Geo-electrical modeling of leachate contamination at a major waste disposal site in south-eastern Nigeria

Udosen, Ndifreke I.

doi:10.1007/s40808-021-01120-9

Cited by 19 publications

(6 citation statements)

References 36 publications

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“…This was attainable by expunging points considered as outliers and determining the average of the ρs values obtained at the crossover points with the dominant trend maintained (George et al, 2017(George et al, , 2022aEkanem et al, 2020Ekanem et al, , 2022a. The curve smoothening was essential to reduce the root mean square errors (RMSE) in the later stage of computer assisted interpretation, which was accomplished in this research by using the WINRESIST computer software (Evans et al, 2015, Ekanem 2021, 2022aUdosen et al, 2023Udosen et al, , 2024c. The smoothened VES curves were supplied as inputs to the software, which uses the least-squares inversion technique to compute a theoretical resistivity model (Vander Velpen and Sporry 1993).…”

Section: Methodsmentioning

confidence: 99%

Volumetric estimation of groundwater reserve in Akwa Ibom State University main campus, southern Nigeria using surficial resistivity measurements

Ekanem

2024

Preprint

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Recent changes in climatic conditions and the resulting changes in demands for potable water call for a thorough understanding of groundwater resources. In this research, the usability of the electrical resistivity technique in the volumetric estimation of groundwater reserve is demonstrated. Sixteen (16) vertical electrical soundings were made at predetermined locations in Akwa Ibom State University campus, southern Nigeria with the main aim of delineating the hydrostratigraphic units and estimating the groundwater reserve in the area. Three to four geoelectric layers comprising poorly sorted continental sands with minor clay intercalations have been identified in the study site. Groundwater extraction in the area takes place in the second and third layers, based on location, at depths ranging from 0.7 to 84.7 m. The aquifer system is shown to have a mean effective porosity of 0.32, mean specific yield of 0.23 and mean specific retention of 0.09. The total aquifer volume is estimated to be 1.65 x 108 m3 while the effective water volume reserve in the area is 5.3 x 107 m3. The usable groundwater volume releasable by the aquifer during pumping is shown to be 71.9 % of the effective volumetric groundwater reserve while the fractional volume retainable by the aquifer is 28.1 %. This, by implication is an indication that the area has good groundwater potential for sustainability of water wells. The regression equations derived in this study can be used for easy and rapid prediction of aquifer porosity and specific yield/retention from surface resistivity data in regions with similar geological characteristics. These outcomes are very auspicious, particularly in devising sustainable groundwater development and exploitable schemes to meet current and future needs of the university community.

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Section: Methodsmentioning

confidence: 99%

Volumetric estimation of groundwater reserve in Akwa Ibom State University main campus, southern Nigeria using surficial resistivity measurements

Ekanem

2024

Preprint

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“…The electrical resistivity data of the areas covered by profiles 3 and 5 were characterized by high resistivities, and associated with low contaminant infiltration capacity [13], given high surface compaction [63]. The area transacted by profile 3 is located far from the waste dump (>350 m), revealing that contaminants may not be reaching this area.…”

Section: Data Integrationmentioning

confidence: 99%

Integration of Electrical Resistivity and Modified DRASTIC Model to Assess Groundwater Vulnerability in the Surrounding Area of Hulene-B Waste Dump, Maputo, Mozambique

Bernardo

Candeias

Rocha

2022

Water

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In this study, electrical resistivity was applied in six 400 m profiles around the Hulene-B waste dump (Mozambique). Afterwards, an inversion was performed by RES2Dinv. The use of the electrical resistivity method allowed us to characterize in detail some underlying aspects of the DRASTIC index by identifying anomalous zones considered to be permeable and prone to leachate migration. The modified DRASTIC index revealed high values in areas near contaminated surface groundwater and surface layers of the vadose zone, characterized by low resistivities. Areas with lower index results were characterized by high resistivity on surface layers and high depth at which groundwater was detected. The overall modified DRASTIC index result revealed medium vulnerability. However, high vulnerability index values were detected in areas with higher surface elevation, suggesting groundwater contamination by horizontal dilution of leachates from the surrounding area of the Hulene-B waste dump.

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“…In recent years with the awareness of the increasingly complex environmental issues, geophysical prospection methods started to be successfully used in the study of complex environments, such as urban areas [45,46]. Among the geophysical methods most employed in environmental studies the electrical resistivity has been pointed out as relevant [21,22], and it has been prominent in the study of environmental problems in soil and groundwater, mainly in the location of buried hazardous waste, contamination from different sources and the planning of safe sites for the deposit of industrial and domestic waste [26,28] being widely used to identify areas of heavy metal contamination, contamination plumes [10], groundwater [22,47], lithological variations [26].…”

Section: Geophysical Studies (Electrical Resistivity)mentioning

confidence: 99%

“…After the readings, the data was transferred to the resistivimeter, which then takes the readings, 3 minimum and 6 maximums, to obtain the smallest error average between readings. The inversion of the electrical resistivity data obtained in the 10 lines was done based on the standards defined in the software RES2DINV3.59.106, namely: application of the smoothness constraint method in the resistivity values of the final model, calculation of the Jacobian matrix in each iteration, standard Gauss-Newton optimization method [21,46,50]. The interpretation of the profiles was based on the direction of each profile and the length of the profiles (400m).…”

Section: Geophysical Studies (Electrical Resistivity)mentioning

confidence: 99%

Characterisation of the Dynamics of Leachate Contamination Plumes in the Surrounding of the Hulene - B Waste Dump, Maputo, Mozambique

Bernardo¹,

Candeias²,

Rocha³

2021

Preprint

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The contamination of areas around solid urban waste dumps is a global challenge for the maintenance of environmental quality in large urban centres in developing countries. This study applied geophysical methods (electrical resistivity) to identify leachate contamina-tion plumes in the subsoil and groundwater, as well as to describe their temporal (2020 and 2021) dynamics in the lithology and groundwater around the Hulene - B waste dump, Maputo, Mozambique. Geophysical methods (electrical resistivity) were applied to identify possible groundwater contamination plumes, their dynamics, mechanisms of their enrichment and dispersion. Eight 400 m electrical resistivity profiles were performed, four profiles in January 2020 and four profiles in May 2021, overlapped, and the data were inverted with RES2D software. The electrical resistivity models indicate an E - W move-ment of large contamination plumes that dilute superficially into the natural surface wa-ter receiving basin and groundwater, creating zones of resistive anomalies. The thickness of the plumes in the subsurface environment was shown to be extensive in summer for profiles 1a and 2b and we associate it with the higher leachate production and migration mechanisms, which are intense in the hot and rainy season. Profile 4b showed the prop-agation of anomalous surface and subsurface areas, which was associated with higher leachate production and migration process in the new deposition zone (west). The spatial distribution of contamination plumes at both stations reduced significantly as we moved further away from the waste deposit, revealing the attenuating effect of groundwater and lithological substrate (Profile 3 a, b, and fig.7).

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Geo-electrical modeling of leachate contamination at a major waste disposal site in south-eastern Nigeria

Cited by 19 publications

References 36 publications

Volumetric estimation of groundwater reserve in Akwa Ibom State University main campus, southern Nigeria using surficial resistivity measurements

Volumetric estimation of groundwater reserve in Akwa Ibom State University main campus, southern Nigeria using surficial resistivity measurements

Integration of Electrical Resistivity and Modified DRASTIC Model to Assess Groundwater Vulnerability in the Surrounding Area of Hulene-B Waste Dump, Maputo, Mozambique

Characterisation of the Dynamics of Leachate Contamination Plumes in the Surrounding of the Hulene - B Waste Dump, Maputo, Mozambique

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