Imaging of spectral electrical properties of variably saturated porous media using EIT
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| Title: | Main Title: Imaging of spectral electrical properties of variably saturated porous media using EIT |
| Description: | Abstract: Accurate knowledge about the spatial distribution of hydraulic properties in the subsoil are of great importance for any kind of hydrological modeling. Geophysical methods are able to provide high resolution images of physical properties in the soil which can be related to hydraulic properties. One of these techniques, electrical impedance tomography (EIT) images the complex electrical resistivity distribution in the ground. In recent literature it has been shown, that spectral electrical properties can be related to hydraulic properties of saturated and partially saturated soils and rocks. As EIT can be performed also in a spectral manner (i.e. for a number of specified frequencies) spectral electrical parameters can be imaged by using this method which then allows for imaging unsaturated hydraulic properties. In this study a first measurement series was performed on a variably saturated artificial sand column and the obtained electrical images are shown for an exemplary frequency and several hydraulic states. Our results show, that with decreasing saturation, the phase angle of complex electrical conductivity increases, which is constistent with spectroscopic results in literature. Furthermore, our results indicate a maximum of the phase angle of complex electrical conductivity in the low frequency range for a critical saturation or matric potential. The measured and inverted spectra did not show a significant frequency dependence of complex electrical resistivity in the investigated frequency band, ranging from 80 mHz to 100 Hz, which is in agreement with our expectations for the used artificial soil and with recent literature. |
Responsible Party
| Creator: | Matthias Kelter (Author) |
| Publisher: | CRC/TR32 Database (TR32DB) |
| Publication Year: | 2013 |
Topic
| TR32 Topic: | Soil |
| Related Subproject: | A3 |
| Subject: | Keyword: PhD Report |
File Details
| Filename: | Report2_Kelter_2013.pdf |
| Data Type: | Text - Text |
| File Size: | 962 KB |
| Date: | Available: 01.02.2013 |
| 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 - Report
| Report Date: | 1st of February, 2013 |
| Report Type: | PhD Report |
| Report City: | Jülich, Germany |
| Report Institution: | Institute of Bio- and Geosciences (IBG-3), Research Center Jülich |
| Number of Pages: | 20 (1 - 20) |
| Further Information: | TR32 Student Report Phase II |
Metadata Details
| Metadata Creator: | Matthias Kelter |
| Metadata Created: | 18.11.2013 |
| Metadata Last Updated: | 18.11.2013 |
| Subproject: | A3 |
| Funding Phase: | 2 |
| Metadata Language: | English |
| Metadata Version: | V50 |
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| Page Visits: | 739 |
| Metadata Downloads: | 0 |
| Dataset Downloads: | 0 |
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