[560] - Electrical anisotropy for the characterization of preferential flow in soil

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Citation
Al-Hazaimay, S., 2012. Electrical anisotropy for the characterization of preferential flow in soil. PhD Report, Institute of Bio- and Geosciences (Agrosphere-IBG3), Research Center Jülich, Jülich, Germany. Accessed from https://www.tr32db.uni-koeln.de/data.php?dataID=560 at 2019-09-21.
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Identification
Title(s):Main Title: Electrical anisotropy for the characterization of preferential flow in soil
Description(s):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(s):Author: Sadam Al-Hazaimay
Publisher:CRC/TR32 Database (TR32DB)
Topic
TR32 Topic:Soil
Subject(s):CRC/TR32 Keywords: PhD Report
File Details
File Name:Report4_AlHazaimay_2012.pdf
Data Type:Text
File Size:2816 kB (2.75 MB)
Date(s):Available: 2012-04-01
Mime Type:application/pdf
Data Format:PDF
Language:English
Status:Completed
Constraints
Download Permission:OnlyTR32
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
North:-no map data
East:-
South:-
West:-
Measurement Region:Other
Measurement Location:--Other--
Specific Informations - 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
Period of Pages:1 - 11
Further Informations:TR32 Student Report Phase II
Metadata Details
Metadata Creator:Sadam Al-Hazaimay
Metadata Created:2013-11-19
Metadata Last Updated:2013-11-19
Subproject:A3
Funding Phase:2
Metadata Language:English
Metadata Version:V40
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Dataset Downloads:1
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