[1122] - Numerical Study of Prepolarized Surface Nuclear Magnetic Resonance in the Vadose Zone

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de Pasquale, G., Mohnke, O., 2014. Numerical Study of Prepolarized Surface Nuclear Magnetic Resonance in the Vadose Zone. Vadose Zone Journal, 13 (11), 1 - 9. DOI: 10.2136/vzj2014.06.0069.
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Title(s):Main Title: Numerical Study of Prepolarized Surface Nuclear Magnetic Resonance in the Vadose Zone
Description(s):Abstract: Surface nuclear magnetic resonance (SNMR) is a geophysical technique for water exploration in the shallow subsurface. To investigate the vadose zone, it is necessary to increase the method sensitivity; therefore we developed a new approach for SNMR experiments. Adapted from laboratory applications, an artificial static magnetic prepolarizing (Px) field is superimposed on the Earth’s magnetic field to enhance the equilibrium magnetization of the pore water and thus to increase the SNMR sounding signals. We numerically investigated the basic feasibility of this approach by modeling the relevant static and oscillating magnetic fields and resulting SNMR responses. Configuration parameters, e.g., current intensities, loop sizes, and layouts, were optimized by numerical simulations. The most feasible field layouts comprised two Px loops symmetrically arrayed with respect to the transmitter/receiver (Tx/Rx) antennae or a single Px loop with its radius approximately three times larger than the respective Tx/Rx loops, thus yielding a 10-fold increase of the recorded signals compared with conventional SNMR. Eventually, we simulated synthetic sounding curves obtained from a water body layer at various depths and thicknesses, concluding that in the shallowest subsurface, the use of two loops to enhance the signal is more effective than a single antenna, but the results deteriorate for deeper water layers.
Identifier(s):DOI: 10.2136/vzj2014.06.0069
Responsible Party
Creator(s):Author: Giulia de Pasquale
Author: Oliver Mohnke
Publisher:Soil Science Society of America
TR32 Topic:Soil
Subject(s):CRC/TR32 Keywords: NMR, Vadose Zone, Numerical Simulation
File Details
File Name:2014_de_Pasquale_VZJ.pdf
Data Type:Text
Size(s):9 Pages
File Size:1881 kB (1.837 MB)
Date(s):Available: 2014-11-10
Mime Type:application/pdf
Data Format: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:None
Measurement Location:--None--
Specific Informations - Publication
Article Type:Journal
Source:Vadose Zone Journal
Number Of Pages:9
Page Range:1 - 9
Metadata Details
Metadata Creator:Tanja Kramm
Metadata Created:2014-12-04
Metadata Last Updated:2014-12-04
Funding Phase:2
Metadata Language:English
Metadata Version:V40
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