[550] - 1D and 3D NMR Imaging of Water Content Changes in the Topmost Soil Layer During Evaporation

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Merz, S., 2012. 1D and 3D NMR Imaging of Water Content Changes in the Topmost Soil Layer During Evaporation. PhD Report, Institute of Bio- and Geosciences (IBG-3), Research Center Jülich, Jülich, Germany. Accessed from http://www.tr32db.uni-koeln.de/data.php?dataID=550 at 2019-04-25.
Title(s):Main Title: 1D and 3D NMR Imaging of Water Content Changes in the Topmost Soil Layer During Evaporation
Description(s):Abstract: Evaporative drying of porous media involves complex pore scale transport mechanisms and can be formally divided into two stages. Early stage (stage I), close to the potential evaporation rate is mainly supplied by capillary ow from the drying front to the surface. Especially in the topmost soil layer water content and hydraulic conductivity may change strongly, resulting in disrupted capillary continuity marking the onset of a vapor driven evaporative ux through the dry layer (stage II). The objective of last year's work was to investigate water content changes in sand soil columns under approximately isothermal conditions by means of NMR relaxation and imaging. Suitability of 1D CPMG relaxation, single point imaging (SPI3D) and spin echo multi slice (SEMS) 3D imaging measurements were tried and tested to determine the drying front at the transition to stage II. Additionally, 1D GPR/NMR experiment on a sandbox were set up and tested. Measurements show that NMR imaging is feasible to determine drying front depth at onset of stage II evaporation what corresponds well to the work of Lehmann et al. 2008 .
Responsible Party
Creator(s):Author: Steffen Merz
Publisher:CRC/TR32 Database (TR32DB)
TR32 Topic:Soil
Subject(s):CRC/TR32 Keywords: PhD Report, NMR
File Details
File Name:Report2_Merz_2012.pdf
Data Type:Text
File Size:2744 kB (2.68 MB)
Date(s):Available: 2012-09-30
Mime Type:application/pdf
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
North:-no map data
Measurement Region:Laboratory
Measurement Location:--Laboratory--
Specific Informations - Report
Report Date:30th of September, 2012
Report Type:PhD Report
Report City:Jülich, Germany
Report Institution:Institute of Bio- and Geosciences (IBG-3), Research Center Jülich
Number Of Pages:18
Period of Pages:1 - 18
Further Informations:TR32 Student Report Phase II
Metadata Details
Metadata Creator:Steffen Merz
Metadata Created:2013-10-31
Metadata Last Updated:2013-10-31
Funding Phase:2
Metadata Language:English
Metadata Version:V40
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