Coupled Transport in Natural Porous Media (2. rev. Ed.)

• Main Author: Ippisch, Olaf
• Format: Book
• Language: English
• Published: 2001
• Subjects: 550; 550 Earth sciences; permafrost
• Online Access: https://archiv.ub.uni-heidelberg.de/volltextserver/3220/; https://archiv.ub.uni-heidelberg.de/volltextserver/3220/1/coupled_transport_in_natural_porous_media.pdf; https://archiv.ub.uni-heidelberg.de/volltextserver/3220/2/erratum_et_addendum.pdf; https://doi.org/10.11588/heidok.00003220; https://nbn-resolving.org/urn:nbn:de:bsz:16-heidok-32208

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.