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Entropy Production of Soil Hydrological Processes and Its Maximisation : Volume 2, Issue 1 (28/01/2011)

By Porada, P.

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Book Id: WPLBN0004007286
Format Type: PDF Article :
File Size: Pages 28
Reproduction Date: 2015

Title: Entropy Production of Soil Hydrological Processes and Its Maximisation : Volume 2, Issue 1 (28/01/2011)  
Author: Porada, P.
Volume: Vol. 2, Issue 1
Language: English
Subject: Science, Earth, System
Collections: Periodicals: Journal and Magazine Collection (Contemporary), Copernicus GmbH
Publication Date:
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications


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Schymanski, S. J., Kleidon, A., & Porada, P. (2011). Entropy Production of Soil Hydrological Processes and Its Maximisation : Volume 2, Issue 1 (28/01/2011). Retrieved from

Description: Max Planck Institute for Biogeochemistry, P.O. Box 10 01 64, 07701 Jena, Germany. 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.

Entropy production of soil hydrological processes and its maximisation

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