Determination of the distribution of air and water in porous media by electrical impedance tomography and magneto-electrical imaging

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*Title:*	Main Title: Determination of the distribution of air and water in porous media by electrical impedance tomography and magneto-electrical imaging
*Description:*	Abstract: 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 (EIT) 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 ◦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 0.01M CaCl2 were determined by magneto-electrical resistivity imaging technique (MERIT). The results were obtained from a long-term experiment under controlled conditions.
*Identifier:*	10.1016/j.nucengdes.2010.09.011 (DOI)

Responsible Party

*Creators:*	Franz-Hubert Haegel (Author), Egon Zimmermann (Author), Odilia Esser (Author), Katrin Breede (Author), Johan A. Huisman (Author), Walter Glaas (Author), Joachim Berwix (Author), Harry Vereecken (Author)
*Publisher:*	Elsevier
*Publication Year:*	2013

Topic

*TR32 Topic:*	Other
*Related Subproject:*	A3
*Subjects:*	Keywords: Water Content, Hydrology

File Details

*Filename:*	2011_Haegel_NED.pdf
*Data Type:*	Text - Article
*Size:*	11 Pages
*File Size:*	1.2 MB
*Date:*	Accepted: 10.08.2010
*Mime Type:*	application/pdf
*Data Format:*	PDF
*Language:*	English
*Status:*	Completed

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*Download Permission:*	Only Project Members
*General Access and Use Conditions:*	For internal use only
*Access Limitations:*	For internal use only
*Licence:*	[TR32DB] Data policy agreement

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*Publication Status:*	Published
*Review Status:*	Peer reviewed
*Publication Type:*	Article
*Article Type:*	Journal
*Source:*	Nuclear Engineering and Design
*Volume:*	241
*Number of Pages:*	11 (1959 - 1969)

Metadata Details

*Metadata Creator:*	Katrin Breede
*Metadata Created:*	02.12.2013
*Metadata Last Updated:*	02.12.2013
*Subproject:*	A3
*Funding Phase:*	2
*Metadata Language:*	English
*Metadata Version:*	V50

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