Relevant bibliographies by topics / Electrical resistivity modelling

Academic literature on the topic 'Electrical resistivity modelling'

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Published: 10 December 2022
Last updated: 28 January 2023

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Journal articles on the topic "Electrical resistivity modelling"

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Ahmed Hassan, Asem. "Performance of Various Electrical Resistivity Configurations for Detecting Buried Tunnels Using 2D Electrical Resistivity Tomography Modelling." DJES 11, no. 3 (September 1, 2018): 14–21. http://dx.doi.org/10.24237/djes.2018.11303.

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This work aims to evaluate performance of 2D electrical resistivity modelling technique for detecting buried tunnels using various electrode configurations. A synthetic resistivity model was designed to explore the capability of Wenner, Wenner- Schlumberger, Dipole-Dipole, Pole-Dipole and Pole-Pole electrode configurations for detecting buried tunnels at different noise levels. 2D forward modelling (RES2DMOD) and 2D inversion (RES2DINV) software were implemented using blocky L1 norm optimization method. The results showed that the modelled tunnel can clearly be detected at 0% noise level due to the high resistivity contrast between the synthetic tunnel and the surrounding host materials. At 0-30% noise levels, the results indicated that dipole-dipole and Wenner- Schlumberger in the second order perform better than other configurations. This can be attributed to the characteristics features and sensitivity of these configurations for resolving the subsurface resistivity changes. It is suggested that these configurations are more suitable for detecting the buried structures. The results also showed that the inversion artifacts caused by high noise levels may smear the resistivity signature of the burred targets for particular configurations. Thus, obtaining high quality data ensures reliable resistivity interpretations. The study demonstrated the usefulness of the 2D numerical modelling for planning of electrical resistivity surveys.
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Kasi, Harsha, Robert Meissner, Alexandre Babalian, Harald van Lintel, Arnaud Bertsch, and Philippe Renaud. "Direct localised measurement of electrical resistivity profile in rat and embryonic chick retinas using a microprobe." Journal of Electrical Bioimpedance 1, no. 1 (July 23, 2019): 84–92. http://dx.doi.org/10.5617/jeb.149.

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Abstract We report an alternative technique to perform a direct and local measurement of electrical resistivities in a layered retinal tissue. Information on resistivity changes along the depth in a retina is important for modelling retinal stimulation by retinal prostheses. Existing techniques for resistivity-depth profiling have the drawbacks of a complicated experimental setup, a less localised resistivity probing and/or lower stability for measurements. We employed a flexible microprobe to measure local resistivity with bipolar impedance spectroscopy at various depths in isolated rat and chick embryo retinas for the first time. Small electrode spacing permitted high resolution measurements and the probe flexibility contributed to stable resistivity profiling. The resistivity was directly calculated based on the resistive part of the impedance measured with the Peak Resistance Frequency (PRF) methodology. The resistivity-depth profiles for both rat and chick embryo models are in accordance with previous mammalian and avian studies in literature. We demonstrate that the measured resistivity at each depth has its own PRF signature. Resistivity profiles obtained with our setup provide the basis for the construction of an electric model of the retina. This model can be used to predict variations in parameters related to retinal stimulation and especially in the design and optimisation of efficient retinal implants.
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Putiška, René, Maroš Nikolaj, Ivan Dostál, and David Kušnirák. "Determination of cavities using electrical resistivity tomography." Contributions to Geophysics and Geodesy 42, no. 2 (January 1, 2012): 201–11. http://dx.doi.org/10.2478/v10126-012-0018-3.

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Abstract Geophysical surveys for cavity detection are one of the most common nearsurface applications. The usage of resistivity methods is also very straightforward for the air-filled underground voids, which should have theoretically infinite resistivity in the ERT image. In the first part of the paper, we deal with the comparison of detectability of the cavity by several types of the electrode arrays, the second part discusses the effect of a thin layer around the cavity itself, by means of 2D modelling. The presence of this layer deforms the resistivity image significantly as the resistive anomaly could be turned into a conductive one, in the case when the thin layer is more conductive than the background environment. From the electrical array analysis for the model situation a dipole-dipole and combined pole-dipole shows the best results among the other involved electrical arrays.
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Thapa, Dilli Ram. "Use of two dimensional electrical resistivity tomography (2D- ERT) synthetic modelling to detect collapse masses." Journal of Nepal Geological Society 60 (September 16, 2020): 139–45. http://dx.doi.org/10.3126/jngs.v60i0.31250.

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The presence of collapse masses in the subsurface causes severe problems in the geotechnical design activities. In this study, two dimensional Electrical Resistivity Tomography (2D-ERT) synthetic modelling techniques were used to detect collapse masses commonly found in the river bank. Two dimensional (2D) resistivity models are first created utilizing prior information of collapsed masses in the river bank and afterward inverted to reconstruct the resistivity distribution in the subsurface. The resulting two dimensional models exhibits that collapsed masses can be better detected particularly at low resistivity noise level (2%) than the high noise levels (5% and 10%). The models are particularly very useful prior to executing the field investigations in the river bank sites and furnish the subsurface geology as well as the successful interpretation of the results withconfidence.
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Lavoué, F., J. van der Krak, J. Rings, F. André, D. Moghadas, J. A. Huisman, S. Lambot, L. Weiherrnüller, J. Vanderborght, and H. Vereecken. "Electromagnetic induction calibration using apparent electrical conductivity modelling based on electrical resistivity tomography." Near Surface Geophysics 8, no. 6 (July 1, 2010): 553–61. http://dx.doi.org/10.3997/1873-0604.2010037.

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Ramli, Nadia, Hamzah Hussin, Muhammad Afiq Abdul Kahar, and Mohd Amir Asyraf Sulaiman. "The Utilisation of Electrical Resistivity Imaging (ERI) for Geological Structures Mapping in Rock Mass: A Review." IOP Conference Series: Earth and Environmental Science 1102, no. 1 (November 1, 2022): 012089. http://dx.doi.org/10.1088/1755-1315/1102/1/012089.

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Electrical Resistivity Imaging (ERI) is an in-situ geophysical method widely used in environmental, engineering and hydrogeological explorations due to cost, time, and data coverage efficiency. Traditionally, geotechnical parameters such as discontinuities properties are obtained from rock samples acquired from a borehole. However, it only provides a single information point, costly and time-consuming. Thus, an approach using electrical resistivity to detect the presence of geological structure in a rock mass is an alternative method that can be applied. Discontinuities in rock mass include joints, bedding planes, blasting cracks, fractures, faults, and folds. This paper aims to present the utilisation of geoelectrical resistivity imaging for geological structures mapping in rock mass based on the review from previous research. The Electrical Resistivity Imaging (ERI) method is an effective tool to obtain structural differentiation of geological medium by interpreting 2D and even 3D electrical resistivity models. Electrical Resistivity Imaging (ERI) is an automated data acquisition system, inversion codes, non-invasive and user-friendly. The raw data received from data acquisition was analysed using Res2DINV software. The data inversion was done by applying the robust method and finite element grid to accommodate the steep topography. The data interpretation included numerical modelling to assess the suitability of all used electrode arrays in relation to the geological setting.
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Ahmed Hassan, Asem. "Numerical Modelling of Subsurface Cavities Using 2D Electrical Resistivity Tomography Technique." Diyala Journal For Pure Science 13, no. 2 (April 1, 2017): 197–216. http://dx.doi.org/10.24237/djps.1302.260a.

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Hazreek, Z. A. M., Z. M. Nizam, A. T. S. Azhar, M. Aziman, and M. Z. N. Shaylinda. "Physical Modelling on Detecting Buried Object Using Electrical Resistivity Imaging (ERI)." IOP Conference Series: Materials Science and Engineering 136 (July 2016): 012008. http://dx.doi.org/10.1088/1757-899x/136/1/012008.

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Cardarelli, E., and F. Fischanger. "2D data modelling by electrical resistivity tomography for complex subsurface geology." Geophysical Prospecting 54, no. 2 (March 2006): 121–33. http://dx.doi.org/10.1111/j.1365-2478.2006.00522.x.

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Cadeville, M. C., V. Pierron-Bohnes, J. M. Sanchez, and J. M. Sanchez. "Modelling of the electrical resistivity of ferromagnetic and paramagnetic intermetallic compounds." Journal of Physics: Condensed Matter 4, no. 46 (November 16, 1992): 9053–66. http://dx.doi.org/10.1088/0953-8984/4/46/013.

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Dissertations / Theses on the topic "Electrical resistivity modelling"

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Rücker, Carsten. "Advanced Electrical Resistivity Modelling and Inversion using Unstructured Discretization." Doctoral thesis, Universitätsbibliothek Leipzig, 2011. http://nbn-resolving.de/urn:nbn:de:bsz:15-qucosa-69066.

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In this dissertation an approach is presented for the three-dimensional electrical resistivity tomography (ERT) using unstructured discretizations. The geoelectrical forward problem is solved by the finite element method using tetrahedral meshes with linear and quadratic shape functions. Unstructured meshes are suitable for modelling domains of arbitrary geometry (e.g., complicated topography). Furthermore, the best trade-off between accuracy and numerical effort can be achieved due to the capability of problem-adapted mesh refinement. Unstructured discretizations also allow the consideration of spatial extended finite electrodes. Due to a corresponding extension of the forward operator using the complete electrode model, known from medical impedance tomography, a study about the influence of such electrodes to geoelectrical measurements is given. Based on the forward operator, the so-called triple-grid-technique is developed to solve the geoelectrical inverse problem. Due to unstructured discretization, the ERT can be applied by using a resolution dependent parametrization on arbitrarily shaped two-dimensional and three-dimensional domains. A~Gauss-Newton method is used with inexact line search to fit the data within error bounds. A global regularization scheme is applied using special smoothness constraints. Furthermore, an advanced regularization scheme for the ERT is presented based on unstructured meshes, which is able to include a-priori information into the inversion and significantly improves the resulting ERT images. Structural information such as material interfaces known from other geophysical techniques are incorporated as allowed sharp resistivity contrasts. Model weighting functions can define individually the allowed deviation of the final resistivity model from given start or reference values. As a consequent further development the region concept is presented where the parameter domain is subdivided into lithological or geological regions with individual inversion and regularization parameters. All used techniques and concepts are part of the open source C++ library GIMLi, which has been developed during this thesis as an advanced tool for the method-independent solution of the inverse problem.
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Rouget, Geoffroy. "Modelling the electrical resistivity of green carbon anodes for aluminium industry." Doctoral thesis, Université Laval, 2018. http://hdl.handle.net/20.500.11794/30787.

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L’aluminium primaire produit de nos jours est obtenu par l’électrolyse de l’alumine à 960 °C, suivant le procédé proposé par Charles Martin Hall, et Paul Louis-Toussain Héroult, en 1886. Ce procédé, communément appelé Hall-Héroult, du nom de ceux qui l’ont proposé, consiste à imposer un courant électrique au travers un mélange de cryolithe fondue dans laquelle est dissoute l’alumine. Le courant circule entre les anodes et la cathode de carbone. Les anodes sont principalement composées de coke de pétrole calciné et du reste non consommé des anodes usagées, que l’on appelle mégot. Toutes ces particules carbonées sont liées à l’aide de brai de houille (pitch). Une fois le bloc anodique formé, il doit être cuit afin de lui conférer une bonne tenue mécanique. Pour permettre un rendement efficace lors de ce procédé, les anodes, qui amènent le courant, doivent avoir une résistivité électrique la plus faible possible. De plus, ces anodes, consommables, servent aussi d’apport pour le carbone nécessaire à la réaction d’électrolyse, leur composition chimique doit par conséquent être suffisamment pure pour ne pas affecter la qualité de l’aluminium produit. Le projet de recherche présenté ici se focalise sur l’étude et la compréhension du comportement électrique de l’anode avant sa cuisson à des fins de contrôle de qualité en cours de fabrication. Pour déterminer la résistivité électrique d’un matériau composite, le modèle mathématique de Nielsen semble être un outil très intéressant et polyvalent dans différentes applications de modélisation de la résistivité électrique. Pour utiliser ce modèle, il est nécessaire de connaître certaines propriétés des différentes phases constituant l’anode. Dans le cas présent, le matériau anodique sera limité à une fraction de tailles de particules de coke de pétrole et la matrice liante, composée du pitch et de particules fines de coke de pétrole. Les propriétés à connaître sont, pour les particules de coke, leur résistivité électrique intrinsèque, leur rapport de forme, ainsi que la compacité maximale qui puisse être obtenu avec ce matériau. Seule la résistivité électrique de la matrice liante est à connaître nécessairement. Dans l’industrie de l’aluminium, seule la résistivité électrique d’un lit des particules est mesurée pour suivre l’évolution de ce paramètre suivant les différents lots utilisés. Pour implémenter la résistivité électrique du coke dans le modèle de Nielsen, il est nécessaire de déterminer la résistivité électrique intrinsèque du coke. Afin de déterminer cette valeur, des mesures de résistivité électriques ont été faites en utilisant une méthode quatre pointes, qui permet de mesurer la résistivité électrique des matériaux dont la résistivité est faible. Ensuite, le vide inter particulaire présent dans le volume de mesure est retranché afin de ne compter que le volume occupé par le matériau. Finalement, les contacts entre particules ont été estimés par calcul numérique, en utilisant la méthode des éléments discrets. Le nombre, la surface moyenne et la disposition de ces contacts ont été évalués afin d’être implémentés dans un modèle mathématique permettant de calculer la résistivité électrique du coke. Différentes mesures ont permis de proposer une valeur cohérente et acceptable pour la résistivité électrique du coke. Afin de mesurer la résistivité électrique de la matrice liante ainsi que de l’anode, une méthode précise est requise. La méthode standardisée utilisée par l’industrie montre de grands écarts à la moyenne et des valeurs souvent peu reproductibles. La méthode de mesure de la résistivité électrique proposée par Van der Pauw permet d’obtenir des résultats avec une plus grande reproductibilité et un écart à la moyenne fortement amoindri. Cette méthode peut être utile pour mesurer la résistivité électrique des sections coupées dans une carotte d’anode ou de matrice liante moulée. Différentes mesures, effectuées sur des échantillons type anode de différentes compositions ont révélé que la résistivité électrique mesurée en laboratoire ne correspond pas à celle calculée en utilisant le modèle de Nielsen, intégrant les paramètres physiques des matériaux utilisés. Pour expliquer la divergence entre le modèle et les mesures de laboratoire, une analyse en microscopie optique a été effectuée. Il a été révélé que l’épaisseur de la couche de matrice liante entre les particules demeure trop grande pour permettre la création d’un chemin électrique de particule à particule dans le matériau. Ceci implique que la résistivité électrique de la matrice liante impose principalement la résistivité électrique du composite, dans ce cas.
Primary aluminium produced nowadays is obtained by electrolysis of alumina at 960 °C, following the process proposed by Charles Martin Hall, and Paul Louis Toussain Héroult, in 1886. This process, named Hall-Héroult, due to the name of its creators, consists in applying an electrical current trough a mix of molten cryolithe in which is dissolved alumina. The current flows between the carbon anodes and the cathode. Anodes are mostly composed of calcined petroleum coke aggregates and remnant particles of used anodes, butt particles. Those carbonaceous particles are tied together using coal tar pitch. Once the anode bloc is formed, it is backed to gain mechanical strength. To allow an efficient yield during the electrolysis process, anodes, through which the current flows, shall have the lowest electrical resistivity. Furthermore, those consumable anodes, are also required to bring the carbon as reactant for the electrolytic reaction, consequently, their chemical composition must be pure enough not to diminish the produced aluminium quality. The research project presented focuses on the study and understanding of electrical behaviour of the anode prior to its backing, for quality control during manufacturing process. To determine the electrical resistivity of a composite material, Nielsen’s model appears as an interesting tool, reliable for multiple electrical modelling applications. Using this model implies knowing several properties of the different phases present in the anode. In the present case, anode material is restricted to a specific size fraction of coke particles and binder matrix, made of pitch and fine particles. The properties to know are, for the coke particles, their intrinsic electrical resistivity, aspect ratio, and the maximal packing fraction that can be reached. Only electrical resistivity is required for the binder matrix. In aluminium industry, only the electrical resistivities of beds of particles are measured to follow the evolution of this parameter depending the batch used. To implement the electrical resistivity of coke particles in Nielsen model, its intrinsic electrical resistivity is required. To obtain this value, measurement were performed using four probes setting, which allows measuring the electrical resistivity of material presenting low resistivity. Then, inter-particles void present in the measurement volume shall be removed in order to only take account of the volume occupied by the material investigated. Finally, the contacts between particles are estimated by numerical calculation, using discrete element method. The number, average surface and disposition of the contacts were assessed to implement them in a mathematical model allowing calculating the electrical resistivity of coke. Several measures lead to the proposition of a consistent and reliable value for electrical resistivity of coke. To measure the electrical resistivity of binder matrix, as well as the anode’s, an accurate method is required. The standardised method used in the industry reveals strong standard deviation and rather not often reproducible values. The method of measurement of electrical resistivity of continuous phases proposed by Van der Pauw allows retrieving highly reproducible results, with a much lower standard deviation. This technique can be useful to measure the electrical resistivity of slices cut out of anode cores or cast binder matrix. Several measurements, performed on anode like samples with different composition revealed that the electrical resistivity measured in laboratory does not fit with the one calculated using Nielsen’s model, using the physical parameters of the characterized materials. To explain the difference, between the model and laboratory measurements, an optical microscopic analysis was performed. It was disclosed that the binder matrix layer between particles remain too thick to allow the creation of an electrical path from particle to particle within the material. This implies that the electrical resistivity of the binder matrix mostly dictates the one of the composite material, in this case.
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Rücker, Carsten [Verfasser], Franz [Akademischer Betreuer] Jacobs, and Ugur [Akademischer Betreuer] Yaramanci. "Advanced Electrical Resistivity Modelling and Inversion using Unstructured Discretization / Carsten Rücker. Gutachter: Ugur Yaramanci. Betreuer: Franz Jacobs." Leipzig : Universitätsbibliothek Leipzig, 2011. http://d-nb.info/1020089210/34.

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Carlos, Ivan Mamede. "Estimativa de parâmetros hidrogeológicos como subsídio para modelagem de aqüífero integrada a estudos geofísicos na região de Bebedouro-SP." Universidade de São Paulo, 2010. http://www.teses.usp.br/teses/disponiveis/14/14132/tde-21072013-161330/.

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Realizar a modelagem de um aqüífero não é tarefa fácil. Em se tratando de um sistema aqüífero, a empreitada se torna ainda mais complexa. Neste trabalho, alguns dos parâmetros importantes para esse fim foram estimados a partir de simulações. Na região de estudo, existem poços tubulares que, em sua maioria, não foram perfurados somente na Formação Adamantina, mas também na Formação Serra Geral. Tal configuração conduziu à formulação de dois conjuntos de cenários a partir dos quais foi possível estimar valores de condutividade hidráulica para as duas formações. Com essa estimativa conseguiu-se também simular testes de bombeamento, seus respectivos cones de rebaixamento, bem como a interferência causada entre cones de rebaixamento. Com essa abordagem foi possível estimar o quanto um poço em funcionamento pode influenciar no nível estático de um vizinho. A contribuição da geofísica está no uso da eletroresistividade. Foram executadas 23 Sondagens Elétricas Verticais (SEV), das quais dezenove são SEV´s curtas (AB/2 500m) e quatro, longas (AB/2 1500), que forneceram informações sobre a espessura saturada do arenito e posição do topo do basalto, especialmente na região com poucos poços. Também foram realizados quatro Caminhamentos Elétricos (CE) no estudo de possíveis estruturas. Unindo os resultados da modelagem (simulação) e da geofísica, pôde-se relacionar os parâmetros hidrogeológicos e geoelétricos. Embora o conjunto de dados para a região não tenha sido o ideal, a metodologia se mostrou adequada e os resultados bastante razoáveis. Deste modo, foi possível a determinação de parâmetros hidrogeológicos em subsuperfície através de parâmetros geoelétricos medidos em superfície.
To perform the aquifer modelling is not an easy task. In the case of an aquifer system, the work becomes even more complex. In this work, some of important parameters for this purpose have been estimated from simulations. In the study area, there are wells that in most cases were not only drilled in Adamantina Formation but also in Serra Geral Formation. This configuration led to the formulation of two sets of scenarios from which it was possible to estimate values for hydraulic conductivity of these formations. With this estimate it could also simulate pumping tests, their cones of depression as well as the interference caused between cones of depression. With this approach it was possible to estimate how much a operating well can influence static level of a neighbour one. Geophysics contribution is in the use of electrical resistivity. Twenty-three Vertical Electrical Soundings (VES) were performed, nineteen of them are short (AB/2 500m), that provided information about the saturated thickness of sandstone as well as top of basalt, especially in the region with few wells, and four are long (AB/2 1500) VESs. Four electrical profiling (EP) were also carried out to study possible structures. Joining modelling (simulation) and geophysics results, it could be related hydrogeological and geoelectrical parameters. Although dataset for region was not the ideal, methodology was satisfactory, and results quite reasonable. Thus, it was possible to determine hydrogeological parameters in subsurface through measured geoelectrical parameters in surface.
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Abdou, Ibro Mohamed. "Vers la prédiction des cinétiques de rééquilibrage entre 2 milieux initialement en conditions de saturation différentes." Thesis, Toulouse 3, 2020. http://www.theses.fr/2020TOU30069.

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Les ouvrages du génie civil sont constamment soumis à des processus de désaturation/re-saturation en fonction des conditions environnantes. C'est notamment le cas des ouvrages en béton pour le stockage de déchets radioactifs en couche profonde. La connaissance des phénomènes de transfert hydrique qui ont lieu au cours de ces phases de rééquilibrage hydrique est d'une importance fondamentale pour évaluer la durabilité de ces ouvrages. Ce travail de thèse présente une étude à la fois expérimentale et de simulation numérique sur les principaux mécanismes qui entrent en jeu au cours du rééquilibrage au sein des matériaux cimentaires. Dans un premier temps, les expériences réalisées permettent de caractériser le comportement hydrique des matériaux à travers l'acquisition des principaux paramètres de transfert (porosité, isothermes de sorption, perméabilité au liquide à la vapeur et au gaz). Cela permettra de discuter de la pertinence des différentes approches numériques et/ou empirique pour leur prédiction dans le cas des matériaux cimentaires. Dans un second temps, l'étude se focalise sur les phénomènes entrant en jeu dans un processus de rééquilibrage hydrique entre deux échantillons, à travers diverses expériences de transfert hydrique (séchage, imbibition de vapeur et d'eau liquide). Une méthodologie basée sur l'évaluation non destructive des matériaux est mise au point pour la détermination des profils de teneur en eau. Une approche adéquate est proposée pour la modélisation des mécanismes de transfert d'humidité dans les matériaux cimentaires, basée sur un modèle de réseau poreux pour la prédiction des paramètres de transfert développé par Ranaivomanana et al. (Ranaivomanana et al., 2011, 2013) Une meilleure prédiction de ces phénomènes pris individuellement permettra d'obtenir les informations nécessaires pour la modélisation du processus global
Civil engineering structures are constantly subjected to desaturation/re-saturation processes depending on the surrounding conditions. This is particularly the case when it comes to concrete structures for the deep geological storage of radioactive waste. It is fundamental to understand the water transfer phenomena that occur during these water rebalancing phases to assess the sustainability of these structures. This thesis presents both an experimental and a numerical simulation study on the main mechanisms that are involved during the rebalancing process within cement-based materials. First, the experiments carried out make it possible to characterize the hydric behaviour of the materials through the acquisition of the main transfer parameters (porosity, sorption isotherms, permeability to liquid, vapour and gas). This will allow discussion of the relevance of different numerical and/or empirical approaches to their prediction in the case of cement-based materials. Then, the study focuses on the phenomena involved in a water rebalancing process between two samples, through various water transfer experiments (drying, soaking of steam and liquid water). A methodology based on non-destructive evaluation of materials is developed for the determination of moisture content profiles. A suitable approach is proposed for the modelling of moisture transfer mechanisms in cement-based materials, based on a porous network model for the prediction of transfer parameters developed by Ranaivomanana et al. A better prediction of these phenomena taken individually will provide the required information for the modelling of the global process
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Fachin, Sérgio Junior da Silva. "Ensaios geoelétricos 2D no antigo lixão de Ribeirão Preto-SP: avaliação de parâmetros de aquisição e monitoramento ambiental do problema." Universidade de São Paulo, 2007. http://www.teses.usp.br/teses/disponiveis/14/14132/tde-09112007-152210/.

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Em razão da crescente preocupação com a proteção ao meio ambiente e preservação da qualidade das águas superficiais e subterrâneas, as áreas de disposição de resíduos, tanto domésticos como industriais, têm merecido especial atenção das instituições de pesquisa ligadas à proteção ambiental. Atualmente o uso dos métodos geoelétricos vem se destacando como metodologia indireta de investigação de áreas afetadas pela disposição inadequada de resíduos sólidos urbanos e industriais pois fornecem, desde que adequadamente escolhidas as técnicas e os parâmetros de aquisição, informações importantes com respeito à localização e geometria dos depósitos de resíduos, extensão da pluma de contaminação, posição da zona saturada e sentido do fluxo subterrâneo, características litológicas e presença de estruturas geológicas. A integração de ferramentas como simulações e métodos de interpretação qualitativa e quantitativa também auxiliam na caracterização e monitoramento ambiental de áreas de disposição de resíduos sólidos. O objetivo principal deste trabalho foi a avaliação de alguns parâmetros de aquisição 2D (arranjos eletródicos, espaçamento entre eletrodos e níveis de investigação) com os métodos da Eletrorresistividade e da Polarização Induzida, para caracterização e monitoramento ambiental. Esta avaliação foi realizada através do uso de modelagens diretas bidimensionais e ensaios de campo, tendo como área de estudos o antigo lixão do município de Ribeirão Preto-SP. O uso das modelagens diretas permitiu escolher os melhores parâmetros de aquisição de acordo com as respostas obtidas pelo modelo geológico-geofísico simulado. Os parâmetros de aquisição testados em campo refletiram os resultados obtidos através das modelagens diretas. O arranjo Polo-dipolo (a= 5 metros e n= 10) apresentou os melhores resultados (melhor resolução lateral e maior profundidade de investigação). Os resultados obtidos com as investigações de campo comparados com resultados anteriores (1997), mostraram que ainda há contaminação, marcada por baixos valores de resistividade elétrica (1 à 30 Ohm.m) e altos valores de cargabilidade (15 à 50 mV/V).
Due to the increasing concern with the environmental protection and preservation of the shallow water and groundwater aquifers quality, the areas of disposal of residues, have been special attention of the environmental protection agency. Currently the geoelectrical methods have been largely used as an investigation non-evasive methodology in affected areas by inadequate disposal of urban solid and industrial residues, because it provides information of the localization and geometrical characteristics of the waste disposal, contamination plume extent, saturated zone position, underground flow direction and geologic characteristic, if the techniques and the acquisition parameters are adequately chosen. The simulations and interpretation methods also assists during the characterization and environmental monitoring of landfill areas. The objective of this research was the evaluation of the acquisition field parameters (electrodes arrays, electrodes spacing and number of the investigations levels) and 2D investigations with the resistivity and induced polarization methods for characterization and environmental monitoring. This evaluation was carried through the use of 2D forward modeling and field investigations in old landfill site at Ribeirão Preto city, São Paulo, Brazil. The use of the forward modeling allowed to choose the best field acquisition parameters in accordance with the answers for the geologic-geophysical simulated model. The comparison between our results and previous results showed contamination marked for low electric resistivity values (1 ? 30 Ohm.m) and high chargeability values (15 ? 50 mV/V) and also that the tested parameters of acquisition in agreement with the results of the forward modeling. The Pole-dipole array (a= 5 meters and n= 10) show the best result (resolution image and investigation depth), forward modelling and field acquisition.
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Rücker, Carsten. "Advanced Electrical Resistivity Modelling and Inversion using Unstructured Discretization." Doctoral thesis, 2010. https://ul.qucosa.de/id/qucosa%3A11189.

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In this dissertation an approach is presented for the three-dimensional electrical resistivity tomography (ERT) using unstructured discretizations. The geoelectrical forward problem is solved by the finite element method using tetrahedral meshes with linear and quadratic shape functions. Unstructured meshes are suitable for modelling domains of arbitrary geometry (e.g., complicated topography). Furthermore, the best trade-off between accuracy and numerical effort can be achieved due to the capability of problem-adapted mesh refinement. Unstructured discretizations also allow the consideration of spatial extended finite electrodes. Due to a corresponding extension of the forward operator using the complete electrode model, known from medical impedance tomography, a study about the influence of such electrodes to geoelectrical measurements is given. Based on the forward operator, the so-called triple-grid-technique is developed to solve the geoelectrical inverse problem. Due to unstructured discretization, the ERT can be applied by using a resolution dependent parametrization on arbitrarily shaped two-dimensional and three-dimensional domains. A~Gauss-Newton method is used with inexact line search to fit the data within error bounds. A global regularization scheme is applied using special smoothness constraints. Furthermore, an advanced regularization scheme for the ERT is presented based on unstructured meshes, which is able to include a-priori information into the inversion and significantly improves the resulting ERT images. Structural information such as material interfaces known from other geophysical techniques are incorporated as allowed sharp resistivity contrasts. Model weighting functions can define individually the allowed deviation of the final resistivity model from given start or reference values. As a consequent further development the region concept is presented where the parameter domain is subdivided into lithological or geological regions with individual inversion and regularization parameters. All used techniques and concepts are part of the open source C++ library GIMLi, which has been developed during this thesis as an advanced tool for the method-independent solution of the inverse problem.
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Ellis, M. H., T. A. Minshull, M. C. Sinha, and Angus I. Best. "JOINT SEISMIC/ELECTRICAL EFFECTIVE MEDIUM MODELLING OF HYDRATE-BEARING MARINE SEDIMENTS AND AN APPLICATION TO THE VANCOUVER ISLAND MARGIN." 2008. http://hdl.handle.net/2429/1158.

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Remote determination of the hydrate content of marine sediments remains a challenging problem. In the absence of boreholes, the most commonly used approach involves the measurement of Pwave velocities from seismic experiments. A range of seismic effective medium methods has been developed to interpret these velocities in terms of hydrate content, but uncertainties about the pore-scale distribution of hydrate can lead to large uncertainties in this interpretation. Where borehole geophysical measurements are available, electrical resistivity is widely used as a proxy for hydrate content, and the measurement of resistivity using controlled source electromagnetic methods shows considerable promise. However, resistivity is commonly related to hydrate content using Archie’s law, an empirical relationship with no physical basis that has been shown to fail for hydrate-bearing sediments. We have developed an electrical effective medium method appropriate to hydrate-bearing sediments based on the application of a geometric correction to the Hashin-Shrikman conductive bound, and tested this method by making resistivity measurements on artificial sediments of known porosity. We have adapted our method to deal with anisotropic grains such as clay particles, and combined it with a well-established seismic effective medium method to develop a strategy for estimating the hydrate content of marine sediments based on a combination of seismic and electrical methods. We have applied our approach to borehole geophysical data from Integrated Ocean Drilling Program Expedition 311 on the Vancouver Island margin. Hydrate saturations were determined from resistivity logs by adjusting the geometric factor in areas of the log where hydrate was not present. This value was then used over the entire resistivity log. Hydrate saturations determined using this method match well those determined from direct measurements of the methane content of pressurized cores.
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Gill, R. M. "A magnetotelluric profile across the Broken Hill and Olary Domains." Thesis, 2002. http://hdl.handle.net/2440/113040.

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This item is only available electronically.
Seventeen magnetotelluric survey sites were occupied across the Olary and Broken Hill Domains in the Curnamona Province, Australia. Two dimensional modelling along the magnetotelluric profile identifies the Broken Hill Domain as a zone of high electrical resistivity to a depth of 15km. Gravity modelling along a coincident profile has also shown the Broken Hill Domain to be significantly more dense than its surrounds. Seismic data have provided evidence of numerous faults and shear zones within the Pre-cambrian Broken Hill Domain basement, and is indicative of compression during the Delamarian Orogeny. It is proposed that the majority of crustal fluids were removed from these rocks by granulite facies metamorphism and tectonic compression. The boundary of the Olary Domain appears to be delineated by the Mundi Mundi Fault with an order of magnitude increase in resistivity on the Broken Hill side. The location of the Flinders Conductivity Anomaly was also observed and a number of conducting mechanisms considered, including crustal fluids and graphite films.
Thesis (B.Sc.(Hons)) -- University of Adelaide, School of Physical Sciences, 2002
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Books on the topic "Electrical resistivity modelling"

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Delgado Martín, Jordi, Andrea Muñoz-Ibáñez, and Ismael Himar Falcón-Suárez. 6th International Workshop on Rock Physics: A Coruña, Spain 13 -17 June 2022: Book of Abstracts. 2022nd ed. Servizo de Publicacións da UDC, 2022. http://dx.doi.org/10.17979/spudc.000005.

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[Abstract] The 6th International Workshop on Rock Physics (6IWRP) was held A Coruña, Spain, between 13th and 17th of June, 2022. This meeting follows the track of the five successful encounters held in Golden (USA, 2011), Southampton (UK, 2013), Perth (Australia, 2015), Trondheim (Norway, 2017) and Hong Kong (China, 2019). The aim of the workshop was to bring together experiences allowing to illustrate, discuss and exchange recent advances in the wide realm of rock physics, including theoretical developments, in situ and laboratory scale experiments as well as digital analysis. While rock physics is at the core of the oil & gas industry applications, it is also essential to enable the energy transition challenge (e.g. CO2 and H2 storage, geothermal), ensure a safe and adequate use of natural resources and develop efficient waste management strategies. The topics of 6IWRP covered a broad spectrum of rock physics-related research activities, including: • Experimental rock physics. New techniques, approaches and applications; Characterization of the static and dynamic properties of rocks and fluids; Multiphysics measurements (NMR, electrical resistivity…); Deep/crustal scale rock physics. • Modelling and multiscale applications: from the lab to the field. Numerical analysis and model development; Data science applications; Upscaling; Microseismicity and earthquakes; Subsurface stresses and tectonic deformations. • Coupled phenomena and rock properties: exploring interactions. Anisotropy; Flow and fractures; Temperature effects; Rock-fluid interaction; Fluid and pressure effects on geophysical signatures. • The energy transition challenge. Applications to energy storage (hydrogen storage in porous media), geothermal resources, energy production (gas hydrates), geological utilization and storage of CO2, nuclear waste disposal. • Rock physics templates: advances and applications. Quantitative assessment; Applications to reser voir characterization (role of seismic wave anisotropy and fracture networks). • Advanced rock physics tools. Machine learning; application of imaging (X-ray CT, X-ray μCT, FIB-SEM…) to obtain rock proper ties. This book compiles more than 50 abstracts, summarizing the works presented in the 6IWRP by rock physicists from all over the world, belonging to both academia and industry. This book means an updated overview of the rock physics research worldwide.
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Book chapters on the topic "Electrical resistivity modelling"

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Bharathi, A., Y. Hariharan, Awadhesh Mani, and C. S. Sundar. "Electrical Resistivity and Positron Lifetime Studies in the Kondo Insulating System, FeSi1−xGex." In Frontiers in Materials Modelling and Design, 170–76. Berlin, Heidelberg: Springer Berlin Heidelberg, 1998. http://dx.doi.org/10.1007/978-3-642-80478-6_16.

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Vooijs, Simone, Bruce Davenport, and Sybrand van der Zwaag. "Monitoring Precipitation Kinetics in an Al-Mn-Mg-Cu Alloy using Thermoelectric Power and Electrical Resistivity Measurements." In Microstructures, Mechanical Properties and Processes - Computer Simulation and Modelling, 90–95. Weinheim, FRG: Wiley-VCH Verlag GmbH & Co. KGaA, 2005. http://dx.doi.org/10.1002/3527606157.ch15.

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Quagliarini, Andrea, Andrea Segalini, Alessandro Chelli, Roberto Francese, Massimo Giorgi, and Laura Spaggiari. "Joint Modelling and Monitoring on Case Pennetta and Case Costa Active Landslides System Using Electrical Resistivity Tomography and Geotechnical Data." In Advancing Culture of Living with Landslides, 593–600. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-53485-5_68.

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Pluckhahn, Thomas J., and Victor D. Thompson. "Context." In New Histories of Village Life at Crystal River, 25–70. University Press of Florida, 2018. http://dx.doi.org/10.5744/florida/9781683400356.003.0002.

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The importance of the archaeological site of Crystal River has been known since at least 1859, but it was excavations in the site’s burial mounds by C.B. Moore in the early twentieth that made the site famous among archaeologists. Later, Ripley Bullen provided additional insight on several of the other mounds and the village at Crystal River, and he and Adelaide Bullen supplied the first account of the nearby site of Roberts Island. Unfortunately, however, the excavations of both Moore and Bullen are underreported, and there has been little work at the sites using modern archaeological methods. Recent work under the auspices of the Crystal River Early Village Archaeological Project rectifies this with research program that combines the analysis of previous collections with minimally invasive new field work. The latter included detailed topographic mapping, coring and shovel testing, geophysical resistivity survey using ground-penetrating radar and electrical resistance, Bayesian modelling, and small-scale test excavations. As a result of these investigations, the sites are among the most thoroughly dated of any Woodland-period sites in eastern North America.
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Conference papers on the topic "Electrical resistivity modelling"

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Moore, J., R. Barker, and A. Herbert. "Combined electrical resistivity and pumping test modelling." In 4th EEGS Meeting. European Association of Geoscientists & Engineers, 1998. http://dx.doi.org/10.3997/2214-4609.201407072.

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Najafabadipour, A., and G. Kamali. "Exploring and Modelling the Qanat Gallery Path Using Electrical Resistivity Tomography Data." In 1st Conference on Geophysics for Infrastructure Planning Monitoring and BIM. European Association of Geoscientists & Engineers, 2019. http://dx.doi.org/10.3997/2214-4609.201902532.

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Fortier, R., W. Yu, and M. El Baroudi. "Electrical Resistivity and Temperature Piezocone Penetration Test in Ice-Rich Permafrost in Nunavik, Québec, Canada: Signal Processing and Forward Modelling of Electrical Resistivity Signal." In 18th International Conference on Cold Regions Engineering and 8th Canadian Permafrost Conference. Reston, VA: American Society of Civil Engineers, 2019. http://dx.doi.org/10.1061/9780784482599.005.

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Antoine, Raphael, Ioana Ciotir, Stephane Costa, Yannick Fargier, Cyrille Fauchard, Christian Gout, Carole le Guyader, Olivier Maquaire, Sam Taoum, and Antoine Tonnoir. "Coastline Erosion Study via UAV Drone Remote Sensing Using Python Modelling Electrical Resistivity Imaging (PyMERI)." In IGARSS 2020 - 2020 IEEE International Geoscience and Remote Sensing Symposium. IEEE, 2020. http://dx.doi.org/10.1109/igarss39084.2020.9323414.

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Adeoti, Lukumon, Seun Afolabi, Kehinde Ishola, and Bolaji Adegbola. "Comparison of resolution capacity of different electrode arrays in delineating fractured zones using electrical resistivity modelling." In International Conference and Exhibition, Barcelona, Spain, 3-6 April 2016. Society of Exploration Geophysicists and American Association of Petroleum Geologists, 2016. http://dx.doi.org/10.1190/ice2016-6531633.1.

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Yan, Bo, Yuguo Li, and Ying Liu. "Adaptive finite element modelling of direct current resistivity in 2-D generally anisotropic structures." In International Workshop and Gravity, Electrical & Magnetic Methods and their Applications, Chenghu, China, 19-22 April 2015. Society of Exploration Geophysicists and and Chinese Geophysical Society, 2015. http://dx.doi.org/10.1190/gem2015-036.

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Maxwell, Michael, Robert Eso, and Doug Oldenburg. "USING 2D AND 3D ELECTRICAL RESISTIVITY AND MAGNETOMETRIC RESISTIVITY TECHNIQUES FOR INVESTIGATING DAM AND DIKE SOIL CONDITIONS FOR LEAK DETECTION — FIELD EXAMPLES AND FORWARD MODELLING." In Symposium on the Application of Geophysics to Engineering and Environmental Problems 2013. Environment and Engineering Geophysical Society, 2013. http://dx.doi.org/10.4133/sageep2013-264.1.

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Ma*, Changying, Jianxin Liu, Wenwu Tang, Haifei Liu, Rongwen Guo, Yian Cui, and Zhenwei Guo. "An element-free Galerkin method based on hybrid background cells for 2.5D DC resistivity modelling." In GEM 2019 Xi'an: International Workshop and Gravity, Electrical & Magnetic Methods and their Applications, Chenghu, China, 19-22 April 2015. Society of Exploration Geophysicists and Chinese Geophysical Society, 2019. http://dx.doi.org/10.1190/gem2019-067.1.

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Simakov, A., S. Vakulenko, A. Politcina, P. Ivanov, E. Rusakov, M. Marchenko, and N. Shustov. "Efficiency Evaluation of High-Resolution Seismic; Electrical Resistivity Tomography and Electromagnetic Surveys on Rivers, Based on Modelling Studies." In Engineering and Mining Geophysics 2020. European Association of Geoscientists & Engineers, 2020. http://dx.doi.org/10.3997/2214-4609.202051178.

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Cardarelli, E., and F. Fischanger. "2-D data modelling by electrical resistivity tomography for complex subsurface geology (is it possible to improve electronic interpretation of resistivity measurements with multielectrode devices in undeterminated cases?)." In 9th EAGE/EEGS Meeting. European Association of Geoscientists & Engineers, 2003. http://dx.doi.org/10.3997/2214-4609.201414471.

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Reports on the topic "Electrical resistivity modelling"

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Ansari, S. M., E. M. Schetselaar, and J. A. Craven. Three-dimensional magnetotelluric modelling of the Lalor volcanogenic massive-sulfide deposit, Manitoba. Natural Resources Canada/CMSS/Information Management, 2022. http://dx.doi.org/10.4095/328003.

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Unconstrained magnetotelluric inversion commonly produces insufficient inherent resolution to image ore-system fluid pathways that were structurally thinned during post-emplacement tectonic activity. To improve the resolution in these complex environments, we synthesized the 3-D magnetotelluric (MT) response for geologically realistic models using a finite-element-based forward-modelling tool with unstructured meshes and applied it to the Lalor volcanogenic massive-sulfide deposit in the Snow Lake mining camp, Manitoba. This new tool is based on mapping interpolated or simulated resistivity values from wireline logs onto unstructured tetrahedral meshes to reflect, with the help of 3-D models obtained from lithostratigraphic and lithofacies drillhole logs, the complexity of the host-rock geological structure. The resulting stochastic model provides a more realistic representation of the heterogeneous spatial distribution of the electric resistivity values around the massive, stringer, and disseminated sulfide ore zones. Both models were combined into one seamless tetrahedral mesh of the resistivity field. To capture the complex resistivity distribution in the geophysical forward model, a finite-element code was developed. Comparative analyses of the forward models with MT data acquired at the Earth's surface show a reasonable agreement that explains the regional variations associated with the host rock geological structure and detects the local anomalies associated with the MT response of the ore zones.
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