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| Titel |
Entropy production of soil hydrological processes and its maximisation |
| VerfasserIn |
P. Porada, A. Kleidon, S. J. Schymanski |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
2190-4979
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| Digitales Dokument |
URL |
| Erschienen |
In: Earth System Dynamics ; 2, no. 2 ; Nr. 2, no. 2 (2011-09-02), S.179-190 |
| Datensatznummer |
250000603
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| Publikation (Nr.) |
 copernicus.org/esd-2-179-2011.pdf |
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| Zusammenfassung |
| Hydrological processes are irreversible and produce entropy. Hence, the
framework of non-equilibrium thermodynamics is used here to describe them
mathematically. This means flows of water are written as functions of
gradients in the gravitational and chemical potential of water between two
parts of the hydrological system. Such a framework facilitates a consistent
thermodynamic representation of the hydrological processes in the model.
Furthermore, it allows for the calculation of the entropy production
associated with a flow of water, which is proportional to the product of
gradient and flow. Thus, an entropy budget of the hydrological cycle at the
land surface is quantified, illustrating the contribution of different
processes to the overall entropy production. Moreover, the proposed Principle
of Maximum Entropy Production (MEP) can be applied to the model. This means,
unknown parameters can be determined by setting them to values which lead to
a maximisation of the entropy production in the model. The model used in this
study is parametrised according to MEP and evaluated by means of several
observational datasets describing terrestrial fluxes of water and carbon. The
model reproduces the data with good accuracy which is a promising result with
regard to the application of MEP to hydrological processes at the land
surface. |
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