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Geoelectrical and seismoelectric mapping of subsurface pollution in a closed landfill near the Tongo Bassa and Ngongue river, Douala Cameroon.

Authors :
Kevin, Zebaze Djuka Mba
Yang, Jidong
Lordon, Anatole Eugene Djieto
Huang, Jianping
Perabi, Clotaire José Pako
Rapheal, Onguene
Dirane, Kengue Ngouene Jocelyn
Ahmed, Mbouemboue Nsangou Moussa
Yadav, Basant
Kovacikova, Svetlana
Source :
Frontiers in Earth Science; 2024, p1-16, 16p
Publication Year :
2024

Abstract

Located in Douala V (Cameroon), Makepé Missoké is a lowland area that is influenced by the Tongo Bassa and Ngongué rivers. The site has a closed dumpsite, that operated from the 1975's to 2003 for the disposal and storage of domestic waste produced in Douala. Geoelectric profiling (ERT) coupled with seismo-electric imaging was used to characterize the shallow aquifer of the Douala subbasin and map subsurface pollution. Fourteen geoelectrical profiles were deployed between June and August 2018 and March 2019. Along these lines, 49 sets of seismo-electric point data were collected in December 2021. A total of 118 wells drilled (2018) were used to obtain water level and topographic data. The aquifer geometry, hydraulic characteristics, permeability, lithology and leachate plume extent were determined. This survey enables us to visualize waste infiltration and migration within Makepé. The drilled wells indicate that the main lithologies observed are clay, sandy clay, sand, clayey sand and gravel. The leachate plume observed after processing the electric profiles had a resistivity signature of < 10 Ωιτι, and high electrical conductivity are observed in some wells. The leachate migrates within the subsurface along a northwest-southwest trend, where ground water pollution is observed due to leachate infiltration. This infiltration resulted in poor water quality indices in some collected samples. Such pollution is common in unconfined aquifers (< 50 m) due to the absence of a confining layer at the landfill. An increase in resistivity values with depth toward the northeast direction indicates progressive vertical dilution during leachate mineralization. This study integrated geoelectric and seismo-electric tomography with basic water chemistry analysis to effectively characterize the groundwater within the phreatic Quaternary/Mio-Pliocene aquifers of the Douala basin. [ABSTRACT FROM AUTHOR]

Details

Language :
English
ISSN :
22966463
Database :
Complementary Index
Journal :
Frontiers in Earth Science
Publication Type :
Academic Journal
Accession number :
179135092
Full Text :
https://doi.org/10.3389/feart.2024.1400283