Determination of the distribution of air and water in porous media by electrical impedance tomography and magneto-electrical imaging
| Autor: | Egon Zimmermann, Harry Vereecken, K. Breede, Franz-Hubert Haegel, Odilia Esser, Joachim Berwix, Walter Glaas, Johan Alexander Huisman |
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| Rok vydání: | 2011 |
| Předmět: |
Nuclear and High Energy Physics
Materials science Spectral induced polarisation Mechanical Engineering Soil science Induced polarization Infiltration (hydrology) Nuclear Energy and Engineering Electrical resistivity and conductivity Vadose zone General Materials Science Geotechnical engineering ddc:620 Safety Risk Reliability and Quality Porous medium Waste Management and Disposal Water content Electrical impedance tomography |
| Zdroj: | Nuclear engineering and design 241, 1959-1969 (2011). doi:10.1016/j.nucengdes.2010.09.011 |
| ISSN: | 0029-5493 |
| DOI: | 10.1016/j.nucengdes.2010.09.011 |
| Popis: | Monitoring the distribution of water content is essential for understanding hydrological processes in the lithosphere and the pedosphere. The movement of water in unsaturated rock formations and in the vadose zone is influenced by different processes (mainly infiltration, evaporation, percolation and capillary flow) which may be rate determining depending on the actual conditions. The interdependence of these processes also strongly influences the transport and distribution of solutes in the pore space. In order to gain a better understanding of the movement and distribution of water in unsaturated media, systematic investigations with non-invasive or minimal invasive methods appear to be most suitable. Studies on the distribution of electrical conductivity can improve risk analysis concerning waste disposals in general and nuclear waste repositories in particular. Induced polarization and magnetic flux density determined with two highly sensitive accessories yield additional information and may allow for better discrimination of coupled flow processes. Electrical impedance tomography (Err) with 20 current injection and 48 voltage electrodes was used here to monitor the evaporation of tap water from a container filled with sand under laboratory conditions at 20 degrees C. The results are compared with data obtained by determining spectral induced polarization (SIP) of sand during desaturation in a multi-step outflow equipment. Infiltration processes and evaporation from sand saturated with 0.01 M CaCl2 were determined by magneto-electrical resistivity imaging technique (MERIT). The results were obtained from a long-term experiment under controlled conditions. (C) 2010 Elsevier B.V. All rights reserved. |
| Databáze: | OpenAIRE |
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