A comparison of spectral electrical properties of undisturbed and packed sedimentary soil samples
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| Titles: | Main Title: A comparison of spectral electrical properties of undisturbed and packed sedimentary soil samples Alternative Title: 6th report |
| Description: | Abstract: Spectral complex electrical properties of soils are associated to the interfacial properties of the soils. Therefore measurement as well as imaging of the spectral complex electrical properties can give valuable information for characterization of soils in terms of hydraulic conductivity. However it is well established, that for a good characterization a site-specific calibration of the relationships between spectral complex electrical properties and hydraulic conductivity is needed. Most of the studies, investigating this relationship so far focused on sandstone aquifers but in recent years also the characterization of sedimentary soils using measurements of the spectral complex electrical properties received considerable attention. As the spectral complex electrical properties are strongly dependent on the structure of the pore space, the preparation of the samples, i.e. packing procedure should have an influence on the resulting measurements which may be dependent on the soil type and therefore on the calibration relationship as well. In this work the difference between spectral complex electrical properties of undisturbed and packed sedimentary soil samples of different soil types is investigated. Two different packing procedures are used and results are presented in terms of complex conductivity spectra, as well as integral spectral parameters, obtained by Debye-decomposition. Results show, that indeed packing has a strong influence on the spectral complex electrical soil properties which differed in strength for different soil types. The wet packing method consistently showed less polarization in the lower frequency range and a higher polarization in the higher frequency range compared to the undisturbed samples. The moist packing method in most cases seems to add some structure to the pore space, leading to a higher overall polarizability and a favoured relaxation time in the relaxation time distribution. We conclude, that the use of undisturbed samples is essential for any kind of quantitative calibration of relationships between spectral complex electrical and hydraulic properties, even though it means more effort in sampling. |
Responsible Party
| Creator: | Matthias Kelter (Author) |
| Publisher: | CRC/TR32 Database (TR32DB) |
| Publication Year: | 2015 |
Topic
| TR32 Topic: | Soil |
| Related Subproject: | A3 |
| Subject: | Keyword: PhD Report |
File Details
| Filename: | Kelter_2015.docx |
| Data Type: | Text - Text |
| File Size: | 2 MB |
| Date: | Submitted: 01.02.2015 |
| Mime Type: | application/vnd.openxmlformats-officedocument.wordprocessingml.document |
| Data Format: | MS word |
| 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, 2015 |
| Report Type: | PhD Report |
| Report City: | Jülich, Germany |
| Report Institution: | Institute of Bio- and Geosciences (IBG-3), Research Center Jülich |
| Further Information: | TR32 Student Report Phase II |
Metadata Details
| Metadata Creator: | Matthias Kelter |
| Metadata Created: | 15.09.2015 |
| Metadata Last Updated: | 15.09.2015 |
| Subproject: | A3 |
| Funding Phase: | 2 |
| Metadata Language: | English |
| Metadata Version: | V50 |
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| Page Visits: | 731 |
| Metadata Downloads: | 0 |
| Dataset Downloads: | 1 |
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