[1061] - Effects of entrapped residual air bubbles on tracer transport in heterogeneous soil: Magnetic resonance imaging study

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Citation
Jelinkova, V., Snehota, M., Pohlmeier, A., van Dusschoten, D., Cislerova, M., 2013. Effects of entrapped residual air bubbles on tracer transport in heterogeneous soil: Magnetic resonance imaging study. Organic Geochemistry, 42, 991 - 998. DOI: 10.1016/j.orggeochem.2011.03.020.
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Identification
Title(s):Main Title: Effects of entrapped residual air bubbles on tracer transport in heterogeneous soil: Magnetic resonance imaging study
Description(s):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(s):DOI: 10.1016/j.orggeochem.2011.03.020
Responsible Party
Creator(s):Author: Vladimira Jelinkova
Author: Michal Snehota
Author: Andreas Pohlmeier
Author: Dagmar van Dusschoten
Author: Milena Cislerova
Publisher:Elsevier
Topic
TR32 Topic:Soil
Subject(s):CRC/TR32 Keywords: MRI, Water Fluxes, Soil, soil Heterogeneity
File Details
File Name:Jelinkova_et_al_OG_2011.pdf
Data Type:Text
Size(s):8 Pages
File Size:978 kB (0.955 MB)
Date(s):Available: 2013-04-13
Mime Type:application/pdf
Data Format:PDF
Language:English
Status:Completed
Constraints
Download Permission:OnlyTR32
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
Geographic
North:-no map data
East:-
South:-
West:-
Measurement Region:Other
Measurement Location:--Other--
Specific Informations - Publication
Status:Published
Review:PeerReview
Year:2013
Type:Article
Article Type:Journal
Source:Organic Geochemistry
Volume:42
Number Of Pages:8
Page Range:991 - 998
Metadata Details
Metadata Creator:Tanja Kramm
Metadata Created:2014-09-18
Metadata Last Updated:2014-09-18
Subproject:A1
Funding Phase:2
Metadata Language:English
Metadata Version:V40
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Page Visits:413
Metadata Downloads:0
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