Geoelectric sounding for the determination of aquifer characteristics in parts of the Umuahia area of Nigeria

Geophysics ◽  
1991 ◽  
Vol 56 (2) ◽  
pp. 284-291 ◽  
Author(s):  
P. D. C. Mbonu ◽  
J. O. Ebeniro ◽  
C. O. Ofoegbu ◽  
A. S. Ekine
Keyword(s):  
Hydraulic Conductivity ◽  
Test Data ◽  
Pumping Test ◽  
Model Parameters ◽  
Current Electrode ◽  
Entire Area ◽  
Maximum Current ◽  
Electrical Soundings ◽  
Aquifer Characteristics

Seventeen Schlumberger vertical electrical soundings (VES) were carried out in parts of the Umuahia area of Nigeria, using a maximum current electrode separation of 1 km. The data were interpreted using a conventional partial curve‐matching method to obtain initial model parameters, which were used in a computer program to obtain final parameters. Three soundings were made at existing boreholes for comparison. Aquifer parameters of hydraulic conductivity and transmissivity were obtained by analyzing pumping test data from existing boreholes. The results of the interpretation revealed three distinct geoelectric layers overlying a conductive geoelectric basement. Based on the model obtained, aquifer hydraulic conductivity and transmissivity were calculated. The hydraulic conductivity calculated agreed closely with that determined from pumping test data. The results of the present study also indicate that the entire area is divided into two zones, each of which is homogeneous in hydraulic properties and water quality, but distinct from the other zone. A local groundwater divide between the Imo and Kwa‐Ibo drainage systems was also defined.

scholarly journals Estimation of Aquifer Characteristics in Parts of Oru Lga of Imo State Nigeria Using Resistivity Data

2019 ◽  
Vol 4 (2) ◽  
pp. 70-84
Author(s):  
I.I.C. Agbodike
Keyword(s):  
Southeastern Nigeria ◽  
Current Electrode ◽  
Imo State ◽  
Transverse Resistance ◽  
Depth To Water Table ◽  
Maximum Current ◽  
Electrical Soundings ◽  
Aquifer Characteristics ◽  
Using Data ◽  
Made In

This paper estimates aquifer characteristics in parts of Oru Area Imo State of Southeastern Nigeria using data from surface electrical soundings. Eighteen vertical electrical soundings were made in the study Area using a maximum current electrode separation of 1.0km.The Abem terrameter SAS 3000B was used in acquiring data. The Schlumberger electrode configuration was adopted in the survey. The result obtained show that the depth to water table varied from 27m to about 205m. Aquifer thickness varied from 24m to about 140m.The aquiferous zones have resistivity range of between 182Wm to about 3934Wm. Aquifer conductivity varied from 0.000254Siemens at Nempi to 0.01036Siemens at Akuma .Transverse resistance varied from 249809Wm2 at Nempi to 3956.5Wm2 at Akuma. Longitudinal conductance varied from 0.01614mho at Nempi to 0.55656mho at Umuoji

scholarly journals INVESTIGATION OF GROUNDWATER POTENTIALS IN IMAKUN OMI COMMUNITY USING ELECTRICAL RESISTIVITY METHOD

2020 ◽  
Vol 7 ◽  
pp. 19
Author(s):  
Joseph Olakunle Coker ◽  
Akindamola Julius Agbelemoge ◽  
Stephen Oluwafemi Ariyo ◽  
Victor Makinde ◽  
Aderemi Amidu Alabi ◽  
...  
Keyword(s):  
Electrical Resistivity ◽  
Groundwater Potential ◽  
High Yield ◽  
Current Electrode ◽  
Ogun State ◽  
Resistivity Method ◽  
The Earth ◽  
Maximum Current ◽  
Electrical Soundings ◽  
Electrical Resistivity Method

Groundwater is described as the water found beneath the surface of the earth in underground streams and aquifers and has become popular as a source of drinking potable water in Nigeria due to its quality when compared to other water sources. The Electrical resistivity method was employed in Imakun Omi Community, a coastal town in Ogun Waterside Local government area of  Ogun State with the aim of determining the groundwater potential of the area. A total of twenty (20) Vertical Electrical Soundings (VES) points were carried out in the area using the Schlumberger configuration with maximum current electrode separation (AB) of 300m using the ABEM SAS 1000 Terrameter. The results obtained were interpreted quantitatively and qualitatively using partial curve matching and computer iteration programs WINRESIST and SURFER 11 for the interpretation from which the reflection coefficient was computed. The groundwater potential of the rock units were evaluated and  40% of the stations show  high yield, 50% of the stations show medium yield and 10% of the stations was observed to have low yield. The aquifer thicknesses are very thick with values ranging from 6.9 m to 79.3 m, hence an average of 43.1mand overburden thicknesses ranging from 9.7m to 96.5 m, with an average of 53.1m

Determination of Hydrogeological Parameters of Aquifer Using the Air Compressor Pumping

2013 ◽  
Vol 448-453 ◽  
pp. 3989-3992
Author(s):  
Xue Jiang ◽  
Xiu Juan Liang ◽  
Chang Lai Xiao ◽  
Chuan Du ◽  
Zhong Kai Wang
Keyword(s):  
Hydraulic Conductivity ◽  
Water Level ◽  
Oil Shale ◽  
Pumping Test ◽  
Comprehensive Analysis ◽  
Graphic Method ◽  
Air Compressor ◽  
Hydrogeological Parameters

When the buried depth of water level is very large, the air compressor is used in pumping test. In the limited conditions, the value of the water level was not measured, but the recovery value of water level could be measured. In this case, the sp value of the water level drawdown was not able to be measured accurately when the pumping test stopped. So the hydraulic conductivity of aquifer could only be determined according to the linear graphic method of the water level recovery test. However, water level recovery characteristics of each period were not the same, and the raising rate of water level were not equal. Thus, there was a deviation when the hydraulic conductivity was solved with the linear graphic method. According to the existing data, the thesis combined the water level recovery fitting of the entire curve fitting with Dupuit formula of artesian well, determining the sp value and hydrogeological parameters of aquifer. After comprehensive analysis, the parameters obtained are more reasonable, which can provide a good reference for in-situ mining of oil shale in this area.

scholarly journals Hydraulic Characteristics of Tuff (Scoria) used as a Container Medium

1992 ◽  
Vol 117 (3) ◽  
pp. 415-421 ◽  
Author(s):  
R. Wallach ◽  
F.F. da Silva ◽  
Y. Chen
Keyword(s):  
Hydraulic Conductivity ◽  
Natural Material ◽  
Model Parameters ◽  
Retention Data ◽  
Reliable Prediction ◽  
Unsaturated Hydraulic Conductivity ◽  
Different Types ◽  
The Media ◽  
Conductivity Curve

For effective management of irrigation and fertilization, a complete understanding of the hydraulic properties of container media is essential. This study was conducted to test the applicability of an existing predictive model for calculating the unsaturated hydraulic conductivity K(h) of tuff (Scoria, granulated volcanic ash). Two texturally different types of tuff as well as five fractions (0-1, 1-2, 2-4, 4-8, and > 8 mm), obtained from the natural material by sieving, were investigated. A 0- to 1-mm fraction of quartz sand was also tested and compared to the corresponding fraction of tuff. Water retention curves 0(h) (main drying and primary wetting scanning curves) of the media were measured over a 0- to 120-cm suction range, which covers the range of horticultural interest. The saturated hydraulic conductivity K was measured after the determination of the range of validity of Darcy's law. The model parameters were determined by curve-fitting of the measured retention data, and the K(h) relationship was obtained by multiplying the calculated relative hydraulic conductivity curve K,(h). The model prediction of K(h) was validated following direct and indirect approaches. The results showed that a reliable prediction of the unsaturated hydraulic conductivity of coarsely textured container media consisting of tuff is possible using a model commonly used for regular soils.

scholarly journals Using Geoelectric Soundings for Estimation of Hydraulic Characteristics of Aquifers in the Coastal Area of Lagos, Southwestern Nigeria

2014 ◽  
Vol 11 ◽  
pp. 30-39 ◽  
Author(s):  
J.O. Fatoba ◽  
S.D. Omolayo ◽  
E.O. Adigun
Keyword(s):  
Hydraulic Conductivity ◽  
Saline Water ◽  
Pumping Test ◽  
Shallow Aquifer ◽  
High Porosity ◽  
Hydraulic Characteristics ◽  
Southwestern Nigeria ◽  
Geoelectric Section ◽  
Current Electrode ◽  
Transverse Resistance

Electrical resistivity investigation was carried out at Ibeju Lekki, Southwestern Nigeria. The thrust of this study is to determine the geoelectrical parameters of the shallow aquifer and estimate the hydraulic characteristics of this aquifer unit from the surface geophysics. The area falls within the Dahomey basin of the Nigeria sedimentary terrain. Twenty-one VES were conducted using Shlumberger array with a maximum half current electrode (AB/2) of 100 m giving total spread of 200 m. Data were interpreted using partial curve matching technique and assisted 1-D forward modeling with WINRESIST software. The qualitative interpretation revealed KQ curves (ρ1 < ρ2 > ρ3 > ρ4) and KH curve (ρ1 < ρ2 > ρ3 < ρ4). The geoelectric section generated from the results of the VES revealed a four geo-electric layers; these include topsoil with resistivity ranging from 213-5404 Ωm, dry sand with resistivity values vary from 301to 17178 Ωm, saturated sand with resistivity varying from 110 to1724 Ωm and sand (saline water content) with resistivity values of between 8 and 97 Ωm. The major aquifer in the area occurs at the third geoelectric layer. The depth to this aquifer is of between 0.7m and 6.0m and the layer thickness is between 0.2 m and 19.9 m. The hydraulic characteristics of the aquifer estimated from the geoelectric parameters reveal that the aquifer has porosity values of between 29.4 % and 57.7 %, protective capacities of between 0.00013 and 0.015 mhos, transverse resistance ranges from 345-18502 Ωm2, transmissivity values vary from 13 to 310 m2/day and hydraulic conductivity ranges from 0.8-65 m/day. The results show that the aquifer is characterized by high porosity and low protective capacities of overburden layers indicating that it is highly vulnerable to surface contamination. It has high transverse resistance, high transmissivity, and high hydraulic conductivity indicating that the aquifer can transmit water at higher rate and sustain the need of the community. This study has demonstrated the efficacy of surface geophysics in estimating hydraulic characteristics of an aquifer where pumping test data are not available and also to determine its vulnerability to surface contaminants.

The estimation of hydraulic conductivity structure by means of SP inversion to dipole pumping test data

2013 ◽  
Author(s):  
Yusuke Ozaki ◽  
John H. Bradford ◽  
Hitoshi Mikada ◽  
Tada-nori Goto ◽  
Junichi Takekawa
Keyword(s):  
Hydraulic Conductivity ◽  
Test Data ◽  
Pumping Test ◽  
Conductivity Structure
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