Effects of entrapped residual air bubbles on tracer transport in heterogeneous soil: Magnetic resonance imaging study

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Title:Main Title: Effects of entrapped residual air bubbles on tracer transport in heterogeneous soil: Magnetic resonance imaging study
Description:Abstract: Magnetic resonance imaging (MRI) was used to study the process of infiltration and solute transport in an undisturbed soil sample of coarse sandy loam. The sample was subjected to the recurrent ponded infiltration (RPI) experiment, which was carried out in order to assess the changes in the entrapped air volume and its impact on steady state flow rates and solute breakthrough. The main stages of the first and second experimental RPI runs were monitored using an MRI sequence that follows both water density and magnetic relaxation. In a steady state stage of each experimental run a nickel nitrate pulse was injected in order to visualize the solute breakthrough. Effluent from the sample was collected for chemical analysis and a breakthrough curve of the nickel was constructed. To obtain information about the soil structure and to reveal potential preferential pathways, the soil sample was scanned using computed tomography. The local nickel ion transport breakthrough was evaluated from MR images in a series of local observation points distributed along the selected preferential pathways. The preferential flow instability phenomenon with the emphasis on air bubble formation was shown by detecting a 60% decrease of the steady state infiltration rate. The detailed analyses of MRI measurements at observation points revealed air bubble formation, producing a flow rate decrease accompanied by redirection of nickel ion transport trajectories. By analyzing M0 maps it was found that the volumetric water content decrease was 2.2%.
Identifier:10.1016/j.orggeochem.2011.03.020 (DOI)
Responsible Party
Creators:Vladimira Jelinkova (Author), Michal Snehota (Author), Andreas Pohlmeier (Author), Dagmar van Dusschoten (Author), Milena Cislerova (Author)
Publisher:Elsevier
Publication Year:2014
Topic
TR32 Topic:Soil
Related Subproject:A1
Subjects:Keywords: MRI, Water Fluxes, Soil, soil Heterogeneity
File Details
Filename:Jelinkova_et_al_OG_2011.pdf
Data Type:Text - Article
Size:8 Pages
File Size:978 KB
Date:Available: 13.04.2013
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:According to the TR32DB data policy agreement.
Access Limitations:According to the TR32DB data policy agreement.
Licence:[TR32DB] Data policy agreement
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Specific Information - Publication
Publication Status:Published
Review Status:Peer reviewed
Publication Type:Article
Article Type:Journal
Source:Organic Geochemistry
Source Website:www.elsevier.com/locate/orggeochem
Volume:42
Number of Pages:8 (991 - 998)
Metadata Details
Metadata Creator:Tanja Kramm
Metadata Created:18.09.2014
Metadata Last Updated:18.09.2014
Subproject:A1
Funding Phase:2
Metadata Language:English
Metadata Version:V50
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