An effective excess charge model to describe hysteresis effects on streaming potential

Streaming potentials are produced by the coupling between the water flow and the electrical current generated by the drag of electrical charges within the pore water of the media. This electrokinetic coupling is strongly influenced by the hydraulic properties that control groundwater flow (permeabil...

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Detalles Bibliográficos
Autores principales:	Soldi, Mariangeles, Guarracino, Luis, Jougnot, Damien
Formato:	Articulo Preprint
Lenguaje:	Inglés
Publicado:	2020
Materias:	Geofísica Hydrogeophysics Streaming potential Hysteresis Vadose zone
Acceso en línea:	http://sedici.unlp.edu.ar/handle/10915/127887
Aporte de:	SEDICI (UNLP) de Universidad Nacional de La Plata

id	I19-R120-10915-127887
record_format	dspace
institution	Universidad Nacional de La Plata
institution_str	I-19
repository_str	R-120
collection	SEDICI (UNLP)
language	Inglés
topic	Geofísica Hydrogeophysics Streaming potential Hysteresis Vadose zone
spellingShingle	Geofísica Hydrogeophysics Streaming potential Hysteresis Vadose zone Soldi, Mariangeles Guarracino, Luis Jougnot, Damien An effective excess charge model to describe hysteresis effects on streaming potential
topic_facet	Geofísica Hydrogeophysics Streaming potential Hysteresis Vadose zone
description	Streaming potentials are produced by the coupling between the water flow and the electrical current generated by the drag of electrical charges within the pore water of the media. This electrokinetic coupling is strongly influenced by the hydraulic properties that control groundwater flow (permeability, saturation and pressure head). Under unsaturated conditions, hydrogeologic studies have widely established that the relationships of permeability and saturation with pressure head are different for drainage and imbibition experiments. The hysteresis phenomenon present on these properties produces a hysteretic behaviour on the streaming potential which has been recently observed in experimental data. Hysteresis can be explained by the presence of irregularities in the pore geometry of the media which affects the water flow and, therefore, the excess charge density that is effectively dragged by the flow. In this study, we present a physically-based analytical model to describe the hysteresis phenomenon in the estimates of the effective excess charge density. Under the assumptions of a porous medium represented by a bundle of tortuous capillary tubes with throats and a fractal pore size distribution, hysteretic curves are obtained for the effective excess charge density as a function of pressure head using a flux averaging technique. These analytical expressions are closed-form and depend on the medium petrophysical and chemical properties. The predictions of the proposed model are consistent with laboratory data from drainage-imbibition experiments. These results open up exciting possibilities for studies involving water movement and processes in the vadose zone.
format	Articulo Preprint
author	Soldi, Mariangeles Guarracino, Luis Jougnot, Damien
author_facet	Soldi, Mariangeles Guarracino, Luis Jougnot, Damien
author_sort	Soldi, Mariangeles
title	An effective excess charge model to describe hysteresis effects on streaming potential
title_short	An effective excess charge model to describe hysteresis effects on streaming potential
title_full	An effective excess charge model to describe hysteresis effects on streaming potential
title_fullStr	An effective excess charge model to describe hysteresis effects on streaming potential
title_full_unstemmed	An effective excess charge model to describe hysteresis effects on streaming potential
title_sort	effective excess charge model to describe hysteresis effects on streaming potential
publishDate	2020
url	http://sedici.unlp.edu.ar/handle/10915/127887
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bdutipo_str	Repositorios
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An effective excess charge model to describe hysteresis effects on streaming potential

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