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Influence of heterogeneous air entry pressure on large scale unsaturated flow in porous media |
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| Authors: | Adam Szymkiewicz Insa Neuweiler Rainer Helmig |
| Institution: | 1. Department of Geotechnics, Geology and Maritime Engineering, Gdańsk University of Technology, Gdańsk, Poland 2. Institute of Fluid Mechanics and Environmental Physics in Civil Engineering, Leibniz University Hannover, Hannover, Germany 3. Institute for Modelling Hydraulic and Environmental Systems, University of Stuttgart, Stuttgart, Germany |
| Abstract: | The paper presents numerical simulations of water infiltration in unsaturated porous media containing coarse-textured inclusions embedded in fine-textured background material. The calculations are performed using the two-phase model for water and air flow and a simplified model known as the Richards equation. It is shown that the Richards equation cannot correctly describe flow in the presence of heterogeneities. However, its performance can be improved by introducing appropriately defined effective capillary and permeability functions, representing largescale behaviour of the heterogeneous medium. |
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