Download or read book Effects of Electro Kinetic Coupling on the Measurement of Hydraulic Conductivity written by AT. Yeung and published by . This book was released on 1994 with total page 17 pages. Available in PDF, EPUB and Kindle. Book excerpt: Hydraulic conductivity is the proportionality constant relating the volume flow rate of a fluid through a porous medium to the imposed hydraulic gradient. Hence, there should not be any gradient or driving force other than a hydraulic gradient imposed on the sample during the measurement of the parameter. However, no precaution is taken to prevent the development of a streaming potential during the experiment. As a result, an electrical gradient is always generated across the sample and the measured hydraulic flow volumes are actually induced by the combined hydraulic and electrical gradients. The effects of electro-kinetic coupling are more pronounced in fine-grained soil. Moreover, the measured conductivity coefficient cannot be used in coupled flow equations to quantify the hydraulic volume flow rate contributed by the hydraulic gradient without appropriate corrections. This paper attempts to present the results of the theoretical analysis and experimental evaluation of the effects of electro-kinetic coupling in the measurement of hydraulic conductivity.
Download or read book Hydraulic Conductivity and Waste Contaminant Transport in Soil written by David Edwin Daniel and published by ASTM International. This book was released on 1994 with total page 617 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Estimation of the Electrokinetic Coupling Coefficient and Hydraulic Conductivity from Streaming Potential Measurements in a Falling head Permeameter written by and published by . This book was released on 2012 with total page 14 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book IUTAM Symposium on Physicochemical and Electromechanical Interactions in Porous Media written by Jacques Huyghe and published by Springer Science & Business Media. This book was released on 2006-01-28 with total page 373 pages. Available in PDF, EPUB and Kindle. Book excerpt: In the last decades, new experimental and numerical techniques have taken many advanced features of porous media mechanics down to practical engineering applications. This happened in areas that sometimes were not even suspected to be open to engineering ideas at all. The challenge that often faces engineers in the field of geomechanics, biomechanics, rheology and materials science is the translation of ideas existing in one field to solutions in the other. The purpose of the IUTAM symposium from which this proceedings volume has been compiled was to dive deep into the mechanics of those porous media that involve mechanics and chemistry, mechanics and electromagnetism, mechanics and thermal fluctuations of mechanics and biology. The different sections have purposely not been formed according to field interest, but on the basis of the physics involved.
Download or read book Estimation of Hydraulic Conductivity Based on HK hydro kinetic and EHK electro hydro kinetic Coupled Mechanisms written by Jinwon Kim and published by . This book was released on 2010 with total page 392 pages. Available in PDF, EPUB and Kindle. Book excerpt: The main objective of this study is to develop new techniques to estimate the hydraulic conductivity of soils based on two coupled mechanisms. The first is the HK (Hydro-Kinetic) coupled mechanism formulated by Biot (1956 a, b). The second is the EHK (Electro-Hydro-Kinetic) coupled mechanism formulated by Pride (1994). Based on the HK coupled mechanism for dynamic behavior of soils, a characteristic frequency is a specific frequency at which the viscous coupling and inertial damping is about the same. Dynamic excitation causes the dynamic flow between solid particles and pore water; therefore, the characteristic frequency has information to estimate the hydraulic conductivity of saturated soils. In this experimental study, attenuation-based and velocity-based measurements are conducted to obtain the characteristic frequency using two sandy soils, (QUIKRETE and Ottawa sand) and two sand/bentonite mixtures (QUIKRETE sand/bentonite and Ottawa sand/bentonite mixture). From the saturated specimens, the distinct characteristic frequency is measured from the 1/Q versus frequency and the velocity versus frequency curves. The computed hydraulic conductivity based on Biot's (1956 a, b) simplified macroscopic equation using the acoustic techniques shows comparable results with the conventional laboratory test results. In addition to the HK coupled mechanism, a new method of dynamic measurement to estimate the hydraulic conductivity is studied using the EHK (Electro-Hydro-Kinetic) coupled mechanism. The potential of direct estimation of hydraulic conductivity using EHK was proposed by Pride (1994), Haartsen and Pride (1994), and Haartsen (1995). Using the dynamic impact force, the seismoelectric conversion is induced, which is measured by two electrodes. Using two sandy soils, (QUIKRETE and Ottawa sand), and five different soil mixtures, the relations between the general soil properties and amplitudes of the seismoelectric conversion are studied. Finally, a relation between the hydraulic conductivity and measured amplitudes of the seismoelectric conversion is compared to the theoretical predictions addressed by Pride (1994) and Haartsen (1995). Based on this study, the acoustic technique is a new tool for estimating the hydraulic conductivity of sandy and silt sandy soils. In addition, the EHK coupled mechanism proved to be a possible new testing method to measure dynamic soil properties.
Download or read book Hydraulic Conductivity written by Lakshmanan Elango and published by BoD – Books on Demand. This book was released on 2011-11-23 with total page 450 pages. Available in PDF, EPUB and Kindle. Book excerpt: There are several books on broad aspects of hydrogeology, groundwater hydrology and geohydrology, which do not discuss in detail on the intrigues of hydraulic conductivity elaborately. However, this book on Hydraulic Conductivity presents comprehensive reviews of new measurements and numerical techniques for estimating hydraulic conductivity. This is achieved by the chapters written by various experts in this field of research into a number of clustered themes covering different aspects of hydraulic conductivity. The sections in the book are: Hydraulic conductivity and its importance, Hydraulic conductivity and plant systems, Determination by mathematical and laboratory methods, Determination by field techniques and Modelling and hydraulic conductivity. Each of these sections of the book includes chapters highlighting the salient aspects and most of these chapters explain the facts with the help of some case studies. Thus this book has a good mix of chapters dealing with various and vital aspects of hydraulic conductivity from various authors of different countries.
Download or read book Trace Elements in the Environment written by M.N.V. Prasad and published by CRC Press. This book was released on 2005-10-14 with total page 746 pages. Available in PDF, EPUB and Kindle. Book excerpt: New analytical techniques have enhanced current understanding of the behavior of trace and ultratrace elements in the biogeochemical cycling, chemical speciation, bioavailability, bioaccumulation, and as applied to the phytoremediation of contaminated soils. Addressing worldwide regulatory, scientific, and environmental issues, Trace Elements in th
Download or read book Estimation of Hydraulic Conductivity Based on HK hydro kinetic and EHK electro hydro kinetic Coupled Mechanisms written by Jinwon Kim and published by . This book was released on 2010 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The main objective of this study is to develop new techniques to estimate the hydraulic conductivity of soils based on two coupled mechanisms. The first is the HK (Hydro-Kinetic) coupled mechanism formulated by Biot (1956 a, b). The second is the EHK (Electro-Hydro-Kinetic) coupled mechanism formulated by Pride (1994). Based on the HK coupled mechanism for dynamic behavior of soils, a characteristic frequency is a specific frequency at which the viscous coupling and inertial damping is about the same. Dynamic excitation causes the dynamic flow between solid particles and pore water; therefore, the characteristic frequency has information to estimate the hydraulic conductivity of saturated soils. In this experimental study, attenuation-based and velocity-based measurements are conducted to obtain the characteristic frequency using two sandy soils, (QUIKRETE and Ottawa sand) and two sand/bentonite mixtures (QUIKRETE sand/bentonite and Ottawa sand/bentonite mixture). From the saturated specimens, the distinct characteristic frequency is measured from the 1/Q versus frequency and the velocity versus frequency curves. The computed hydraulic conductivity based on Biot's (1956 a, b) simplified macroscopic equation using the acoustic techniques shows comparable results with the conventional laboratory test results. In addition to the HK coupled mechanism, a new method of dynamic measurement to estimate the hydraulic conductivity is studied using the EHK (Electro-Hydro-Kinetic) coupled mechanism. The potential of direct estimation of hydraulic conductivity using EHK was proposed by Pride (1994), Haartsen and Pride (1994), and Haartsen (1995). Using the dynamic impact force, the seismoelectric conversion is induced, which is measured by two electrodes. Using two sandy soils, (QUIKRETE and Ottawa sand), and five different soil mixtures, the relations between the general soil properties and amplitudes of the seismoelectric conversion are studied. Finally, a relation between the hydraulic conductivity and measured amplitudes of the seismoelectric conversion is compared to the theoretical predictions addressed by Pride (1994) and Haartsen (1995). Based on this study, the acoustic technique is a new tool for estimating the hydraulic conductivity of sandy and silt sandy soils. In addition, the EHK coupled mechanism proved to be a possible new testing method to measure dynamic soil properties.
Download or read book Canadian Geotechnical Journal written by and published by . This book was released on 1996 with total page 1122 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Coupled Hydrogeophysical Inversion for Soil Hydraulic Property Estimation from Time lapse Geophysical Data written by Cho Miltin Mboh and published by Forschungszentrum Jülich. This book was released on 2012 with total page 97 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Advances in Hydrogeology written by Phoolendra K. Mishra and published by Springer Science & Business Media. This book was released on 2013-04-16 with total page 214 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book represents different types of progress in hydrogeology, including conceptualization changes, different approaches to simulating groundwater flow and transport new hydrogeophysical methods. Each chapter extends or summarizes a recent development in hydrogeology, with forward-looking statements regarding the challenges and strengths that are faced. While the title and scope is broad, there are several sub-themes that connect the chapters. Themes include theoretical advances in conceptualization and modeling of hydrogeologic problems. Conceptual advances are further tempered by insights arising from observations from both field and laboratory work.
Download or read book Advances in Geophysical Methods Applied to Forensic Investigations written by Giovanni Leucci and published by Springer Nature. This book was released on 2020-05-07 with total page 308 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book provides a general introduction to the most important geophysical exploration methods and their application to forensic sciences. It describes physical principles, campaign procedures and processing, as well as interpretation techniques, while also highlighting new acquisition and data analysis procedures. A large section of the book is devoted to applications, from measurements to the interpretation of data. Further, the book shows how to design and perform a forensic survey, and offers guidance on selecting the best method for the problem at hand, and on selecting the best type of data acquisition and processing. Written in straightforward language and chiefly intended as an introductory text for students in several scientific fields, the book also offers a useful guide for specialists who want to expand their expertise in this fascinating discipline.
Download or read book Seismoelectric Exploration written by Niels Grobbe and published by John Wiley & Sons. This book was released on 2020-10-08 with total page 496 pages. Available in PDF, EPUB and Kindle. Book excerpt: Seismoelectric coupling and its current and potential future applications The seismoelectric method—the naturally-occurring coupling of seismic waves to electromagnetic fields—can provide insight into important properties of porous media. With a variety of potential environmental and engineering uses, as well as larger scale applications such as earthquake detection and oil and gas exploration, it offers a number of advantages over conventional geophysical methods. Seismoelectric Exploration: Theory, Experiments, and Applications explores the coupling between poroelastic and electromagnetic disturbances, discussing laboratory experiments, numerical modeling techniques, recent theoretical developments, and field studies. Volume highlights include: Physics of the seismoelectric effect at the microscale Governing equations describing coupled seismo-electromagnetic fields Examples of successful seismoelectric field experiments in different geological settings Current and potential applications of seismoelectric coupling Noise removal techniques for seismoelectric field measurements The American Geophysical Union promotes discovery in Earth and space science for the benefit of humanity. Its publications disseminate scientific knowledge and provide resources for researchers, students, and professionals.
Download or read book The Seismoelectric Method written by André Revil and published by John Wiley & Sons. This book was released on 2015-03-12 with total page 264 pages. Available in PDF, EPUB and Kindle. Book excerpt: The seismoelectric method consists of measuring electromagnetic signals associated with the propagation of seismic waves or seismic sources in porous media. This method is useful in an increasing number of applications, for example to characterize aquifers, contaminant plumes or the vadose zone. This book provides the first full overview of the fundamental concepts of this method. It begins with a historical perspective, provides a full explanation of the fundamental mechanisms, laboratory investigations, and the formulation of the forward and inverse problems. It provides a recent extension of the theory to two-phase flow conditions, and a new approach called seismoelectric beamforming. It concludes with a chapter presenting a perspective on the method. This book is a key reference for academic researchers in geophysics, environmental geosciences, geohydrology, environmental engineering and geotechnical engineering. It will also be valuable reading for graduate courses dealing with seismic wave propagation and related electromagnetic effects.
Download or read book Electrical Dispersion and Electrokinetic Phenomena in Clays written by Mohsen Mehran and published by . This book was released on 1971 with total page 370 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Chemical Osmosis in Natural Clayey Materials written by Thomas Jillerd Simon Keijzer and published by . This book was released on 2000 with total page 186 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Study of Electrokinetic Effects to Quantify Groundwater Flow written by and published by . This book was released on 1997 with total page 28 pages. Available in PDF, EPUB and Kindle. Book excerpt: An experimental study of electrokinetic effects (streaming potential) in earth materials was undertaken. The objective was to evaluate the measurement of electrokinetic effects as a method of monitoring and predicting the movement of groundwater, contaminant plumes, and other fluids in the subsurface. The laboratory experiments verified that the electrokinetic effects in earth materials are prominent, repeatable, and can be described well to first order by a pair of coupled differential equations.
