Using electrical anisotropy for sub-scale structural characterization of sediments: an experimental validation study

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Title:Main Title: Using electrical anisotropy for sub-scale structural characterization of sediments: an experimental validation study
Description:Abstract: Flow and transport processes in soils are directly linked with soil structural and textural heterogeneity. Hydraulic properties of rocks and soils are important for better understanding the exchange processes in the soil and between the soil, vegetation and atmosphere. Our goal is to experimentally validate the theoretical findings of Winchen et al. (2009). First, we re-produced their findings by calculating the effective complex resistivity of 2D bimodal facies distributions for two materials in two perpendicular directions. Then, we constructed a bimodal distribution in a 2D measurement cell and applied a superpositioning of a set of current injections and voltage measurements to estimate the effective complex resistivity. The measurements were performed using a Electrical Impedance Tomography (EIT) system at frequencies ranging from mHz to kHz. Numerically, we confirmed that the anisotropy in effective complex resistivity of 2D bimodal facies distributions can be used to obtain information on sub-scale heterogeneity. However, we were not able yet to back-up our theoretical results with experimental evidence. The experimental results obtained with the superpositioning method resulted in an effective resistivity magnitude outside the limits provided by the individual responses of the two materials, which is physically not possible. This disagreement in our method was caused by two reasons: i) non-constant current was injected in the measurements which differs from the constant current injection used in the simulations and ii) it is not possible to measure the potential at locations of the current injection. We are currently working on approaches to account for these shortcomings of the superpositioning method.
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:Report3_AlHazaimay_2011.pdf
Data Type:Text - Text
File Size:958 KB
Date:Available: 29.09.2011
Mime Type:application/pdf
Data Format:PDF (3)
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, 2011
Report Type:PhD Report
Report City:Jülich, Germany
Report Institution:Institute of Bio- and Geosciences (Agrosphere-IBG3), Research Center Jülich
Number of Pages:17 (1 - 17)
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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