scholarly journals Application of Vertical Electrical Sounding for Study the Proposed dam site at Wadi Ma’doo, Shabwah Governorate, Yemen

2020 ◽  
Vol 3 (2) ◽  
Keyword(s):  
Two Dimensions ◽  
Shallow Foundation ◽  
Vertical Electrical Sounding ◽  
Electrode Spacing ◽  
Geophysical Investigation ◽  
Engineering Structures ◽  
Geoelectric Section ◽  
True Resistivity ◽  
Dam Site ◽  
Electrical Sounding

Application of geophysical investigation has been carried out using Vertical Electrical Sounding (VES) at the proposed site in wadi Ma’doo, Shabwah Governorate, Yemen to determine the geophysical parameters that can be used to evaluate the subsurface geological layering characteristics of the selection proposed site for dam construction. The Schlumberger array was used for the data acquisition. One-dimensional numerical inversion of individual DC resistivity was used to enhance the processing of the results for better achievement of the aim of the study. Model obtained from the 2D inversion of each VES were used for construction of geoelectric section which exhibit the main geoelectric characteristics of the geological units present in the site. The interpretation of the field data was carried out using the IP12WIN software, which converts the apparent resistivity as a function of electrode spacing to the true resistivity as a function of depth in two dimensions. The interpretation results showed that the geoelectric section consists of three layers namely: boulders and gravels, sandy to pebbly and hard limestone. The layer resistivities and thicknesses range from 18.17 to 746.20 Ω.m/0.20 to 1.084 m, 53 to 60 Ω.m/ 0.20 to 3.059 m and 455 to 1890 Ω.m, respectively. The investigation revealed that the limestone rocks is suitable for shallow foundation for proposed dam engineering structures.

scholarly journals Evaluating the Earth Subsurface for Civil Engineering Site Characterization in Agege, Southwest Nigeria Using Integrated Geoelectrical and Multichannel Analysis of Surface Wave (MASW)

2021 ◽  
pp. 1-11
Author(s):  
O. J. Airen ◽  
K. K. Oboshenure
Keyword(s):  
Surface Wave ◽  
Civil Engineering ◽  
Vertical Electrical Sounding ◽  
Geophysical Investigation ◽  
Clayey Sand ◽  
Engineering Structures ◽  
Geoelectric Section ◽  
Multichannel Analysis ◽  
Electrical Sounding ◽  
2D Resistivity

A geophysical investigation involving 1D Vertical Electrical Sounding (VES), 2D Electrical Resistivity Imaging (2D ERI) and Multichannel Analysis of Surface Wave (MASW) has been carried out at Agege, Lagos, Nigeria with a view to delineating the subsurface stratigraphy and locate some competent strata/stratum for founding civil engineering structures. Six (6) 200 m long traverses were established within the study area. Along these traverses, 2D ERI were carried out adopting Wenner electrode configuration. Vertical Electrical Sounding (VES) adopting Schlumberger electrode array were carried out at selected points along profiles 1, 2 and 3 to determine the lithological sequence at depth. MASW data also were acquired along traverses 1, 2 and 3. The data were processed and the result yielded interpretable 2D resistivity structure and geoelectrical parameters (layer resistivity, thicknesses and depth) from the VES. The interpreted VES results were used to generate geoelectric section while the MASW resulted in 2D velocity sections. Three subsoils including topsoil, clay and clayey sand/sand were delineated beneath the study area. The resistivity and thickness range of the layers are; topsoil (34.0-54.6 ohm-m, 0.9 – 1.7 m), clay (10.3 – 17.7 ohm-m, 8.9 – 12.3 m) and clayey sand/sand (48.9 – 323 ohm-m) while the S-wave velocity range for the subsoil falls between 40 – 500 m/sec.

Application of Electrical Resistivity in Buildings Foundation Investigation in Ibese Southwestern Nigeria

2014 ◽  
Vol 1 (2) ◽  
pp. 91-102
Author(s):  
Falae Philips Omowumi
Keyword(s):  
Shallow Foundation ◽  
Geophysical Investigation ◽  
Engineering Structures ◽  
Building Site ◽  
Southwestern Nigeria ◽  
2D Inversion ◽  
One Dimensional ◽  
Southwest Nigeria ◽  
Electrical Sounding ◽  
Geological Units

Application of geophysical investigation has been carried out using Vertical Electrical Sounding (VES) at the proposed building site in Ibese Southwest Nigeria to determine the geophysical parameters that can be used to evaluate the structural competence of the subsurface geological characteristics of the site for construction purposes and building development. The Schlumberger configuration was used for the data acquisition. One-dimensional numerical inversion of individual DC resistivity was used to enhance the processing of the results for better achievement of the aim of the study. Models obtained from the 2D inversion of each VES were used for construction of geo-electric sections which exhibit the main geo-electric characteristics of the geological units present in the area. The interpretation results showed that the geo-electric sections consist of three-four layers namely: topsoil, pebble clay, limestone and sand/limestone. The layer resistivities and thicknesses range from 11 - 404 Ohm-m/0.4 - 1.5 m, 2-210 Ohm-m/ 0.8 - 9.2m and 33 - 160Ohm-m respectively. The investigation revealed that the sand/limestone litho unit is to be the most competent for shallow foundation for small to medium engineering structures.  

scholarly journals Groundwater Potential Assessment Using Vertical Electrical Sounding and Magnetic Methods: A Case of Adilo Catchment, South Nations, Nationalities and Peoples Regional Government, Ethiopia

2021 ◽  
Vol 2021 ◽  
pp. 1-11
Author(s):  
Mulugeta Markos ◽  
Abel Saka ◽  
Leta Tesfaye Jule ◽  
N. Nagaprasad ◽  
Krishnaraj Ramaswamy
Keyword(s):  
Groundwater Potential ◽  
Vertical Electrical Sounding ◽  
Magnetic Data ◽  
Electrode Spacing ◽  
Regional Government ◽  
Geoelectric Section ◽  
Current Electrode ◽  
Large Thickness ◽  
Magnetic Methods ◽  
Electrical Sounding

Vertical electrical sounding and magnetic methods were carried out to assess groundwater potential in Adilo catchment, Kembata Tembaro Zone, South Nations, Nationalities and Peoples Regional Government, Main Ethiopian Rift. The data were acquired from eight VES points using Schlumberger electrode arrays with maximum half current electrode spacing ( AB / 2 = 500 ) and 253 magnetic data points were analyzed. The qualitative analysis of VES data was accomplished by using curves, apparent resistivity, and pseudodepths, and the quantitative interpretations of the VES data were constructed by the VES data using IPI-Res3, IPI2Win, and surfer software and constructing geoelectric section along with profiles and lithological information from the borehole and Geosoft interpretation was used for magnetic data. The VES results of the data revealed five geoelectric layers which differ in degree of fracturing, weathering, and formation. The upward continued magnetic field map anomaly to 560 m illustrated northwestern to the southwest; areas have a low magnetic anomaly. Examining the potential aquifer of profile one’s geoelectric section, the horizons of layer four were better potential aquifers as the highly fractured and weathered ignimbrite zone of layer five of VES13 was 219 m deeper than the depths of the other VES points, and along with profile two geoelectric sections, the horizon of layer four VES23 layer five has the lowest resistivity with large thickness at a depth of 253 m. Thus, the low resistivity and the large thickness of these formations are an indication of the high yield of groundwater potential in the study area.

scholarly journals Geophysical Assessment of Groundwater Vulnerability to Diesel Contamination at a Telecommunication Mast in Adebayo Area, Ado-Ekiti, Southwestern Nigeria

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Olaseeni Olayiwola ◽  
Fagbemigun Tokunbo ◽  
Ojo Bosede ◽  
Amosun Joel ◽  
Oyebamiji Ajibola
Keyword(s):  
Electrical Resistivity ◽  
Groundwater Vulnerability ◽  
Diesel Oil ◽  
Vertical Electrical Sounding ◽  
Geophysical Investigation ◽  
Southwestern Nigeria ◽  
Geoelectric Section ◽  
Resistivity Method ◽  
Electrical Sounding ◽  
Electrical Resistivity Method

Abstract An appraisal of the groundwater vulnerability to contamination risk at Adebayo in Ado-Ekiti, Southwestern Nigeria, was carried out using the electrical resistivity method of geophysical prospecting. Two traverses of length 100 m each were established for both vertical electrical sounding (VES) and dipole-dipole. Six (6) Vertical Electrical Sounding (VES) and 2-D dipole-dipole profiling techniques of the electrical resistivity method were adopted for the geophysical investigation. The results show variations in resistivity values, depicting four to five geologic layers: the topsoil, laterite, weathered layer, fractured, and the fresh basement. It was observed from the correlation of the geoelectric section and 2-D resistivity image along traverse 1 (TR1) that the groundwater in the study area flows towards the southwestern part, and the fractured basement serves as a migration pathway to the diesel oil in the same direction as groundwater flow. The fractured basement (Well 2) with no lateritic cover has higher resistivity values compare to the fracture zone that was found directly under the mast which was overlain by the laterite. Comparing the resistivity values of Well 1 and 2, Well 2 that was drilled into the fractured basement has more traces of the contaminant than Well 1.

scholarly journals GEOPHYSICAL INVESTIGATION OF GROUNDWATER POLLUTION RESULTING FROM LEACHATE FLOW AT IKOTO AND ORU DUMPSITES IN OGUN STATE OF NIGERIA

2020 ◽  
Vol 6 ◽  
pp. 1
Author(s):  
Adetoro Temitope Talabi ◽  
Taiwo Olakunle Roy-Layinde ◽  
Rasaki Kola Odunaike ◽  
Hamid Titilope Oladunjoye ◽  
Aina Opeyemi Adebanjo
Keyword(s):  
Groundwater Pollution ◽  
Health Hazard ◽  
Subsurface Layer ◽  
Groundwater Table ◽  
Electrode Spacing ◽  
Geophysical Investigation ◽  
The Road ◽  
Ogun State ◽  
Electrical Resistivity Survey ◽  
Electrical Sounding

An electrical resistivity survey was carried out to detect the level of groundwater pollution on Oru and Ikoto dumpsites respectively as it was observed that the dumpsites were sited ignoring the environmental and health hazard. The survey was conducted using ABEM model terrameter with schlumberger array for 1-D vertical electrical sounding (VES) of electrode spacing ranging from 0.25m to 4m. Four VES was conducted on each dumpsite with length between 1m to 120m. The data obtained from the field were interpreted using WINRESIST from which the curve types of each study area were identified. On Oru dumpsite, measurement of VES1 was taken on the dumpsite, VES2 was taken 20m away from the dumpsite, VES3 and VES4 were taken across the road serving as control. Here, there is indication of leachate pollution in VES1 (layer 2) and VES2 (layer 3) while VES3 and VES4 are leachate free, but this leachate present in VES1 and VES2 cannot penetrate into the groundwater table because of the stratigraphy of the area.  At Ikoto dumpsite, measurement of VES4 was taken on the dumpsite, VES1 and VES2 were taken 30m away from the dumpsite on both sides, and while VES3 was taken across the Lagos/Ibadan expressway, serving as control. There is indication of leachate pollution in VES4 (layer2) while in VES1, VES2 and VES3 there is no presence of leachate flow. The leachate present in VES4 can infiltrate into the groundwater table through the highly porous and permeable material in the subsurface layer of the location.

scholarly journals Application of Vertical Electrical Sounding (VES) Resistivity Method to determine a well recommendation point at deep-groundwater exploitation

2021 ◽  
Vol 1 (2) ◽  
pp. 8-13
Author(s):  
Taufiq Taufiq ◽  
Maharani Maharani ◽  
H D Mega
Keyword(s):  
Water Layer ◽  
Potential Difference ◽  
Vertical Electrical Sounding ◽  
Electrode Spacing ◽  
Daily Consumption ◽  
Measuring Point ◽  
Groundwater Exploitation ◽  
Resistivity Method ◽  
Electrical Sounding ◽  
Almost All

The demand of fresh water to develop of life community is very important, where almost all construction activities is required a water such as irrigating rice fields, building infrastructure, and to daily consumption. To obtain a good quality of groundwater, several parameter must be specified such as the depth of groundwater, thickness of the source, and resistivity value of rock. In this case, we try to applied Vertical Electrical Sounding (VES) resistivity method with Schlumberger configuration on one of Pamsimas Project to answer that parameter. VES Resistivity method is one of the active methods in geophysical study based on electrical properties of the subsurface rock by injecting electric current (I) into the earth and record the potential difference (?V) produced to the surface. From the results of current and potential difference measurements for each electrode spacing (AB/2) different then be lowered resistivity variations in the value of each layer below the measuring point (sounding points). After the acquisition on 3 points at Pandansari Village (PS-01, PS-02, PS-03), we get the result on PS-01, the water layer is indicated on the depth 60-80 meters with resistivity values equal than 36.7-50 ?m. On PS-02, the water layer is indicated on the depth 50-100 meters with resistivity values equal than 18.7-40 ?m. On PS-03, the water layer is indicated on the depth 30-60 meters with resistivity values equal than 52.8-70 ?m. Afterthat, we run 2D-pseudosection to know the distribution of groundwater layer in subsurface and get the thickness of groundwater is 20-50 meter with depth 40-80 meter. Based on this result, the PS-01 is the best point to make a well-exploitation on South Pandansari Pamsimas Project.

scholarly journals Geophysical and Geotechnical Studies of a Proposed Structure at Akure, Southwestern Nigeria

2018 ◽  
pp. 1-12
Author(s):  
Ilugbo Stephen Olubusola ◽  
Adebo A. Babatunde ◽  
Ajayi Oluwasayo Adegbola ◽  
Adewumi Olufemi Olaoluwa ◽  
Edunjobi Hazeez Owolabi
Keyword(s):  
Clay Content ◽  
Geotechnical Investigation ◽  
Cone Penetration ◽  
Geophysical Investigation ◽  
Engineering Structures ◽  
Southwestern Nigeria ◽  
Weathered Layer ◽  
Electrical Sounding ◽  
Geoelectric Resistivity ◽  
Geotechnical Studies

Geophysical and geotechnical studies were carried out at a proposed location for the construction of a multi-storey structure in Akure, Southwestern, Nigeria. The aim was to ascertain the suitability of this location for both Founding and Engineering structures. The geophysical investigation involved the Vertical Electrical Sounding (VES) technique using the Schlumberger configuration, Dipole-Dipole Horizontal Profiling and a geotechnical investigation. A total of twenty-one (21) VES and five (5) Cone Penetration Test (CPT) locations were occupied within the study site. Dipole-Dipole Horizontal Profiling was occupied along traverses 1 and 2 within the investigated area. The electrode separation varies from 1 to 75 m. The investigation delineated three major layers which are topsoil, which is excavated before any foundation is laid. The second layer delineated was lateritic and the last was weathered layer. From the result obtained, depth to lateritic layer ranges from 1.1 to 9.0 m while resistivity defining the lateritic layer ranges from 150 Ωm to 792 Ωm. Some of the sounding curves generated over the VES stations and Dipole-Dipole Horizontal Profiling fairly correlated with those of the CPT profile. The high cone penetration resistance recorded at CPT point 4 and 5 is manifested as high geoelectric resistivity values recorded at VES 13. This shows that the soil has fairly low clay content. It also seen from the study that the geophysical studies has a greater depth penetration, and it also provide better layer characterization compared to geotechnical studies. The choice of foundation material, clay content and topography elevation should be taken into cognizance, since the load bearing capacity of the lateritic layer was appreciably high.

scholarly journals Geophysical and Geotechnical Site Characterization at Lagos Central Area of Lagos State, Nigeria

2019 ◽  
Vol 6 (1) ◽  
Author(s):  
Rafiu Adegbola ◽  
Kayode Oyedele ◽  
Elizabeth Abidoye
Keyword(s):  
Central Area ◽  
Maximum Load ◽  
Shallow Foundation ◽  
Silty Sand ◽  
Cone Penetration ◽  
Engineering Structures ◽  
Shallow Subsurface ◽  
Subsurface Geology ◽  
Electrical Sounding ◽  
A Site

Introduction: Geophysical characterization refers to the collection of information associated with subsurface features. Geotechnical involves engineering structural performance studies which are used to obtain information on the physical properties of soil and rock around a site to design earthworks and foundations for proposed structures and for repair of distress to earthworks and structures caused by subsurface conditions. Aim: The study was aimed at characterizing the subsurface formations for the purpose of determining its capacity to withstand engineering structures. Materials and Methods: Geophysical techniques involving eight (8) vertical electrical sounding (VES) and Wenner array were carried out with two (2) traverses. Geotechnical investigation involving cone penetration test (CPT) was also carried out. Results: The results obtained were presented as 1D resistivity profiles and Pseudo-sections of 2-D. Three (3) geo-electric layers were delineated within the study area and these comprise of topsoil, peat or clay and silty sand. The CPT results were used in the calculation of bearing capacity using Bustamante and Gianeselli equation for pile foundations and Meyehorf equation to determine the maximum load the materials can withstand respectively. Conclusion: The shallow subsurface geology was adjudged to be mechanically unstable with low penetration resistance values up to the depth of 11m. The methods conformed and confirmed that shallow foundation was considered unsuitable for the intended engineering structure. Keywords: Meyehorf, Bustamante and Gianeselli, Subsurface, Geology, Unstable, Foundation.

scholarly journals Geoelectrical and Microbial Assessment of the Agbarho Abattoir Effluent on Ground Water Quality in Agbarho Community, Delta State

2020 ◽  
pp. 3739-3748
Author(s):  
V.B. Olaseni ◽  
Y.S. Onifade ◽  
S.A. Adeleye ◽  
V.A. Ogah
Keyword(s):  
Ph Value ◽  
Fine Sand ◽  
Total Coliform ◽  
Vertical Electrical Sounding ◽  
World Health ◽  
Electrode Spacing ◽  
Near Surface ◽  
Low Resistivity ◽  
Lateral Distance ◽  
Electrical Sounding

The effluence of Agbarho abattoir wastes and animals’ dung on near surface groundwater quality was geoelectrically investigated using 2-Dimensional Electrical Resistivity by engaging Wenner array configuration using PASI-16GL Terrameter. Four traverses of lateral distance of 50m with 2.5m electrode spacing were gotten from the study area and the acquired data was processed and inverted using RES2DINV software so as to delineate the trend of migration of contaminants. Borehole-water samples were collected within the study area for both physiochemical and microbiological analyzes while the depth of aquifer (groundwater) was determined by employing Vertical Electrical Sounding (VES). The 2-Dimensional Inversion model for traverse 1 and 2 revealed a low resistivity value of 0.445Ωm and 2.53Ωm respectively and this occurred at the top soil. Also, the low resistivity value of 0.319Ωm in traverse 3 was indicated in the second layer at the lateral distance between 15m to 35m and at the depth of 6.22m. The model in traverse 4 revealed low resistivity value of 0.374Ωm from the top layer down to the fourth layer at the depth of 9.8m. These low resistivity values indicate high conductivity of bacterial and algae of the animal waste and this can be attributed to the presence of suspected contaminants plume of the abattoir. The depth of aquifer revealed by Vertical Electrical Sounding was 8.9m which is in third layer and the lithology was found to be as fine sand. All physiochemical results including pH value which is 5.1 (acidic in nature) fell below the permissible limit of World Health Organization (WHO). The microbial result showed the total coliform count value as 70 cfu/ml which is not in-line with WHO standard. In conclusion, the study showed that the contaminant exists and pose threat to groundwater in the study area.

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