Deutsche Übersetzung des Titels: Gekoppelte Transportprozesse in natürlichen porösen Medien
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Übersetzung des Abstracts (Englisch)
As the interactions between transport processes are important for a number of interesting systems, a set of partial differential equations and appropriate parameter functions for the study of coupled water, heat, gas and solute transport was formulated and a state of the art computer model for the numerical solution of the equation system was created. A new phase pressure/partial pressure formulation for the coupled transport of liquid and gas phase was developed. The model was used to simulate the water and energy dynamics of a permafrost soil. A good qualitative agreement was achieved. Differences between modeled and measured data could be explained with heterogeneity in combination with the model's sensitivity to a change in hydraulic parameters. Water vapor and solute transport had no effect on the simulation result but transport of liquid water proved to be an important heat transfer process near 0 °C. The impact of the chosen parameterization and model on the simulation of a multistep outflow experiment was analyzed. Differences between a model based on Richards' equation and a twophase model only occurred when the Brooks-Corey parameterization was used. The results of the twophase model showed a retarded drainage and a hysteresis during imbibation which is in good agreement with experimental results.
Dokumententyp: | Dissertation |
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Erstgutachter: | Roth, Prof. Dr. Kurt |
Tag der Prüfung: | 19 Dezember 2001 |
Erstellungsdatum: | 29 Jan. 2002 00:00 |
Erscheinungsjahr: | 2001 |
Institute/Einrichtungen: | Fakultät für Physik und Astronomie > Institut für Umweltphysik |
DDC-Sachgruppe: | 530 Physik |
Normierte Schlagwörter: | Poröser Stoff, Modellierung, Dauerfrostboden, Mehrphasenströmung, Bodenphysik |
Freie Schlagwörter: | Permafrostsoil physics , multiphase transport , permafrost , model , porous medium |