{"id":{"repo_id":"heid-diss","oai_identifier":"oai:archiv.ub.uni-heidelberg.de:1872"},"canonical_url":"https://search.dev.ndltd.org/etd/heid-diss/oai:archiv.ub.uni-heidelberg.de:1872","repository":{"repo_id":"heid-diss","name":"Universität Heidelberg","base_url":"http://archiv.ub.uni-heidelberg.de/volltextserver/cgi/oai2"},"display":{"title":"Coupled transport in natural porous media","abstract":"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.","abstract_html":"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.","abstract_has_math":false,"creators":["Ippisch, Olaf"],"institution":"Universität Heidelberg","degree_name":null,"degree_level":"thesis.doctoral","degree_discipline":null,"degree_department":null,"school":null,"contributors":["Roth, Kurt"],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2001,"date_issued":"2001-12-19","date_published":"2001-12-19","updated_at":"2026-07-24T02:29:09Z","subjects":[],"languages":[],"rights":[],"rights_urls":[],"identifier_entries":[]},"links":{"outbound_url":"http://www.ub.uni-heidelberg.de/archiv/1872","outbound_label":"Repository record","outbound_source":"source_url"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Roth, Kurt"]},{"key":"dc:creator","label":"Author","values":["Ippisch, Olaf"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:publisher","label":"Institution","values":["Universitätsbibliothek Heidelberg"]},{"key":"dc:type","label":"Dc Type","values":["doctoralThesis"]},{"key":"thesis:degree_level","label":"Degree Level","values":["thesis.doctoral"]},{"key":"thesis:institution_name","label":"Thesis Institution Name","values":["Universität Heidelberg"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description.abstract","label":"Abstract","values":["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."]},{"key":"dc:format.medium","label":"Dc Format Medium","values":["application/pdf"]},{"key":"dc:title","label":"Title","values":["Coupled transport in natural porous media","Gekoppelte Transportprozesse in natürlichen porösen Medien"]}]}],"canonical_facts":{"dc:contributor":["Roth, Kurt"],"dc:creator":["Ippisch, Olaf"],"dc:description.abstract":["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."],"dc:format.medium":["application/pdf"],"dc:publisher":["Universitätsbibliothek Heidelberg"],"dc:title":["Coupled transport in natural porous media","Gekoppelte Transportprozesse in natürlichen porösen Medien"],"dc:type":["doctoralThesis"],"thesis:degree_level":["thesis.doctoral"],"thesis:institution_name":["Universität Heidelberg"]},"updated_at":"2026-07-24T02:29:09Z"}