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| Titel |
Using in-situ temperature measurements to estimate saturated soil thermal properties by solving a sequence of optimization problems |
| VerfasserIn |
D. J. Nicolsky, V. E. Romanovsky, G. S. Tipenko |
| 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 ; 1, no. 1 ; Nr. 1, no. 1 (2007-11-22), S.41-58 |
| Datensatznummer |
250000108
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| Publikation (Nr.) |
 copernicus.org/tc-1-41-2007.pdf |
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| Zusammenfassung |
| We describe an approach to find an initial approximation to the thermal
properties of soil horizons. This technique approximates thermal
conductivity, porosity, unfrozen water content curves in horizons where no
direct temperature measurements are available. To determine physical
properties of ground material, optimization-based inverse techniques are
employed to fit the simulated temperatures to the measured ones. Two major
ingredients of these techniques are an algorithm to compute the soil
temperature dynamics and a procedure to find an initial approximation to the
ground properties. In this article we show how to determine the initial
approximation to the physical properties and present a new finite element
discretization of the heat equation with phase change to calculate the
temperature dynamics in soil. We successfully apply the proposed algorithm to
recover the soil properties for the Happy Valley site in Alaska using
one-year temperature dynamics. The determined initial approximation is
utilized to simulate the temperature dynamics over several consecutive years;
the difference between simulated and measured temperatures lies within
uncertainties of measurements. |
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