
URL |
| Erschienen |
In: The Cryosphere ; 5, no. 2 ; Nr. 5, no. 2 (2011-06-01), S.469-484 |
| Datensatznummer |
250002437
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| Publikation (Nr.) |
 copernicus.org/tc-5-469-2011.pdf |
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| Zusammenfassung |
| Phenomena involving frozen soil or rock are important in many natural systems
and, as a consequence, there is a great interest in the modeling of their
behavior. Few models exist that describe this process for both saturated and
unsaturated soil and in conditions of freezing and thawing, as the energy
equation shows strongly non-linear characteristics and is often difficult to
handle with normal methods of iterative integration. Therefore in this paper
we propose a method for solving the energy equation in freezing soil. The
solver is linked with the solution of Richards equation, and is able to
approximate water movement in unsaturated soils and near the liquid-solid
phase transition. A globally-convergent Newton method has been implemented to
achieve robust convergence of this scheme. The method is tested by comparison
with an analytical solution to the Stefan problem and by comparison with
experimental data derived from the literature. |
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