Electrical anisotropy for the characterization of preferential flow in soil
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| Title: | Main Title: Electrical anisotropy for the characterization of preferential flow in soil |
| Description: | Abstract: Evaluation of potential environmental contamination is an important societal concern. Preferential flow in macropores can lead to rapid transport of contaminants (e.g. pesticides and nutrients) through the vadose zone to the groundwater. Unfortunately, very few easurement methods provide insights into these preferential flow processes. The objective of this study is to evaluate whether the anisotropy of the electrical resistivity can be used to identify the existence of flow in macropores and to characterize the exchange between macropores and bulk soil. In order to do so, infiltration into a soil column with an artificial macropore was simulated using the HYDRUS software package that solves the pseudo three-dimensional axisymmetric Richards equation. The simulated temporal development of the resistivity anisotropy was obtained by solving the Poisson equation in MATLAB after converting the simulated water content distributions to electrical resistivity distributions. The simulation results clearly showed that preferential flow in the macropore led to anisotropy in the electrical resistivity because horizontal and vertical resistivity reacted differently to macropore flow processes. To verify these simulation results in the laboratory, we measured the temporal dynamics of the anisotropy in resistivity during water infiltration into a soil column of 9 cm diameter and 40 cm length with an artificial macropore of 2 cm diameter in the center of the column. The first experimental results confirmed that the general behavior observed in the simulations and give confidence that the anisotropy in electrical resistivity can indeed be used to identify and perhaps even quantify macropore flow. |
Responsible Party
| Creator: | Sadam Al-Hazaimay (Author) |
| Publisher: | CRC/TR32 Database (TR32DB) |
| Publication Year: | 2013 |
Topic
| TR32 Topic: | Soil |
| Related Subproject: | A3 |
| Subject: | Keyword: PhD Report |
File Details
| Filename: | Report4_AlHazaimay_2012.pdf |
| Data Type: | Text - Text |
| File Size: | 2.8 MB |
| Date: | Available: 01.04.2012 |
| 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 |
Geographic
Specific Information - Report
| Report Date: | 1st of April, 2012 |
| Report Type: | PhD Report |
| Report City: | Jülich, Germany |
| Report Institution: | Institute of Bio- and Geosciences (Agrosphere-IBG3), Research Center Jülich |
| Number of Pages: | 11 (1 - 11) |
| Further Information: | TR32 Student Report Phase II |
Metadata Details
| Metadata Creator: | Sadam Al-Hazaimay |
| Metadata Created: | 19.11.2013 |
| Metadata Last Updated: | 19.11.2013 |
| Subproject: | A3 |
| Funding Phase: | 2 |
| Metadata Language: | English |
| Metadata Version: | V50 |
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| Page Visits: | 763 |
| Metadata Downloads: | 0 |
| Dataset Downloads: | 1 |
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