Investigating Preferential Flow Processes in Soils using Anisotropy in Electrical Resistivity

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Title:Main Title: Investigating Preferential Flow Processes in Soils using Anisotropy in Electrical Resistivity
Description:Abstract: Macropores occupy only a small volume fraction of the pore space in the vadose zone. However, water and solutes can quickly bypass the vadose zone through these macropores in a process known as macropore preferential flow. In the last few decades, many efforts were made to improve understanding of macropore preferential flow processes. Unfortunately, very few measurement methods provide insights into these preferential flow processes. In this context, the objective of this study is to evaluate whether anisotropy in electrical resistivity can be used to identify the existence of flow in macropores and perhaps even to characterize the exchange between macropores and bulk soil. In order to do so, simulations and experiments were performed for infiltration in a soil column with an artificial macropore. In a first step, the HYDRUS software package was used to simulate 3D water content distribution associated with infiltration into the artificial macropore. Next, 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 results showed that both horizontal and vertical resistivity decreased strongly due to infiltration. However, the vertical and horizontal resistivity reacted differently because of the presence of the conductive (‘activated’) macropore, which led to anisotropy in the resistivity. As soon as infiltration into the macropore stopped, water re-distributed from the macropore to the matrix domain and the contrast in horizontal and vertical electrical resistivity decreased within the column. To verify the simulation results, we also measured the temporal dynamics of the anisotropy in resistivity during water infiltration. The experimental results confirmed 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:Report5_AlHazaimay_2013.pdf
Data Type:Text - Text
File Size:614 KB
Date:Available: 29.09.2013
Mime Type:application/pdf
Data Format:PDF
Language:English
Status:Completed
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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:29th of September, 2013
Report Type:PhD Report
Report City:Jülich, Germany
Report Institution:Institute of Bio- and Geosciences (Agrosphere-IBG3), Research Center Jülich
Number of Pages:22 (1 - 22)
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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