1D and 3D NMR Imaging of Water Content Changes in the Topmost Soil Layer During Evaporation
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| Title: | Main Title: 1D and 3D NMR Imaging of Water Content Changes in the Topmost Soil Layer During Evaporation |
| Description: | 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: | Steffen Merz (Author) |
| Publisher: | CRC/TR32 Database (TR32DB) |
| Publication Year: | 2013 |
Topic
| TR32 Topic: | Soil |
| Related Subproject: | A1 |
| Subjects: | Keywords: PhD Report, NMR |
File Details
| Filename: | Report2_Merz_2012.pdf |
| Data Type: | Text - Text |
| File Size: | 2.7 MB |
| Date: | Available: 30.09.2012 |
| Mime Type: | application/pdf |
| 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 |
Geographic
Specific Information - 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 (1 - 18) |
| Further Information: | TR32 Student Report Phase II |
Metadata Details
| Metadata Creator: | Steffen Merz |
| Metadata Created: | 31.10.2013 |
| Metadata Last Updated: | 31.10.2013 |
| Subproject: | A1 |
| Funding Phase: | 2 |
| Metadata Language: | English |
| Metadata Version: | V50 |
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| Page Visits: | 669 |
| Metadata Downloads: | 0 |
| Dataset Downloads: | 0 |
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