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A New Formulation to Compute Self-potential Signals Associated with Ground Water Flow : Volume 4, Issue 3 (08/06/2007)

By Bolève, A.

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Book Id: WPLBN0003979068
Format Type: PDF Article :
File Size: Pages 35
Reproduction Date: 2015

Title: A New Formulation to Compute Self-potential Signals Associated with Ground Water Flow : Volume 4, Issue 3 (08/06/2007)  
Author: Bolève, A.
Volume: Vol. 4, Issue 3
Language: English
Subject: Science, Hydrology, Earth
Collections: Periodicals: Journal and Magazine Collection (Contemporary), Copernicus GmbH
Historic
Publication Date:
2007
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications

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Janod, F., Mattiuzzo, J. L., Revil, A., Jardani, A., & Bolève, A. (2007). A New Formulation to Compute Self-potential Signals Associated with Ground Water Flow : Volume 4, Issue 3 (08/06/2007). Retrieved from http://worldebookfair.com/


Description
Description: CNRS-CEREGE, Université Paul Cézanne, Aix-en-Provence, France. The classical formulation of the coupled hydroelectrical flow in porous media is based on a linear formulation of two coupled constitutive equations for the electrical current density and the seepage velocity of the water phase and obeying Onsager's reciprocity. This formulation shows that the streaming current density is controlled by the gradient of the fluid pressure of the water phase and a streaming current coupling coefficient that depends on the so-called zeta potential. Recently a new formulation has been introduced in which the streaming current density is directly connected to the seepage velocity of the water phase and to the excess of electrical charge per unit pore volume in the porous material. The advantages of this formulation are numerous. First this new formulation is more intuitive not only in terms of constitutive equation for the generalized Ohm's law but also in specifying boundary conditions for the influence of the flow field upon the streaming potential. With the new formulation, the streaming potential coupling coefficient shows a decrease of its magnitude with permeability in agreement with published results. The new formulation is also easily extendable to non-viscous laminar flow problems (high Reynolds number ground water flow in cracks for example) and to unsaturated conditions with applications to the vadose zone. We demonstrate here that this formulation is suitable to model self-potential signals in the field. We investigate infiltration of water from an agricultural ditch, vertical infiltration of water into a sinkhole, and preferential horizontal flow of ground water in a paleochannel. For the three cases reported in the present study, a good match is obtained between the finite element simulations performed with the finite element code Comsol Multiphysics 3.3 and field observations. Finally, this formulation seems also very promising for the inversion of the geometry of ground water flow from the monitoring of self-potential signals.

Summary
A new formulation to compute self-potential signals associated with ground water flow

Excerpt
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