Application Research on Equivalent Apparent Resistivity Method in Building Electrical Column Structure

2013 ◽  
Author(s):  
Gengen Qiu ◽  
Xiaobo Zhang ◽  
Hui Fang ◽  
Qing Zhong ◽  
Fagen Pei ◽  
...  
Keyword(s):  
Apparent Resistivity ◽  
Application Research ◽  
Resistivity Method ◽  
Column Structure

A TRI‐POTENTIAL METHOD OF RESISTIVITY PROSPECTING

Geophysics ◽  
1956 ◽  
Vol 21 (2) ◽  
pp. 455-469 ◽  
Author(s):  
E. W. Carpenter ◽  
G. M. Habberjam
Keyword(s):  
Apparent Resistivity ◽  
Potential Method ◽  
Electrode Configuration ◽  
Practical Application ◽  
Resistivity Method

This paper describes a method whereby three resistances are measured for a four electrode configuration, and relations between these three resistances and their corresponding apparent resistivities are derived. The practical application of the resistance relation as a means of detecting observational and instrumental errors is indicated. The concept of apparent resistivity is examined and by means of examples it is shown that the apparent resistivity can take negative values. Finally, the possibility of using the triple resistivity method as a means of distinguishing between the effects of lateral and vertical resistivity changes on depth probes is discussed.

scholarly journals Breaks in Resistivity Sounding Curves as Indicators of Hard Rock Aquifers

1983 ◽  
Vol 14 (1) ◽  
pp. 33-40 ◽  
Author(s):  
P. N. Ballukraya ◽  
R. Sakthivadivel ◽  
R. Baratan
Keyword(s):  
Empirical Study ◽  
Deep Water ◽  
Apparent Resistivity ◽  
Hard Rock ◽  
Fracture Zones ◽  
Resistivity Sounding ◽  
Resistivity Method ◽  
Hard Rock Aquifers

In a previous paper (Nordic Hydrology, Vol. 12, 1981), the authors have discussed the inadequacies in the technique of resistivity method for location of sites for constructing deep water walls in hard rock areas. It was pointed out that the water bearing fracture zones in the bed rock could not be identified by merely considering geoelectrical parameters such as layer resistivity. An empirical study based on the correlation of minor irregularities or deviations – “BREAKS” – in the normally smooth sounding curves with the actual driller's logs reveals that under normal geo-electric conditions these water bearing zones (hard rock aquifers) are indicated in the curve by a perceptible lowering of apparent resistivity and hence could be used as a guide for locating well sites. As such breaks may also be caused by other conditions such as lateral inhomogeneities, certain methods for distinguishing them are discussed.

Comparison between Different Apparent Resistivity Definitions of CSAMT

2019 ◽  
Vol 24 (1) ◽  
pp. 119-127 ◽  
Author(s):  
Dongyang Hou ◽  
Guoqiang Xue ◽  
Nannan Zhou ◽  
Yiming He ◽  
Wen Chen
Keyword(s):  
Magnetic Field ◽  
Apparent Resistivity ◽  
Field Component ◽  
Single Component ◽  
Alternative Methods ◽  
Theoretical Formula ◽  
Controlled Source ◽  
Resistivity Method ◽  
Calculation Results

Controlled source audio-frequency magnetotelluric (CSAMT) is typically used to obtain data regarding Cagniard resistivity by calculating the ratio between the electric field and magnetic field. However, noise conditions tend to provide different influences on the electrical and magnetic field component data. Therefore, it has become necessary to develop alternative methods to define apparent resistivity using suitable component data. In addition to the traditional Cagniard resistivity, the conventional single-component and modified single-component apparent resistivity methods have been proposed. In this research we discuss those three different apparent resistivity definitions from the aspects of theoretical formula, applicability, and calculation results of a synthetic model. We find that the modified single-component apparent resistivity method can be successfully used to achieve higher data quality nearer the source, thereby improving the exploration precision. Finally, a case study is conducted to verify our results, which show that the modified apparent resistivity method has the ability to effectively reflect the geoelectric profiling information.

scholarly journals A Resistivity Survey of Phosphate Nodules in Oshoshun, Southwestern Nigeria

2018 ◽  
Vol 65 (2) ◽  
pp. 103-114 ◽  
Author(s):  
Oluseun Adetola Sanuade ◽  
Abayomi Adesola Olaojo ◽  
Adesoji Olumayowa Akanji ◽  
Michael Adeyinka Oladunjoye ◽  
Gabriel E. Omolaiye
Keyword(s):  
Electrical Resistivity ◽  
Apparent Resistivity ◽  
Inversion Algorithm ◽  
Clayey Sand ◽  
Southwestern Nigeria ◽  
Resistivity Data ◽  
Resistivity Method ◽  
Dahomey Basin ◽  
Geophysical Study ◽  
Electrical Resistivity Method

Abstract This geophysical study was carried out to determine the occurrence of phosphate nodules in the Oshoshun Formation of the Dahomey Basin, Southwestern Nigeria. The electrical resistivity method, comprising 1D vertical electrical sounding (VES; using Schlumberger array) and 2D geoelectrical imaging (using Wenner array), was used to determine the nature and depth of occurrence of the phosphate nodules. Six profile lines were established within the study area, and inverted sections were generated from the apparent resistivity data using DIPRO inversion algorithm. Five VES points were also acquired in the study area, and Win- Resist programme was used to process and interpret the field resistivity data. Four pits were dug along the profiles to verify the interpreted results. The results obtained by both techniques reveal similar geoelectric units: the top soil, clay, clayey sand and clay at different depths. These layers host pockets of phosphate nodules (78-≥651 Ωm) with varying thicknesses. The strong correlation between the lithology profiles obtained from the pits and the interpreted results of the inverted apparent resistivity sections demonstrates the efficacy of the electrical resistivity method in characterising phosphate occurrence within the formation.

MAPPING GILSONITE VEINS WITH THE ELECTRICAL RESISTIVITY METHOD

Geophysics ◽  
1967 ◽  
Vol 32 (2) ◽  
pp. 302-310 ◽  
Author(s):  
Walter W. Hays ◽  
Otto W. Nuttli ◽  
Leroy Scharon
Keyword(s):  
Electrical Resistivity ◽  
Theoretical Model ◽  
Apparent Resistivity ◽  
Electrical Current ◽  
Electrode Configuration ◽  
Electrode Spacing ◽  
Uinta Basin ◽  
Resistivity Method ◽  
Electrical Resistivity Method

Gish‐Rooney type electrical resistivity equipment was employed to map the location and structural attitude of gilsonite veins in the Uinta Basin, southeast of Vernal, Utah. Horizontal profiles at right angles to the strike of the dike‐like gilsonite veins were made using the Wenner electrode configuration. Very sharp anomalies with a peak apparent resistivity value of the order of 20,000–25,000 ohm‐cm were observed. The peak values were measured over the center of the vein, but smaller auxiliary highs were also observed, symmetrically spaced on each side of the vein. The position of the auxiliary high varied as a function of the electrode spacing and was found to occur when the current stake was located in the gilsonite. The observed field profiles were compared with various theoretical profiles computed from theoretical apparent resistivity expressions derived through the use of images. The best correlation was obtained when the theoretical model was assumed to have an infinite resistivity relative to that of the surrounding material. This correlation supports the conclusion that the gilsonite veins, because of their extremely large resistivity and their vertical attitude, act as a vertical insulating sheet to the flow of electrical current in the ground.

scholarly journals Quantitative Detection of Clogging in Horizontal Subsurface Flow Constructed Wetland Using the Resistivity Method

Water ◽  
2018 ◽  
Vol 10 (10) ◽  
pp. 1334
Author(s):  
Huaqing Liu ◽  
Zhen Hu ◽  
Shiying Song ◽  
Jian Zhang ◽  
Lichao Nie ◽  
...  
Keyword(s):  
Constructed Wetland ◽  
Apparent Resistivity ◽  
Subsurface Flow ◽  
Quantitative Detection ◽  
Laboratory Procedure ◽  
Resistivity Method ◽  
Sediment Fraction ◽  
Subsurface Flow Constructed Wetland ◽  
Horizontal Subsurface Flow

Substrate clogging seriously affects the lifetime and treatment performance of subsurface flow constructed wetlands (SSF CWs), and the quantitative detection of clogging is the key challenge in the management of substrate clogging. This paper explores the feasibility of the resistivity method to detect the clogging degree of an SSF CW. The clogged substrate was found to have a high water-holding capacity, which led to low apparent resistivity in the draining phase. On the basis of the resistivity characteristics, clogging quantification was performed with a standard laboratory procedure, i.e., the Wenner method used in a Miller Soil Box. The apparent resistivity to sediment fraction (v/v) (ARSF) model was established to evaluate the degree of clogging from the apparent resistivity. The results showed that the ARSF model fit well with the actual values (linear slope = 0.986; R-squared = 0.98). The methods for in situ resistivity detection were applied in a lab-scale horizontal subsurface flow constructed wetland (HSSF CW). Combined with the ARSF model, the two-probe method demonstrated high accuracy for clogging quantification (relative error less than 9%). These results suggest that the resistivity method is a reliable and feasible technique for in situ detection of clogging in SSF CWs.

scholarly journals Determination of the Spread of Heavy Metal from Ori-Ile Battery Waste Dumpsite Using Electrical Resistivity Method

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Mutiu A. Fakunle ◽  
James A. Adegoke ◽  
Joseph O. Enemali
Keyword(s):  
Heavy Metal ◽  
Electrical Resistivity ◽  
Apparent Resistivity ◽  
Apparent Conductivity ◽  
Resistivity Method ◽  
Dug Wells ◽  
Electrical Soundings ◽  
Electrical Resistivity Method ◽  
Agricultural Plants

Abstract Contaminants from waste dumpsites have become sources of concern. Disposed wastes (Heavy metal) from battery industries could contaminate soil, agricultural plants, and groundwater. Therefore, this study aimed at the determination of the migration of heavy metal (Lead) from a Battery Waste Dumpsite using the electrical resistivity method. Using Schlumberger array, fifteen (15) Vertical Electrical Soundings (VES) were carried out around a Battery Waste Dumpsite in Ori –Ile, Ikumapaiyi at Olodo community, Ibadan, Oyo State, Nigeria. Preliminary analyses of VES data were performed and were fed into software (WINRESIST 1.0) for qualitative interpretation to reveal apparent resistivity values, the number of layers, and thickness. Three and four layers of topsoil, sandy-clayed, weathered/fractured basement, and basement were obtained. Various values of lowest apparent resistivity and depths of penetration of leached lead on the four sides of the battery waste dumpsite were obtained. The lowest apparent resistivity values obtained were converted to apparent conductivity and plotted against the distance of each VES point. Five collected water samples from available hand-dug wells around the dumpsite were analyzed for the presence of lead using an Atomic Absorption Spectrometer. Graph of apparent conductivity against VES distance indicated a decrease in conductivities with distance, an indication of reduction of Concentration of lead with distance. The level of Lead ranged from 0.081 to 0.770 mg/L which was above the tolerance level of 0.01 mg/L of WHO and SON, an indication of heavy metal pollution in groundwater. This study has established that lead ions were present in groundwater and had spread to a distance of 80 m from the battery waste dumpsite and were more pronounced on the southern region of the dumpsite.

The Application Research on Underwater Riprap Recognition Using High-Density Resistivity Method

2013 ◽  
Vol 385-386 ◽  
pp. 648-653
Author(s):  
Jin Huang Yu ◽  
Qiang Wang ◽  
Fu Yu Jiang
Keyword(s):  
Surrounding Rock ◽  
High Density ◽  
Application Research ◽  
Geoelectric Model ◽  
Bottom Boundary ◽  
Resistivity Method ◽  
Real World Application ◽  
And Inversion ◽  
Better Than ◽  
Inversion Calculation

We established a typical ripped-rock revetment engineering geoelectric model based the resistivity difference of ripped-rock and its surrounding rock. And we also realized the models’ forward and inversion calculation for different device types of high density resistivity method using finite element method. Results show that the α device could delineate the horizontal scope of the ripped-rock better, and the γ device could reflect the bottom of ripped-rock better than the other three device. In addition, we can also get riprap’s bottom boundary according to the gradient belt of resistivity of the β device. In a real world application, we use the small subdomain filtering technology to enhance the image, better divide the riprap distribution range.

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