Electrical Resistivity Tomography
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Electrical Resistivity Tomography
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Author : Bing Zhou
language : en
Publisher:
Release Date : 2019
Electrical Resistivity Tomography written by Bing Zhou and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2019 with Electronic books categories.
Electrical resistivity tomography (ERT) is a popular geophysical subsurface-imaging technique and widely applied to mineral prospecting, hydrological exploration, environmental investigation and civil engineering, as well as archaeological mapping. This chapter offers an overall review of technical aspects of ERT, which includes the fundamental theory of direct-current (DC) resistivity exploration, electrode arrays for data acquisition, numerical modelling methods and tomographic inversion algorithms. The section of fundamental theory shows basic formulae and principle of DC resistivity exploration. The section of electrode arrays summarises the previous study on all traditional-electrode arrays and recommends 4 electrode arrays for data acquisition of surface ERT and 3 electrode arrays for cross-hole ERT. The section of numerical modelling demonstrates an advanced version of finite-element method, called Gaussian quadrature grid approach, which is advantageous to a numerical simulation of ERT for complex geological models. The section of tomographic inversion presents the generalised standard conjugate gradient algorithms for both the l1- and l2-normed inversions. After that, some synthetic and real imaging examples are given to show the near-surface imaging capabilities of ERT.
Electrical Resistivity Tomography In Cylindrical Cells Guidelines For Hardware Pre Design
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Author : J. Y. Lee
language : en
Publisher:
Release Date : 2010
Electrical Resistivity Tomography In Cylindrical Cells Guidelines For Hardware Pre Design written by J. Y. Lee and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2010 with Electrical resistivity categories.
Electrical resistivity tomography (ERT) allows for fast, non-destructive, and efficient sediment characterization and geotechnical process monitoring in the field as well as in laboratory applications. Besides the spatial distribution of resistivity, specimen geometry and electrode configuration determine the electrical potential distribution and the ensuing spatial resolution in the tomogram. We examine potential and current density distribution in various ERT system configurations using both experimental and numerical methods and explore optimal electrode configurations for cylindrical cells. Results show that optimal ERT configurations must take into consideration the required spatial resolution, sensitivity to anomalies, signal strength, and shunting effects along the cell perimeter. The system characteristics are defined in terms of electrode width Welec and length Lelec, cell diameter Dcell, and the distance from the electrode plane to conductive end-plates ?. The following dimensionless ratios emerge as guidelines for system pre-design: Welec/Dcell??/2n, Lelec /Dcell ?0.4, ?/Dcell>=1, where n is the number of electrodes around the perimeter.
Design Considerations For 3d Electrical Resistivity Tomography Ert Site Investigation Surveys
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Author : J.E. Chambers
language : en
Publisher:
Release Date : 2001
Design Considerations For 3d Electrical Resistivity Tomography Ert Site Investigation Surveys written by J.E. Chambers and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2001 with categories.
Site Investigation Using Resistivity Imaging
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Author : Sahadat Hossain
language : en
Publisher: CRC Press
Release Date : 2018-08-06
Site Investigation Using Resistivity Imaging written by Sahadat Hossain and has been published by CRC Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2018-08-06 with Science categories.
Subsurface investigation is the most important phase of any civil engineering construction or development activities. The geologic conditions can be extremely complex, variable, and subject to change with time; soil test borings and in-situ tests are employed to obtain subsoil information. Resistivity Imaging (RI) is a non-destructive, fast and cost-effective method of site investigation and soil characterization. Site Investigation using Resistivity Imaging aims to summarize pertinent details of RI in site investigation for geotechnical and geo-environmental applications. It aims to bridge the gap that currently exists between the geotechnical/geo-environmental and geophysical engineering community. The geotechnical and geo-environmental engineers will be able to use annd understand geophysical data and utilize the information for their design. Features: First comprehensive handbook aimed at engineers that summarises pertinent details of Resitivity Imaging (RI) in site investigation for geotechnical and geo-environmental applications. for geotechnical and geoenvironmental engineers, making it possible to interpret geophysical data and utilize the information for their design. explanining the advantages of RI over conventional site investigations: continuous image, large coverage, low cost, quick and easy data processing. It will be a comprehensive handbook for the application of RI in geotechnical and geo-environmental site investigations.
Use Of Electrical Resistivity Tomography To Evaluate Processes In Soils
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Author : Victor M. Damasceno
language : en
Publisher:
Release Date : 2007
Use Of Electrical Resistivity Tomography To Evaluate Processes In Soils written by Victor M. Damasceno and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2007 with categories.
An Ultra Precise System For Electrical Resistivity Tomography Measurements
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Author :
language : en
Publisher:
Release Date : 2008
An Ultra Precise System For Electrical Resistivity Tomography Measurements written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2008 with categories.
The objective of this research was to determine the feasibility of building and operating an ERT system that will allow measurement precision that is an order of magnitude better than existing systems on the market today and in particular if this can be done without significantly greater manufacturing or operating costs than existing commercial systems. Under this proposal, we performed an estimation of measurement errors in galvanic resistivity data that arise as a consequence of the type of electrode material used to make the measurements. In our laboratory, measurement errors for both magnitude and induced polarization (IP) were estimated using the reciprocity of data from an array of electrodes as might be used for electrical resistance tomography using 14 different metals as well as one non-metal - carbon. In a second phase of this study, using archival data from two long-term ERT surveys, we examined long-term survivability of electrodes over periods of several years. The survey sites were: the Drift Scale Test at Yucca Mountain, Nevada (which was sponsored by the U.S. Department of Energy as part of the civilian radioactive waste management program), and a water infiltration test at a site adjacent to the New Mexico Institute of Mines and Technology in Socorro, New Mexico (sponsored by the Sandia/Tech vadose program). This enabled us to compare recent values with historical values and determine electrode performance over the long-term as well as the percentage of electrodes that have failed entirely. We have constructed a prototype receiver system, made modifications and revised the receiver design. The revised prototype uses a new 24 bit analog to digital converter from Linear Technologies with amplifier chips from Texas Instruments. The input impedance of the system will be increased from 107 Ohms to approximately 1010 Ohms. The input noise level of the system has been decreased to approximately 10 Nanovolts and system resolution to about 1 Nanovolt at the highest gain range of 125 to 1. The receiver also uses very high precision and high temperature stability components. The goal is to improve the accuracy to better than 0.1%. The system has more receiver channels, eight, to allow efficient data collection at lower base frequencies. We are also implementing a frequency-domain acquisition mode in addition to the time-domain acquisition mode used in the earlier systems. Initial field tests were started in the fall of 2008. We conducted tests on a number of types of cable commonly used for resistivity surveys. A series of different tests were designed to determine if the couplings were primarily resistive, capacitive, or inductive in nature and to ascertain that the response was due to the cable cross-talk and did not depend on the receiver electronics. The results show that the problem appears to be primarily capacitive in nature and does not appear to be due to problems in the receiver electronics. Thus a great deal of emphasis has been placed on finding appropriate cables as well as stable electrodes that have low contact impedance at the very low current flows observed at the receiver. One of the issues in survey design and data collection has been determining how long one must wait before using the same electrode as a transmitter and as a receiver. A series of tests was completed in the laboratory sand tank where four-electrode measurements were made using the same dipole transmitters and dipole receivers (the dipoles used adjacent electrodes). For each data series, a single set of normal measurements were collected with no reciprocals and electrodes were never reused as a receiver after being used as a transmitter. After waiting a specified length of time, the reciprocal measurements were collected using a schedule of measurements. The order of this second schedule was rearranged such that if this second set of measurements were performed without first using the normal schedule, no electrode would be used as a ...
Application Of Electrical Resistivity Tomography Ert To Evaluate The Temperature Impacts On Resistivity Values Of Artificial Groundwater Recharge
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Author : Alicia Chavez
language : en
Publisher:
Release Date : 2022
Application Of Electrical Resistivity Tomography Ert To Evaluate The Temperature Impacts On Resistivity Values Of Artificial Groundwater Recharge written by Alicia Chavez and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2022 with categories.
Electrical Resistivity And Conductivity
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Author : Adel El-Shahat
language : en
Publisher: BoD – Books on Demand
Release Date : 2017-05-31
Electrical Resistivity And Conductivity written by Adel El-Shahat and has been published by BoD – Books on Demand this book supported file pdf, txt, epub, kindle and other format this book has been release on 2017-05-31 with Technology & Engineering categories.
Motivated by the importance of electrical resistivity and conductivity, important experts in this field grasp most recent researches in this book. It addresses recent advances in electrical resistivity and conductivity modelling, measurement, estimation and sensing methods and implications. This book introduces innovative case studies for "Electrical Resistivity Sensing Methods and Implications", "Resistivity Model of Frozen Soil and High-Density Resistivity Method for Exploration of Discontinuous Permafrost", "Measurement of Electrical Resistivity for Unconventional Structures", "Estimation of Hydrological Parameters from Geoelectric Measurements" and "Assessment of Cryoprotectant Concentration by Electrical Conductivity Measurement and Its Applications in Cryopreservation". These recent advances are well prepared and presented in six chapters. These chapters are carefully selected to reflect current variable techniques, new concepts and methods related to the book's topic from different perspectives.
3d Time Lapse Electrical Resistivity Tomography Ert To Monitor Subsurface Flow Processes During Sprinkling And Injection Experiments On A Mountain Slope
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Author : Cornelia Inauen
language : en
Publisher:
Release Date : 2012
3d Time Lapse Electrical Resistivity Tomography Ert To Monitor Subsurface Flow Processes During Sprinkling And Injection Experiments On A Mountain Slope written by Cornelia Inauen and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012 with categories.
Electrical Resistivity Tomography In Environmental Amelioration
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Author : Guye Strobel
language : en
Publisher:
Release Date : 1996
Electrical Resistivity Tomography In Environmental Amelioration written by Guye Strobel and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1996 with categories.