Numerical Study of Prepolarized Surface Nuclear Magnetic Resonance in the Vadose Zone
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| Title: | Main Title: Numerical Study of Prepolarized Surface Nuclear Magnetic Resonance in the Vadose Zone |
| Description: | 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: | 10.2136/vzj2014.06.0069 (DOI) |
Responsible Party
| Creators: | Giulia de Pasquale (Author), Oliver Mohnke (Author) |
| Publisher: | Soil Science Society of America |
| Publication Year: | 2014 |
Topic
| TR32 Topic: | Soil |
| Related Subproject: | A2 |
| Subjects: | Keywords: NMR, Vadose Zone, Numerical Simulation |
File Details
| Filename: | 2014_de_Pasquale_VZJ.pdf |
| Data Type: | Text - Article |
| Size: | 9 Pages |
| File Size: | 1.8 MB |
| Date: | Available: 10.11.2014 |
| Mime Type: | application/pdf |
| Data Format: | |
| Language: | English |
| Status: | Completed |
Constraints
| 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: | Vadose Zone Journal |
| Source Website: | https://www.soils.org |
| Issue: | 11 |
| Volume: | 13 |
| Number of Pages: | 9 (1 - 9) |
Metadata Details
| Metadata Creator: | Tanja Kramm |
| Metadata Created: | 04.12.2014 |
| Metadata Last Updated: | 04.12.2014 |
| Subproject: | A2 |
| Funding Phase: | 2 |
| Metadata Language: | English |
| Metadata Version: | V50 |
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| Page Visits: | 954 |
| Metadata Downloads: | 0 |
| Dataset Downloads: | 1 |
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