Статті в журналах: "Continuous Vertical Electrical Sounding"

1

Issah, Mohammed Mansuru, Akwasi Acheampong Aning, Reginald Mensah Noye, and Patrick Amankwaa Mainoo. "Prospecting for Groundwater Using the Continuous Vertical Electrical Sounding Method." European Scientific Journal, ESJ 14, no. 3 (January 31, 2018): 67. http://dx.doi.org/10.19044/esj.2018.v14n3p67.

Повний текст джерела

Анотація:

2-D CVES surveys using the Wenner configuration was carried out in 22 communities in the Tain District, Ghana. This was done with the objectives of assessing the subsurface geology, identify high groundwater potential zones for drilling high-yielding boreholes that could yield sustainable amount of groundwater. The collected resistivity data were converted from the apparent resistivity to 2-D modelsection using the least-square inversion algorithm with the help of Res2DInv software. The 2-D resistivity model-sections produced a high quality structural resolution leading to the demarcation of the layering of various lithological units, weathered layers and identification of important structures such as joints, fractures and faults. Quantitatively, it can be observed that all the drilled wet wells have aquifer zones between 30 m and 60 m within sandstone, siltstone and phyllite granitic environments. The result of the borehole drill logs revealed that the aquifers were within weathered and fractured zones and is in agreement with the models. The results showed that the boreholes yield within the study area varied between a minimum of 15 litres/min to a maximum 800 litres/min and the mean depth for intercepting aquifer was at about 30 m and below. The study revealed that the potential aquifer zones in the study area are mostly as a result of weathering of the overburden and fracturing of the underlying bedrock. The results suggest that the hydrogeology of the study area is highly complex since the development of groundwater is generally due to secondary porosities.

Стилі APA, Harvard, Vancouver, ISO та ін.

2

J.Ganvir, Vinit, Arjun Singh, Pushpesh Kumar, Amaresh Kr. Singh, and Vineet Kumar. "Analysis Of Electrical Resistivity Data For The Delineation Of Ground Water Prospective Zones At Karchana Block Of Allahabad District. U. P. India." Volume 1 Issue 7 1, no. 7 (September 30, 2018): 1–10. http://dx.doi.org/10.31426/ijamsr.2018.1.7.711.

Повний текст джерела

Анотація:

Electrical resistivity of sounding of Karchana block was conducted to delineating the ground water feasibility and selection of sites for installation of bore wells. The reason for choosing this area have undergone stress for the natural resources like water is continuous declining of ground water due to urbanization and industrialization also it was dark block in 2008. 2 D resistivity imaging technique was utilized. The 2 D resistivity technique/electrical resistivity technique utilized the Schlumberger electrode array configuration because this array is moderately sensitive to both vertical and horizontal structures.Twenty (20) vertical electrical resistivity soundings were acquired with ABEM resistivity Terameter in Schlumberger configuration.

Стилі APA, Harvard, Vancouver, ISO та ін.

3

Nováková, E., M. Karous, A. Zajíček, and M. Karousová. "Evaluation of ground penetrating radar and vertical electrical sounding methods to determine soil horizons and bedrock at the locality Dehtáře." Soil and Water Research 8, No. 3 (July 22, 2013): 105–12. http://dx.doi.org/10.17221/6/2012-swr.

Повний текст джерела

Анотація:

Recently, geophysical methods have been widely used in many fields including pedology. Two of them, ground penetrating radar (GPR) and vertical electrical sounding (VES) were employed at the Dehtáře experimental site with the aim to evaluate their application in the Cambisol and Stagnosol soil types and crystalline bedrock survey in Czech conditions. These measurements were complemented by the classical soil survey using a gouge auger. As a result, interpreted soil and rock environment profiles were obtained, with the identification of boundaries of Bg, C, and R soil horizons and bedrock at various degrees of weathering. The interpretation of measurement records demonstrated suitability of the VES and GPR method application, using GPR for imaging the soil profile and the top of bedrock, while the VES method gave better results in imaging greater depths. The research demonstrated advantages of the geophysical methods such as instancy, continuous imaging, and no disturbance of the subsurface. In spite of needing classical survey data for interpretation of the results obtained by the geophysical methods, their usage can bring better quality to the soil profile imaging.

Стилі APA, Harvard, Vancouver, ISO та ін.

4

MOLANO, C. E., M. SALAMANCA, and R. A. OVERMEEREN. "NUMERICAL MODELLING OF STANDARD AND CONTINUOUS VERTICAL ELECTRICAL SOUNDINGS1." Geophysical Prospecting 38, no. 7 (October 1990): 705–18. http://dx.doi.org/10.1111/j.1365-2478.1990.tb01870.x.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

5

El Makrini, Said, Mustapha Boualoul, Younes Mamouch, Hassane El Makrini, Abdelhamid Allaoui, Giovanni Randazzo, Allal Roubil, Mohammed El Hafyani, Stefania Lanza, and Anselme Muzirafuti. "Vertical Electrical Sounding (VES) Technique to Map Potential Aquifers of the Guigou Plain (Middle Atlas, Morocco): Hydrogeological Implications." Applied Sciences 12, no. 24 (December 14, 2022): 12829. http://dx.doi.org/10.3390/app122412829.

Повний текст джерела

Анотація:

Vertical electrical sounding (VES) as a geoelectrical method has proven its effectiveness throughout the history of groundwater geophysical investigation. In this sense, VES was carried out 47 in the study area with the aim of determining the geometry and limits of Quaternary basaltic aquifer formations and, above all, the location of electrical discontinuities in the area located in the north of Morocco, between the center of Almis Guigou and the city of Timahdite. This area is experiencing an overexploitation of the groundwater due to excessive pumping and the development of intensive agriculture activities, resulting in a continuous decrease in piezometric levels. The processing of the diagrams by WINSEV software showed the presence of an electrically resistant surface level, attributed to basaltic formations, of the Quaternary age, whose thicknesses reach at least 150 m to the SW of the area. This level is superimposed on a moderately conductive horizon which, according to local geology, corresponds to Pliocene marl and limestone alternations. The correlation of VES interpretation models allowed us to elaborate thematic maps and geoelectrical sections which illustrate the vertical and lateral extension of the basaltic reservoir as well as its thickness, which decreases in general from the south-west to the north-east; however, the main electrical discontinuities also correspond to faults and fractures, and they show a NE–SW direction sub-parallel to the major accidents of the Middle Atlas. A prospectivity map of the local aquifer was generated, coinciding with regional fault lines and confirmed by the alignment of very good flowing water boreholes. This geophysical study by electrical sounding shed light on the geometry and extension of the aquifer and opened avenues to draw further conclusions on its physical and hydrodynamic characteristics, as well as to optimize the future siting of groundwater exploitation boreholes through the elaboration of the local aquifer prospectivity map.

Стилі APA, Harvard, Vancouver, ISO та ін.

6

Riss, Joëlle, Juan Luis Fernández-Martínez, Colette Sirieix, Ouassima Harmouzi, Antoine Marache, and Ali Essahlaoui. "A methodology for converting traditional vertical electrical soundings into 2D resistivity models: Application to the Saïss basin, Morocco." GEOPHYSICS 76, no. 6 (November 2011): B225—B236. http://dx.doi.org/10.1190/geo2010-0080.1.

Повний текст джерела

Анотація:

We demonstrated a simple methodology for the reinterpretation of sets of electrical vertical soundings and the production of 2D resistivity models. The method is applied to the northern central part of the subsiding Saïss basin (Morocco) where a series of vertical electrical soundings (VES) were acquired in 1982 and 1984, using the Schlumberger array with current electrodes semispacings between 3 and 3000 m. We describe a methodology used to estimate and sample apparent resistivities collected from traditional single soundings acquired by using a Schlumberger configuration. We then construct a resistivity pseudosection in a format compatible with a Wenner-Schlumberger array to perform 2D electrical tomography. The methodology takes into account the lateral and vertical spatial correlations shown by the apparent resistivities. The tomographic inversions are performed using a commercial inversion software commonly used in industry. Geostatistical tools are used to quantify the spatial correlation between apparent resistivity data. The result is a series of estimated pseudosections that are inverted to produce 2D resistivity models of the basin along geophysical profiles. We focus our attention on one of these profiles (i.e., one 2D resistivity model). The inverted geoelectrical model allows us to propose a geologic model of the basin. Our methodology allows historical and current data carried out using the Schlumberger configuration, to be rapidly reinterpreted in countries where only low-cost methods, such as VES soundings, can be used due to technology and economic constraints. It can also be applied to cases where continuous or pulled-array continuous vertical soundings method, where a tail of electrodes is towed behind a small vehicle while continuously and simultaneously measuring several electrode configurations, is inoperative due to field conditions (survey length, deep layers, and local environmental conditions).

Стилі APA, Harvard, Vancouver, ISO та ін.

7

Chongo, M., J. Wibroe, K. Staal-Thomsen, M. Moses, I. A. Nyambe, F. Larsen, and P. Bauer-Gottwein. "The use of Time Domain Electromagnetic method and Continuous Vertical Electrical Sounding to map groundwater salinity in the Barotse sub-basin, Zambia." Physics and Chemistry of the Earth, Parts A/B/C 36, no. 14-15 (2011): 798–805. http://dx.doi.org/10.1016/j.pce.2011.07.044.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

8

Sambuelli, Luigi, Adriano Fiorucci, Paolo Dabove, Ivan Pascal, Chiara Colombero, and Cesare Comina. "Case history: A 5 km long waterborne geophysical survey along the Po river within the city of Turin (northwest Italy)." GEOPHYSICS 82, no. 6 (November 1, 2017): B189—B199. http://dx.doi.org/10.1190/geo2017-0071.1.

Повний текст джерела

Анотація:

The geologic investigation of water-covered areas is often difficult and inefficient with only the use of traditional surveying techniques (i.e., local drilling and sampling). Waterborne geophysical surveys can offer a valuable alternative to achieve adequate data coverage in a cost-effective way. Two geophysical waterborne methods were combined in this study for the delineation of the submerged subsurface geology along a 5 km stretch of the Po river, within the urban area of Turin. The adopted methods were: continuous vertical electrical sounding (CVES) and ground-penetrating radar (GPR). Special attention was devoted to the accurate geo-referencing of both surveys for combined interpretation. GPR results provide a high-quality representation of the river bed forms, with identification of clear sand dunes in the finer alluvial sediments. CVES resistivity sections enable a deeper characterization, identifying the interface between the shallow alluvial deposits and the deeper low-resistivity marls of the Turin-Hill succession. Our work strengthens the effectiveness of waterborne surveys for geologic prospecting of water-covered and difficult-to-access areas.

Стилі APA, Harvard, Vancouver, ISO та ін.

9

Saraev, Alexander K., Arseny A. Shlykov, and Nikita Yu Bobrov. "Tensor CSRMT System with Horizontal Electrical Dipole Sources and Prospects of Its Application in Arctic Permafrost Regions." Eng 4, no. 1 (February 9, 2023): 569–80. http://dx.doi.org/10.3390/eng4010034.

Повний текст джерела

Анотація:

When studying horizontally-inhomogeneous media, it is necessary to apply tensor modifications of electromagnetic soundings. Use of tensor measurements is of particular relevance in near-surface electrical prospecting because the upper part of the geological section is usually more heterogeneous than the deep strata. In the Enviro-MT system designed for the controlled-source radiomagnetotelluric (CSRMT) sounding method, two mutually perpendicular horizontal magnetic dipoles (two vertical loops) are used for tensor measurements. We propose a variant of the CSRMT method with two horizontal electrical dipole sources (two transmitter lines). The advantage of such sources is an extended frequency range of 1–1000 kHz in comparison with 1–12 kHz of the Enviro-MT system, greater operational distance (up to 3–4 km compared to 600–800 m), and the ability to measure the signal at the fundamental frequency and its subharmonics. To implement tensor measurements with the equipment of the CSRMT method described in the paper, a technique of creating a time-varying polarization of the electromagnetic field (rotating field) has been developed based on the use of two transmitters with slightly different current frequencies and two mutually-perpendicular transmitter lines grounded at the ends. In this way, we made it possible to change the direction of the electrical and magnetic field polarization continuously. This approach allows realization of the technique of tensor measurements using the new modification of the CSRMT method. In permafrost areas, the hydrogenic taliks are widespread. These local objects are important in the context of study of environmental changes in the Arctic and can be successfully explored by the tensor CSRMT method. For the numerical modeling, a 2D model of the talik was used. Results of the interpretation of synthetic data showed the advantage of bimodal inversion using CSRMT curves of both TM and TE modes compared to separate inversion of TM and TE curves. These new data demonstrate the prospects of the tensor CSRMT method in the study of permafrost regions. The problems that can be solved using the CSRMT method in the Arctic permafrost regions are discussed.

Стилі APA, Harvard, Vancouver, ISO та ін.

10

Auken, Esben, and Anders Vest Christiansen. "Layered and laterally constrained 2D inversion of resistivity data." GEOPHYSICS 69, no. 3 (May 2004): 752–61. http://dx.doi.org/10.1190/1.1759461.

Повний текст джерела

Анотація:

In a sedimentary environment, quasi‐layered models often can represent the actual geology more accurately than smooth minimum‐structure models. We present a 2D inversion scheme with lateral constraints and sharp boundaries (LCI) for continuous resistivity data. All data and models are inverted as one system, producing layered solutions with laterally smooth transitions. The models are regularized through lateral constraints that tie interface depths or thicknesses and resistivities of adjacent layers. A priori information, used to resolve ambiguities and to add, for example, geological information, can be added at any point of the profile and migrates through the lateral constraints to parameters at adjacent sites. Similarly, information from areas with well‐resolved parameters migrates through the constraints to help resolve areas with poorly constrained parameters. The estimated model is complemented by a full sensitivity analysis of the model parameters supporting quantitative evaluation of the inversion result. A simple synthetic model proves the need for a quasi‐layered, 2D inversion when compared with a traditional 2D minimum‐structure inversion. A 2D minimum‐structure inversion produces models with spatially smooth resistivity transitions, making identification of layer boundaries difficult. A continuous vertical electrical sounding field example from Sweden with a depression in the depth to bedrock supports the conclusions drawn from the synthetic example. A till layer on top of the bedrock, hidden in the traditional inversion result, is identified using the 2D LCI scheme. Furthermore, the depth to the bedrock surface is easily identified for most of the profile with the 2D LCI model, which is not the case with the model from the traditional minimum‐structure inversion.

Стилі APA, Harvard, Vancouver, ISO та ін.

11

Volosyuk, Valeriy, Simeon Zhyla, Volodimir Pavlikov, Eduard Tserne, Anton Sobkolov, Olexandr Shmatko, and Konstantin Belousov. "Mathematical description of imaging processes in ultra-wideband active aperture synthesis systems using stochastic sounding signals." RADIOELECTRONIC AND COMPUTER SYSTEMS, no. 4 (November 29, 2021): 166–82. http://dx.doi.org/10.32620/reks.2021.4.14.

Повний текст джерела

Анотація:

Mathematical models of the fields of stochastic ultra-wideband signals that are necessary for solving problems of aperture synthesis of images using active radar methods are presented. The expediency of using V-transformations in these problems has been substantiated, the effectiveness of which has already been proven for the mathematical description of ultra-wideband spatio-temporal fields in the methods of passive and active radar, as well as remote sensing, that are used to solve problems of radio astronomy, medicine, navigation. Using modern methods of mathematical analysis and the theory of ultra-wideband systems, the physical essence of radio images obtained with the help of algorithms for coherent and incoherent signal processing is investigated. According to these algorithms, it is proposed to divide images into coherent and incoherent. Coherent images include those in which its amplitude and phase are recorded separately. In the case of an incoherent image, only its amplitude (power or related characteristic) is recorded. To describe of the obtained radio image structure, new concepts of the spectral density of the complex spatial coherence function (SDCSCF) and the spectral density of the spatial autocorrelation function of the amplitude-phase distribution (SDFSAF APD) are introduced. Application-use of functions is expedient and fundamentally necessary for solving problems of aperture synthesis using stochastic ultra-wideband signals. A mathematical description of the structures obtained by aperture synthesis of radio images is given. Here, studies are conducted for the general case of using a continuous (idealized) aperture, and for using an antenna system with spatially separated receiving elements. Simulation of the heuristic synthesized algorithm for constructing incoherent radio images is conducted. The possibility of using antenna arrays and synthesized aperture synthesis algorithms for solving problems of image formation in a survey located directly under the aircraft (at sounding angles close to vertical) are substantiated.

Стилі APA, Harvard, Vancouver, ISO та ін.

12

Drako, M. A., A. M. Korotkevich, and V. N. Porshnev. "On the system of ensuring electrical safety of maintenance works performed on 35 – 750 kV power transmission lines being under induced voltage implemented in the Republic of Belarus." Safety and Reliability of Power Industry 11, no. 2 (July 23, 2018): 154–60. http://dx.doi.org/10.24223/1999-5555-2018-11-2-154-160.

Повний текст джерела

Анотація:

The article studies the matters of physics of interaction of parallel overhead power transmission lines. Cases are presented, where the maximum induced voltage values are expected on individual sections of closely approaching de-energized and energized power transmission lines. Possible scenarios are presented of direct contact with an unearthed conductor (wire) of OPL in the normal operation mode. Substantiation is presented of review of the list of the lines, which, when de-energized or earthed at terminal sections (in the switchgear of substations and power plants) have the values of induced voltage on the earthed conductors, as reduced to the maximum permissible continuous current of the affecting OPL, exceeding 25 V . Criteria are identified to classify OPL as being affected by induced voltage. The article considers organizational and technical procedures applied to provide safe maintenance works under induced voltage on de-energized overhead power lines (OPL) located within an area affected by energized OPL. Attention is given to the detailed description of types of earthing of OPL, line equipment, working section and workplaces used by State Production Association Belenergo. The mathematical apparatus used in the analytical calculations of the induced voltage values has been analyzed. The technical implementation of acceptable schemes of performing the repair and maintenance works on the earthing of de-energized OPL is considered. Performing geophysical ground survey by the method of vertical electrical sounding at places of mounting special low-resistance earthing electrodes is proposed and implemented. The methodology is developed and tested for measuring induced voltage values, which sets the order of induced voltage measurements on de-energized OPL running close to energized OPL with the voltage 110 kV, and higher. Comparative analysis is presented of results of analytical calculations and experimental research. Conclusions are made supporting the approach adopted and confirming the expediency of the system of ensuring electrical safety of maintenance works performed on 35–750 kV power transmission lines being under induced voltage implemented in the Republic of Belarus.

Стилі APA, Harvard, Vancouver, ISO та ін.

13

de Louw, P. G. B., S. Eeman, B. Siemon, B. R. Voortman, J. Gunnink, E. S. van Baaren, and G. H. P. Oude Essink. "Shallow rainwater lenses in deltaic areas with saline seepage." Hydrology and Earth System Sciences Discussions 8, no. 4 (August 10, 2011): 7657–707. http://dx.doi.org/10.5194/hessd-8-7657-2011.

Повний текст джерела

Анотація:

Abstract. In deltaic areas with saline seepage, fresh water availability is often limited to shallow rainwater lenses lying on top of saline groundwater. Here we describe the characteristics and spatial variability of such lenses in areas with saline seepage and the mechanisms that control their occurrence and size. Our findings are based on different types of field measurements and detailed numerical groundwater models applied in the south-western delta of The Netherlands. By combining the applied techniques we could extrapolate in situ measurements at point scale (groundwater sampling, TEC (temperature and electrical soil conductivity)-probe measurements, electrical cone penetration tests (ECPT)) to a field scale (continuous vertical electrical soundings (CVES), electromagnetic survey with EM31), and even to a regional scale using helicopter-borne electromagnetic measurements (HEM). The measurements show a gradual S-shaped mixing zone between infiltrating fresh rainwater and upward flowing saline groundwater. The mixing zone is best characterized by the depth of the centre of the mixing zone Dmix, where the salinity is half that of seepage water, and the bottom of the mixing zone Bmix, with a salinity equal to that of the seepage water (Cl-conc. 10 to 16 g l−1). Dmix manifests at very shallow depth in the confining top layer, on average at 1.7 m below ground level (b.g.l.), while Bmix lies about 2.5 m b.g.l. Head-driven forced convection is the main mechanism of rainwater lens formation in the saline seepage areas rather than free convection due to density differences. Our model results show that the sequence of alternating vertical flow directions in the confining layer caused by head gradients determines the position of the mixing zone (Dmix and Bmix and that these flow directions are controlled by seepage flux, recharge and drainage depth.

Стилі APA, Harvard, Vancouver, ISO та ін.

14

Pfaff, R., H. Freudenreich, T. Yokoyama, M. Yamamoto, S. Fukao, H. Mori, S. Ohtsuki, and N. Iwagami. "Electric field measurements of DC and long wavelength structures associated with sporadic-<i>E</i> layers and QP radar echoes." Annales Geophysicae 23, no. 7 (October 13, 2005): 2319–34. http://dx.doi.org/10.5194/angeo-23-2319-2005.

Повний текст джерела

Анотація:

Abstract. Electric field and plasma density data gathered on a sounding rocket launched from Uchinoura Space Center, Japan, reveal a complex electrodynamics associated with sporadic-E layers and simultaneous observations of quasi-periodic radar echoes. The electrodynamics are characterized by spatial and temporal variations that differed considerably between the rocket's upleg and downleg traversals of the lower ionosphere. Within the main sporadic-E layer (95–110 km) on the upleg, the electric fields were variable, with amplitudes of 2–4 mV/m that changed considerably within altitude intervals of 1–3 km. The identification of polarization electric fields coinciding with plasma density enhancements and/or depletions is not readily apparent. Within this region on the downleg, however, the direction of the electric field revealed a marked change that coincided precisely with the peak of a single, narrow sporadic-E plasma density layer near 102.5 km. This shear was presumably associated with the neutral wind shear responsible for the layer formation. The electric field data above the sporadic-E layer on the upleg, from 110 km to the rocket apogee of 152 km, revealed a continuous train of distinct, large scale, quasi-periodic structures with wavelengths of 10–15 km and wavevectors oriented between the NE-SW quadrants. The electric field structures had typical amplitudes of 3–5 mV/m with one excursion to 9 mV/m, and in a very general sense, were associated with perturbations in the plasma density. The electric field waveforms showed evidence for steepening and/or convergence effects and presumably had mapped upwards along the magnetic field from the sporadic-E region below. Candidate mechanisms to explain the origin of these structures include the Kelvin-Helmholtz instability and the Es-layer instability. In both cases, the same shear that formed the sporadic-E layer would provide the energy to generate the km-scale structures. Other possibilities include gravity waves or a combination of these processes. The data suggest that these structures were associated with the lower altitude density striations that were the seat of the QP radar echoes observed simultaneously. They also appear to have been associated with the mechanism responsible for a well-defined pattern of "whorls" in the neutral wind data that were revealed in a chemical trail released by a second sounding rocket launched 15min later. Short scale (<100 m) electric field irregularities were also observed and were strongest in the sporadic-E region below 110km. The irregularities were organized into 2–3 layers on the upleg, where the plasma density also displayed multiple layers, yet were confined to a single layer on the downleg where the plasma density showed a single, well-defined sporadic-E peak. The linear gradient drift instability involving the DC electric field and the vertical plasma gradient is shown to be incapable of driving the observed waves on the upleg, but may have contributed to the growth of short scale waves on the topside of the narrow unstable density gradient observed on the downleg. The data suggest that other sources of free energy may have been important factors for the growth of the short scale irregularities. Keywords. Ionosphere (Mid-latitude ionosphere; Electric fields and currents; Ionospheric irregularities)

Стилі APA, Harvard, Vancouver, ISO та ін.

15

de Louw, P. G. B., S. Eeman, B. Siemon, B. R. Voortman, J. Gunnink, E. S. van Baaren, and G. H. P. Oude Essink. "Shallow rainwater lenses in deltaic areas with saline seepage." Hydrology and Earth System Sciences 15, no. 12 (December 7, 2011): 3659–78. http://dx.doi.org/10.5194/hess-15-3659-2011.

Повний текст джерела

Анотація:

Abstract. In deltaic areas with saline seepage, freshwater availability is often limited to shallow rainwater lenses lying on top of saline groundwater. Here we describe the characteristics and spatial variability of such lenses in areas with saline seepage and the mechanisms that control their occurrence and size. Our findings are based on different types of field measurements and detailed numerical groundwater models applied in the south-western delta of the Netherlands. By combining the applied techniques we could extrapolate measurements at point scale (groundwater sampling, temperature and electrical soil conductivity (TEC)-probe measurements, electrical cone penetration tests (ECPT)) to field scale (continuous vertical electrical soundings (CVES), electromagnetic survey with EM31), and even to regional scale using helicopter-borne electromagnetic measurements (HEM). The measurements show a gradual mixing zone between infiltrating fresh rainwater and upward flowing saline groundwater. The mixing zone is best characterized by the depth of the centre of the mixing zone Dmix, where the salinity is half that of seepage water, and the bottom of the mixing zone Bmix, with a salinity equal to that of the seepage water (Cl-conc. 10 to 16 g l−1). Dmix is found at very shallow depth in the confining top layer, on average at 1.7 m below ground level (b.g.l.), while Bmix lies about 2.5 m b.g.l. The model results show that the constantly alternating upward and downward flow at low velocities in the confining layer is the main mechanism of mixing between rainwater and saline seepage and determines the position and extent of the mixing zone (Dmix and Bmix). Recharge, seepage flux, and drainage depth are the controlling factors.

Стилі APA, Harvard, Vancouver, ISO та ін.

16

Evgenii, Arzamastsev, Astafiev Pavel, Baidikov Sergei, Konoplin Aleksei, and Ratushniak Aleksandr. "Inductive sounding of layered earth." Izvestiya vysshikh uchebnykh zavedenii Gornyi zhurnal, no. 4 (June 25, 2020): 21–31. http://dx.doi.org/10.21440/0536-1028-2020-4-21-31.

Повний текст джерела

Анотація:

Research aim. The research results in the development of a technology of continuous multi-frequency induction profiling measuring magnetic field components on long survey routes and detailed elaboration of sections by means of remote induction soundings. Research methodology. Theoretical and experimental studies of magnetic field components change patterns of harmonic vertical magnetic dipole over non-uniform layered earth. Mathematical simulation of harmonic vertical magnetic dipole magnetic field in non-uniform layered earth. Analysis of results. Information value of harmonic vertical magnetic dipole magnetic field components characteristics in low-frequency induction zone has been shown when studying non-uniform geoelectric sections together with the obtained results correspondence to the type of the non-uniform section when carrying out remote inductive sounding. 30 "Izvestiya vysshikh uchebnykh zavedenii. Gornyi zhurnal". No. 4. 2020 ISSN 0536-1028 Scope of results. for extended sections of route research (road and railway, oil and gas pipelines, power transmission lines, etc.) process sequence of vertical magnetic dipole magnetic field characteristics measurement has been determined to determine geoelectric properties of a layered section by means of continuous multi-frequency profiling and determination of homogeneous sections of medium structure with their detailing by discrete analysis by the method of remote inductive sounding.

Стилі APA, Harvard, Vancouver, ISO та ін.

17

Gupta, Pravin K., Sri Niwas, and Vinod K. Gaur. "Straightforward inversion of vertical electrical sounding data." GEOPHYSICS 62, no. 3 (May 1997): 775–85. http://dx.doi.org/10.1190/1.1444187.

Повний текст джерела

Анотація:

A straightforward inversion scheme (SIS) has been developed to interpret vertical electrical sounding data. This scheme does not require quasi‐linearization of the inverse resistivity problem and thereby dispenses with the iterative process and the necessity of guessing the number of layers and their resistivities and thicknesses. The entire solution domain is divided into uniform thickness layers, whose scale must be judiciously selected for the desired resolution. The apparent resistivity formula can now be posed as an underdetermined matrix equation whose minimum norm solution is downward continued to obtain the reflection coefficients which, in turn, yield the vertical resistivity distribution. A recurrence relation has been developed especially for this purpose. In general, when data are expected to be noisy, a regressed minimum norm solution is used. Exhaustive tests of the algorithm have established its numerical efficiency. Results of six typical synthetic models, representing diverse geological conditions, as well as results of two field examples are included to demonstrate this claim.

Стилі APA, Harvard, Vancouver, ISO та ін.

18

Dahlin, Torleif. "A cable system for automated vertical electrical sounding." Geoexploration 26, no. 1 (July 1989): 48–49. http://dx.doi.org/10.1016/0016-7142(89)90021-5.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

19

Vladimirov, V. M., V. N. Ratushnyak, V. A. Vyakhirev, and I. V. Tyapkin. "Features of scanning the atmosphere and building radar stations of vertical sounding with a low-element antenna array." Spacecrafts & Technologies 3, no. 4 (December 25, 2019): 237–42. http://dx.doi.org/10.26732/2618-7957-2019-4-237-242.

Повний текст джерела

Анотація:

The mobility and variability of the atmosphere and near-Earth space make it extremely important to obtain experimental information about its dynamic characteristics – speed, wind direction and degree of turbulence. One of the promising methods for obtaining these data is vertical radar sounding of the atmosphere. Vertical sounding radars or wind profilometers are a relatively new type of equipment for studying the atmosphere and thermosphere. Vertical sounding radars are designed for remote non-contact determination of wind speed parameters above the sounding point in the troposphere and the lower part of the thermosphere. To obtain information on the dynamics of atmospheric movements the phenomenon of reflection of electromagnetic waves from turbulent formations and formations of a different nature is used. The temporal position of the reflected signal and the frequency shift due to the Doppler effect give accurate information about the height and speed of movement of atmospheric inhomogeneities. An analysis of the parameters of the reflected signals makes it possible to obtain in real time the altitude-time field of the wind speed and turbulence intensity. The physical principles underlying the operation of these stations allow continuous measurements, regardless of weather conditions. The article discusses the main methods for measuring the vertical profile of the atmosphere and the lower part of the thermosphere, scanning methods and classification of sounding means for the vertical profile of the atmosphere, as well as the features of the functioning and construction of vertical sounding radars with a low-element array.

Стилі APA, Harvard, Vancouver, ISO та ін.

20

Christopher, W. A. P. P., S. B. Harankahawa, Nalin De Silva, A. M. A. N. B. Attanayake, and Pathmakumara Jayasinghe. "Characterization of landslides: a preliminary vertical electrical sounding approach." Journal of the Geological Society of Sri Lanka 21, no. 2 (December 30, 2020): 81. http://dx.doi.org/10.4038/jgssl.v21i2.50.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

21

Dmitriev, V. I., and N. A. Mershchikova. "Mathematical modeling of vertical electrical sounding of quasilayered media." Computational Mathematics and Modeling 8, no. 4 (October 1997): 361–68. http://dx.doi.org/10.1007/bf02404054.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

22

Zlobinskiy, Arkadiy, and Vladimir Mogilatov. "MODERN CONDITION OF TM-POLARIZATION ELECTRICAL PROSPECTING." Interexpo GEO-Siberia 2, no. 2 (2019): 154–57. http://dx.doi.org/10.33764/2618-981x-2019-2-2-154-157.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

23

Adesunloro, Gbenga Michael, Olumodeji Ibukun I., and Itakorode O. Daniel. "Geo-electrical investigation of ground water potential using vertical electrical sounding." World Journal of Advanced Research and Reviews 15, no. 2 (August 30, 2022): 322–29. http://dx.doi.org/10.30574/wjarr.2022.15.2.0817.

Повний текст джерела

Анотація:

Groundwater potential assessment using the vertical electrical sounding (VES) technique was carried out at Ekiti state Southwestern, Nigeria with a view to solving the problem of incessant failure of groundwater boreholes in the study area. A total of 10 VES were carried-out using Schlumberger electrode configuration. The data was interpreted quantitatively using the partial curve matching and computer iteration techniques to generate the first order geoelectric parameters. The borehole lithological log was used to constrain the conventional VES interpretation. The VES results aided by the borehole lithological log reveal four distinct subsurface geologic layers which correspond to Top soil, Lateritic clayey sand, Sand, Sandstone and Consolidated sandstone. The analysis shows that sands at the upper layer within the depth of 2.3 - 76.2 m are unsaturated while sands at depth not less than 100 m in some sampling points are saturated and denote the aquifer units in the study area. Boreholes/deep wells could be cited at these points at depth interval 80 - 100 m. This study has provided an insight to the subsurface condition of the aquifer systems and delineated areas for probable groundwater development in Ekiti State.

Стилі APA, Harvard, Vancouver, ISO та ін.

24

Liu, Tongxin, Guobin Yang, Yaogai Hu, Chunhua Jiang, Ting Lan, Zhengyu Zhao, and Binbin Ni. "A Novel Ionospheric Sounding Network Based on Complete Complementary Code and Its Application." Sensors 19, no. 4 (February 14, 2019): 779. http://dx.doi.org/10.3390/s19040779.

Повний текст джерела

Анотація:

In this paper, complete complementary code (CCC) sequences are applied to a High Frequency (HF) ionospheric sounding network. Ionosondes distributed at multiple locations use the mutually orthogonal CCC sequences to conduct vertical soundings synchronously. At the same time, thanks to the omnidirectional antennas, every station can receive the oblique echoes transmitted from the others. Due to the orthogonality between the code sequences, both vertical and oblique ionograms can be simultaneously obtained and completely separated. Through this method, the sounding efficiency can be enhanced, and the inversion difficulty can be reduced. Further, by using the data assimilation method, vertical and oblique sounding results can be combined to obtain a wide range of regional ionospheric characteristics. To verify the performance of this kind of sounding network, validation experiments are implemented to demonstrate that vertical and oblique ionograms can be obtained independently at the same time and inverted separately and that the maps of foF2 parameters obtained by using the data assimilation method provide more details than single vertical or oblique sounding.

Стилі APA, Harvard, Vancouver, ISO та ін.

25

Harjito, Harjito. "Metode Vertical Electrical Sounding (VES) untuk Menduga Potensi Sumberdaya Air." Jurnal Sains &Teknologi Lingkungan 5, no. 2 (September 23, 2013): 127–40. http://dx.doi.org/10.20885/jstl.vol5.iss2.art6.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

26

SARAVANAN, J., KISHAN SINGH RAWAT, and SUDHIR KUMAR SINGH. "Sub-Surface Investigation Using Vertical Electrical Sounding: Chennai Metropolitan Area." Current World Environment 13, no. 3 (September 22, 2018): 317–30. http://dx.doi.org/10.12944/cwe.13.3.06.

Повний текст джерела

Анотація:

The data or information on the sub-stratum, nature of aquifers, their spatial disposition, their hydrogeological characteristics and other information, are limited particularly in urban context. The study was performed in the Chennai metropolitan area. The objective of the study was to get the sub-surface information of the study area. The vertical electrical sounding was performed at ninety locations to identify the sub surface lithology. The Archaeans consisting of Charnockites, gneisses and dolerite occupy the southern part of the Metropolitan area. The lower portion of gondwanas belonging to the Talchir beds consist of light brown and green colored Shales occurring below the alluvium in the area between Nandanam on the east to Nandambakkam on the west. These Shales are overlying the older crystalline rocks. The lower portion of gondwanas belonging to the Talchir beds consist of light brown and green coloured Shales occurring below the alluvium in the area between Nandanam on the east to Nandambakkam on the west The Tertiary bed comprising friable white and reddish brown Sandstone occurs on the western side near Chembarambakkam and on the northwestern side between Thirunindravur and Villiwakkam. The thickness of the alluvium ranges between 5m on the southern side to a little more than 20m on the east central part of the Metropolitan area.

Стилі APA, Harvard, Vancouver, ISO та ін.

27

Kumar, Dewashish, Shakeel Ahmed, N. S. Krishnamurthy, and Benoit Dewandel. "Reducing ambiguities in vertical electrical sounding interpretations: A geostatistical application." Journal of Applied Geophysics 62, no. 1 (May 2007): 16–32. http://dx.doi.org/10.1016/j.jappgeo.2006.07.001.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

28

Perttu, Nils, Kamhaeng Wattanasen, Khamphouth Phommasone, and Sten-Åke Elming. "Characterization of aquifers in the Vientiane Basin, Laos, using Magnetic Resonance Sounding and Vertical Electrical Sounding." Journal of Applied Geophysics 73, no. 3 (March 2011): 207–20. http://dx.doi.org/10.1016/j.jappgeo.2011.01.003.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

29

Rubaiyn, Al. "PERBANDINGAN INVERSI DATA VERTICAL ELECTRICAL SOUNDING MENGGUNAKAN PERANGKAT LUNAK PROGREES DAN IP2WIN." Jurnal Rekayasa Geofisika Indonesia 4, no. 03 (December 30, 2022): 175. http://dx.doi.org/10.56099/jrgi.v4i03.29526.

Повний текст джерела

Анотація:

Pemodelan inversi data Vertical Electrical Sounding (VES) dengan konfigurasi schlumberger bertujuan untuk menggambarkan kondisi bawah permukaan bumi 1D melalui model variasi resistivitas secara vertikal terhadap kedalaman. Proses pemodelan inversi ini merupakan tahapan yang sangat penting dalam pencitraan geofisika dari suatu data VES. Penelitian ini bertujuan untuk membandingkan keakurasian software Progress dan software IPI2Win dalam inversi data VES. Pengujian data menggunakan data sintetik untuk model tipe kurva H, tipe K dan tipe HK yang ditambahkan noise sebesar 10%. Hasil inversi kurva Vertical Electrical Sounding (VES) tipe H dan tipe HK dapat dimodelkan baik dengan software IPI2Win dibandingkan dengan software Progress. Inversi dengan software Progress sangat bergantung pada tebakan model awal. Keberadaan anomali rendah dan tinggi bawah permukaan dari kurva VES dapat dipetakan dengan menggunakan software IPI2Win dan Progress

Стилі APA, Harvard, Vancouver, ISO та ін.

30

Hodlur, G. K., and Ratnakar Dhakate. "Correlation of vertical electrical sounding and electrical borehole log data for groundwater exploration." Geophysical Prospecting 58, no. 3 (May 2010): 485–503. http://dx.doi.org/10.1111/j.1365-2478.2009.00831.x.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

31

Wijaya, Arif, and Amirin Kusmiran. "IDENTIFIKASI JENIS AKUIFER AIR TANAH MENGGUNAKAN VERTICAL ELECTRICAL SOUNDING KONFIGURASI SCHLUMBERGER." JFT: Jurnal Fisika dan Terapannya 8, no. 1 (June 30, 2021): 10. http://dx.doi.org/10.24252/jft.v8i1.21210.

Повний текст джерела

Анотація:

The availability of clean water is a basic need to meet daily needs. Therefore, the identification of groundwater and its aquifer types was carried out in Labulia, Alor sub-village, Central Lombok Region and Lilir sub-village, Membalan Village, West Lombok Region. The identification of groundwater and the type of aquifer is carried out using the vertical electrical sounding method with the Schlumberger configuration because this method can identify vertical resistivity more accurately than other resistivity methods, such as Wenner. The pseudo resistivity data obtained from these measurements is processed using IPI2Win software and progress. The result of the interpretation was that the aquifer in Olor Agung sub-village was a confined aquifer, while Lilir sub-village was a free aquifer.

Стилі APA, Harvard, Vancouver, ISO та ін.

32

Hertrich, Marian, and Ugur Yaramanci. "Joint inversion of Surface Nuclear Magnetic Resonance and Vertical Electrical Sounding." Journal of Applied Geophysics 50, no. 1-2 (May 2002): 179–91. http://dx.doi.org/10.1016/s0926-9851(02)00138-6.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

33

Hamzah, Umar, Abdul Rahim Samsudin, and Edna Pilis Malim. "Groundwater investigation in Kuala Selangor using vertical electrical sounding (VES) surveys." Environmental Geology 51, no. 8 (July 27, 2006): 1349–59. http://dx.doi.org/10.1007/s00254-006-0433-8.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

34

Sikandar, Pervaiz, Evan W. Christen, and Thomas M. Stein. "Vertical electrical sounding (ves) for salinity assessment of water-bearing formations." Irrigation and Drainage 66, no. 2 (January 4, 2017): 252–62. http://dx.doi.org/10.1002/ird.2094.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

35

Babaiwa, D. A., C. O. Aigbogun, and A. T. Umoru. "Aquifer characterization using vertical electrical sounding in Auchi polytechnic, Auchi, Edo State, Nigeria." Nigerian Journal of Technology 39, no. 3 (September 16, 2020): 925–31. http://dx.doi.org/10.4314/njt.v39i3.35.

Повний текст джерела

Анотація:

The Schlumberger array method was used to carry out a total of eight (8) Vertical Electrical Sounding (VES) with a spread of 350 m in the study area. The Pasi 16-GL Terrameter was used to acquire the data. The data obtained were analyzed with the Winresist 1.0 software to obtain the curves of best fit to the theoretical models. The modeling program converted the apparent resistivity into true resistivity values in 1-D model curves. Five (5) to seven (7) layers were delineated which correspond to the topsoil, sandy clay, clayey sand, sand, dry sandstone and saturated sandstone. The depth to aquifer ranges from 95.0 to 169.6 m with resistivity values ranging from 324.3 to 1524.7 Ωm. Keywords: Apparent resistivity, Aquifer, lithology and vertical electrical sounding.

Стилі APA, Harvard, Vancouver, ISO та ін.

36

Salami, A. S., and E. M. Babafemi. "Delineation of Near-Surface Structural Features Suitable for Groundwater Accommodation Using 1-D and 2-D Resistivity Methods in Igarra, Akoko-Edo, Southwestern Nigeria." Journal of Applied Sciences and Environmental Management 24, no. 7 (August 7, 2020): 1209–15. http://dx.doi.org/10.4314/jasem.v24i7.13.

Повний текст джерела

Анотація:

Electrical resistivity methods using dipole-dipole and Schlumberger configurations of Vertical Electrical Sounding (VES) were carried out to evaluate the near-surface structural and lithological features suitable for groundwater development in parts of Igarra, Southwestern Nigeria. Two profiles with lengths of greater than 350m were carried out. A total of fifteen sounding locations along the profile lines were occupied. Dipole-dipole data were interpreted using DiprofWin software while interpretation of the VES data followed two stages of qualitative and quantitative data interpretation using Resist software. Dipole-dipole interpretation results indicate the occurrence of local fractures while VES interpretation results reveal the typical basement rock profile ranging from topsoil, lateritic sand, weathered front, fractured to fresh basement. The significant variations in terms of persistence and thicknesses of these basement vertical rock profiles were revealed by the geoelectrical correlation panels, which indicate typical basement inhomogeneities over short distances. The local structural domains, the weathered front (where thick) and the fractured basement are demonstrably potential sources of groundwater, at least for domestic and small scale enterprises in this part of Igarra. Keywords: 2-D Pseudosection, Dipole-dipole, Fracture Basement, Vertical Electrical Sounding

Стилі APA, Harvard, Vancouver, ISO та ін.

37

Sanchaa, Aidisa, Nina Nevedrova, Ilya Shaparenko, Aleksandr Shalaginov, and Sergey Babushkin. "GEOELECTRIC STRUCTURE OF THE UIMON BASIN ACCORDING TO GROUND GEOELECTRIC." Interexpo GEO-Siberia 2, no. 2 (2019): 137–44. http://dx.doi.org/10.33764/2618-981x-2019-2-2-137-144.

Повний текст джерела

Анотація:

The article presents the results of studies of the geoelectric structure of the Uimon depression of the Gorny Altai using the complex of geoelectric methods, which includes electromography, vertical electrical sounding and transient electromagnetic sounding. According to the data of the complex, the near-surface and deep geoelectric characteristics of sedimentary filling were obtained.

Стилі APA, Harvard, Vancouver, ISO та ін.

38

Ojo, A., E. Babafemi, E. Faleye, and O. Shado. "Integrating Resistivity Techniques for Optimum Groundwater Exploration and Development within a Hotel Facility in Osogbo, Southwestern Nigeria." Journal of Applied Sciences and Environmental Management 25, no. 2 (April 15, 2021): 233–38. http://dx.doi.org/10.4314/jasem.v25i2.15.

Повний текст джерела

Анотація:

This work is an attempt to combine dipole-dipole profiling and vertical electrical sounding techniques of electrical resistivity methods to investigate the groundwater potential within the premises of a 3-star hotel facility in Osogbo, Nigeria by delineating the geoelectric layers, delineating the low resistivity layers, determining the lithologies and hence, delineating the groundwater bearing zones. The five vertical electrical sounding data were collected along two pre-surveyed dipole-dipole traverses at right angle to each other beside the fences of the premises using the ABEM SAS 300c terrameter. The observed data were interpreted quantitatively using curve matching and computer-assisted iteration method using the WinResist and Dipro software. The results of the inversion show that the lithology comprises of the top soil and an intermittent sequence of sand and lateritic clay having varying resistivity and thickness. The aquiferous layer was observed to be located at a depth of 23 m to 25 m due to the low resistivity and high thickness of the aquiferous layer. The result of the 2-D imaging closely correlates with the result of the vertical electrical sounding. Thus, combining these techniques in groundwater investigation has achieved similar result as the Werner technique and has reduced ambiguity and error in positioning for drilling. Keywords: Resistivity, Groundwater Exploration, Dipole-Dipole

Стилі APA, Harvard, Vancouver, ISO та ін.

39

Ponomarchuk, S. N., V. P. Grozov, N. V. Ilyin, V. I. Kurkin, A. V. Oinats, M. S. Penzin, A. V. Podlesnyi, and M. V. Tsedrik. "Backscatter Ionospheric Sounding by a Continuous Chirp Signal." Izvestiya vysshikh uchebnykh zavedenii. Radiofizika 64, no. 8-9 (2021): 655–71. http://dx.doi.org/10.52452/00213462_2021_64_08_655.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

40

Osele, Chika, Ajana Onwuemesi, Emmanuel Anakwuba, and Augustine Chinwuko. "Application of vertical electrical sounding (VES) for groundwater exploration in Onitsha and environs, Nigeria." International Journal of Advanced Geosciences 4, no. 1 (January 12, 2016): 1. http://dx.doi.org/10.14419/ijag.v4i1.5594.

Повний текст джерела

Анотація:

<p>Surface geo-electrical survey using vertical electrical sounding (VES) method has been carried out in Onitsha and environs in southwestern part of Anambra state in order to determine the aquifer characteristics and groundwater potential of the area. Eleven vertical electrical soundings were carried out within the area of study using schlumberger array configuration. The interpretation of the vertical electrical sounding (VES) data revealed three to five geoelectric units with depth to the aquiferous layers ranging from 21 to 78m and resistivity of the saturated layers varying between 20 and 5600 ohm-m. Aquifer characteristics such as transmissivity and hydraulic conductivity calculated from interpretated VES result ranged from 2.55m2/day to 29.01m2/day and 0.03m/day to 1.37m/day respectively. This result shows that the water saturated sandstone units of the study area is hydrological good and capable of producing optimum groundwater yield. Furthermore, borehole could be drilled at depth between 40 and 110m in the area for sustainable water supply and hydrochemical study carried out to determine the water quality for domestics and municipal purposes.</p>

Стилі APA, Harvard, Vancouver, ISO та ін.

41

König-Langlo, G., and H. Gernandt. "Compilation of ozonesonde profiles from the Antarctic Georg-Forster-Station from 1985 to 1992." Earth System Science Data Discussions 1, no. 1 (September 22, 2008): 1–13. http://dx.doi.org/10.5194/essdd-1-1-2008.

Повний текст джерела

Анотація:

Abstract. On 22 May 1985 the first balloon-borne ozonesonde was successfully launched by the staff of Georg-Forster-Station (70°46' S, 11°41' E). The following weekly ozone soundings mark the beginning of the continuous investigation of Germany to study the vertical ozone distribution in the southern hemisphere. In 1985 these ozone soundings have been the only record showing the change of vertical ozone distribution in the southern polar stratosphere in September and October. The regular ozone soundings from 1985 until 1992 are a valuable reference data set since the chemical ozone loss became a significant feature in the southern polar stratosphere. The balloon-borne soundings were performed at the upper air sounding facility of the neighbouring station Novolazarevskaya, just 2 km apart from Georg-Forster-Station. Till 1992, ozone soundings were taken without interruption. Afterwards, the ozone sounding program was moved to Neumayer-Station (70°39' S, 8°15' W) 750 km further west.

Стилі APA, Harvard, Vancouver, ISO та ін.

42

Ageev, V. V., and D. V. Ageev. "STUDYING FROZEN CROSS-SECTIONS IN YAKUTIA USING NEAR-FIELD TRANSIENT ELECTROMAGNETIC SOUNDING AND INDUCED POLARIZATION VERTICAL ELECTRICAL SOUNDING." Engineering Geology, no. 2 (January 1, 2017): 64–69. http://dx.doi.org/10.25296/1993-5056-2017-2-64-69.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

43

Widodo, Priyo, Hadi Utomo, Yekti Utami, Mazda Aina Sukowati, and Waterman Sulistyana Bargawa. "Main Aquifer Analysis Using Vertical Electrical Sounding to Determine the Location of Drilling Well." RSF Conference Series: Engineering and Technology 1, no. 1 (December 23, 2021): 95–104. http://dx.doi.org/10.31098/cset.v1i1.377.

Повний текст джерела

Анотація:

Water is an important aspect of life. People need clean water for their household needs. Problems arise when the supply of clean water does not meet the needs of the community as felt by the residents of Madurejo Village, Prambanan District, Sleman Regency, Yogyakarta. In the dry season, the groundwater level decreases so that the air supply decreases. This study aims to analyze the existence of aquifers that can meet the needs of the community throughout the year. This research has a research flow starting from surveys, field orientation, field measurements, analysis of measurement results, then the location of aquifer locations. The measurement method in the field uses a vertical sounding geoelectric method with a Schlumberger array. This measurement has the main objective of identifying the subsurface as a potential aquifer in Madurejo Village, Prambanan District, Sleman Regency, Yogyakarta. Method of measuring rock resistivity by injection of subsurface currents. Data retrieval is carried out at 2 points with a track length (AB) of 150 to 250 meters. for processing using interpretation software with the final result in the form of rock lithology. This research uses IP2WIN Software and Progress 3.0. The results showed that the two points were close to the existence of the aquifer. The software analyzes at a depth of 9.35-51.5 m at sounding point 1 and 60-80.8 m at sounding point 2 is an aquifer layer. The study concluded that wells could be drilled at both points.

Стилі APA, Harvard, Vancouver, ISO та ін.

44

Alekseev, Ivan, and Evgeny Abakumov. "Vertical electrical sounding of soils and permafrost of marine terraces of Gronfjord (Svalbard archipelago)." Czech Polar Reports 6, no. 2 (July 1, 2016): 210–20. http://dx.doi.org/10.5817/cpr2016-2-19.

Повний текст джерела

Анотація:

Vertical electrical resistivity sounding (VERS) of soil-permafrost strata has been performed during the field work within the sea terraces of Gronfjord (Svalbard archipelago, West Spitsbergen island). Vertical electrical resistivity sounding of soil-permafrost strata was performed by portable device LandMapper. Then these data have been analyzed via ZondIP software (1d model). Apparent electrical resistivity values on the soil-permafrost strata usually change rapidly. It was established that studied soils with different origin and morphological properties are referred to 2 trunks, 2 orders, 4 types and 7 subtypes. Histic Gleysols, Cryosols, Gleysols and their subtypes have been investigated within the key plots (Grendasselva, Aldegonda rivers and catena on the sea terrace in surroundings of Barentsburg aerodrome). Several trends in profile distribution of electrical resistivity values have been distinguished. The main is connected with monotonous increasing of electrical resistivity values with a depth. Values of apparent electrical resistivity increase rapidly on the border of active layer-permafrost layer. The contrasts in profile distribution of electrical resistivity values are caused mainly by differences in water content, texture class and degree of strata heterogeneity (due to cryogenic processes). The depths of active layer-permafrost boundary have been distinguished using ZondIP software. Regional differences in this indicator may be explained not only by local differences in thermal regime of soil and permafrost layers, but also by different character of anthropogenic influence on key plots. Vertical electrical resistivity sounding method provides significant information for understanding soil electrical properties without any mechanical disturbances of soil cover. The data obtained is clearly coincided with field work data on soil morphology.

Стилі APA, Harvard, Vancouver, ISO та ін.

45

P.O., Eke, and Igoma C. "Overburden Properties of Abua in Rivers State, Nigeria, from Vertical Electrical Sounding." Asian Journal of Applied Science and Technology 04, no. 03 (2020): 61–68. http://dx.doi.org/10.38177/ajast.2020.4309.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

46

Jha, Madan K., S. Kumar, and A. Chowdhury. "Vertical electrical sounding survey and resistivity inversion using genetic algorithm optimization technique." Journal of Hydrology 359, no. 1-2 (September 2008): 71–87. http://dx.doi.org/10.1016/j.jhydrol.2008.06.018.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

47

Chen, You-Cheng, Jui-Pin Tsai, Liang-Cheng Chang, Ping-Yu Chang, and Helen Lin. "Estimating Hydraulic Conductivity Fields in Composite Fan Delta Using Vertical Electrical Sounding." Water 10, no. 11 (November 9, 2018): 1620. http://dx.doi.org/10.3390/w10111620.

Повний текст джерела

Анотація:

Hydraulic conductivity (K) is crucial for groundwater studies and is conventionally obtained through pumping tests, which are costly due to well installation, resulting in a limited amount of data. Recent studies have addressed this limitation by estimating K through the integration of a pumping-test K and electrical resistivity measurements. While this approach is suitable for local areas, it cannot readily be applied to determine K fields for the composite fan delta. This study proposes and demonstrates an advanced method to estimate the K’s spatial distribution of a composite fan delta. The proposed method included data classification, linear regression, and kriging interpolation. Data classification was conducted using a physical-based zonation method. The K and formation factor (F) data pairs were classified into several groups. Linear regression was used to develop K-F mapping for each group. The regression results showed a good correlation between K and F in each group. These K-F mappings were verified by additional pumping tests. These results indicate that estimation errors were between 7 m/day and 58 m/day, and the correlation coefficient of each data group was greater than 0.8. Based on these regression equations and ordinary kriging method, the detailed K spatial distribution of the study area was derived. According to these results, the proposed method is efficient and economical to delineate K’s spatial features for regional groundwater systems and can benefit groundwater-related studies.

Стилі APA, Harvard, Vancouver, ISO та ін.

48

Ogunbo, Jide Nosakare, Emmanuel Abiodun Mamukuyomi, Wahab Stephens Adepoju, Harrison Adebowale, Olamide Akinro, and Chukwuebuka Richard Ukaegbu. "Panoramic azimuthal Schlumberger Vertical Electrical Sounding for fracture orientation and anisotropy quantification." Heliyon 4, no. 12 (December 2018): e00998. http://dx.doi.org/10.1016/j.heliyon.2018.e00998.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

49

Arliska, Ervy Afriani, Pou Anda, and Erzam Sahaluddin Hasan. "IDENTIFIKASI INTRUSI AIR LAUT MENGGUNAKAN METODE VERTICAL ELECTRICAL SOUNDING DI KECAMATAN SAWA." JGE (Jurnal Geofisika Eksplorasi) 8, no. 3 (November 29, 2022): 197–209. http://dx.doi.org/10.23960/jge.v8i3.223.

Повний текст джерела

Анотація:

Air adalah kebutuhan dasar manusia yang digunakan untuk berbagai keperluan dalam kehidupan. Dalam sebuah komunitas , air bersih sering merupakan masalah serius manakala tidak tersedia dalam jumlah yang cukup dan memenuhi baku mutu terutama daerah-daerah tertentu yang belum memiliki pipanisasi, atau daerah pemukiman dipinggir laut. Tujuan penelitian ini adalah menentukan pengaruh intrusi laut terhadap sumber air bawah tanah melalui karakteristik litologi batuan bawah permukaan serta menetukan kondisi aquifer yang mungkin terintrusi air laut berdasarkan data kualitas air sumur gali di Desa Laimeo-Ulu Kecamatan Sawa. Metode yang digunakan adalah metode geolistrik tahanan jenis Vertical Electrical Sounding (VES) yang semakin luas penggunaannya untuk mempelajari struktur bawah permukaan. Hasil interpretasi data setiap lintasan pengukuran teridentifikasi adanya intrusi air laut yang diindikasikan oleh nilai resistivitas 0,5-5 ohm.m sebagai lapisan pasir dan kerikil. Meskipun lapisan ini diduga sebagai aquifer dan telah terintrusi air laut namun letaknya sekitar 6 - 12 dibawah permukaan sedangkan kedalaman sumur gali rata-rata 3 m. Selain itu, ada lapisan lempung yang impermeable terletak di atas lapisan yang terintrusi air laut. Dengan demikian disimpulkan bahwa air sumur gali masih tergolong sebagai air segar dan dapat dikomsumsi dan untuk berbagai keperluan lain. Adalah perlu dikombinasikan dengan metode lain untuk menilai sebaran intrusi air secara spasil atau dua dimensi.

Стилі APA, Harvard, Vancouver, ISO та ін.

50

Khalil, Mohammad Ibrahim. "Coastal groundwater aquifer characterization from geoelectrical measurements- A case study at Kalapara, Patuakhali, Bangladesh." Journal of Applied Geology 5, no. 1 (August 11, 2020): 1. http://dx.doi.org/10.22146/jag.55009.

Повний текст джерела

Анотація:

Vertical electrical sounding has been carried out in a coastal area in the southern part of Bangladesh to locate the groundwater aquifers containing fresh water. The Interpex1X1Dv3 computer program was used to process the field apparent resistivity data sets obtained from the vertical electrical sounding. Geoelectric layers were identified in the context of resistivity and thickness from the vertical electrical sounding data. From the initial parameters layered model was achieved using the inversion technique. Correlation of the obtained layer model with a nearby lithologic log concludes the groundwater aquifer system of the area. From the electrical properties of the subsurface layers, water bearing layers were detected and characterized. Very fine sand geoelectric layer with a thickness varying from 20 to 143 meters is an upper aquifer and has 0.66–14.02 Ωm apparent resistivity value. Fine sand geoelectric layer with 0.21-5.99 Ωm apparent resistivity value is lower aquifer with maximum thickness ~250 meters. From the resistivity value, it is observed that the upper aquifer contains saline to brackish-fresh water while the resistivity value of the lower aquifer indicates that it contains saline water. The water quality of the upper zone varies geographically from the southern to the northern part in the investigated area. The water quality of the upper aquifer is fresh in the northern part of the study while lower aquifer contains saline water there.

Стилі APA, Harvard, Vancouver, ISO та ін.

Статті в журналах з теми "Continuous Vertical Electrical Sounding"

Оформте джерело за APA, MLA, Chicago, Harvard та іншими стилями