Publication Title Geoelectric and Geochemical Assessment of SubSoil Corrosivity and Competence for Civil Infrastructures at Utue-Ogume, Delta State, Nigeria Download PDF
Publication Type journal
Publisher Research Square
Paper Link https://orcid.org/0000-0002-8858-7082
Publication Authors Collins Ogorm Molua University of Delta, Agbor, Delta State, Nigeria Chuks Okobia University of Delta, Agbor, Delta State, Nigeria Dandy Dumbiri Nmorsi University of Delta, Agbor, Delta State, Nigeria Nkonyeasua Abanjo University of Delta, Agbor, Delta State, Nigeria Monday Edobor University of Delta, Agbor, Delta State, Nigeria Chinyere Ngozika Eze
Year Published 2024-05-05
Abstract The corrosive nature of sub-soil to aggressive attack on buried metallic pipes and concrete, and its competence to withstand overburden stress from civil engineering infrastructures at Otue-Ogume, an oil producing community in Delta State was here assessed with geo-electric and geochemical methods. Nine Vertical Electrical Sounding (VES) was carried out with Mini-Res Resistivity Meter using the Schlumberger array. Soil samples were also collected with hand auger at varying depths of 0-1m, 1-2m and 2-3m at each of the nine VES stations for geochemical analysis. The VES data was processed with IPI2WIN software and delineated six to eight geo-electric layers of lateritic topsoil, clayey sand, sandy clay, Fine-medium grained sand, medium-coarse grained sand, coarse grained sand, sandy clay and clay. The soil resistivity, thickness and depth ranged respectively from 53.04?m to 4535?m, 0.6m to 79.2m and 0.6m to 134.8m. The geochemical parameters (pH, Cl- , and So4 2-) were lower than the permissible standards, although the Cl- and So42- concentration could be potentially high with time due to seasonal fluctuations which can trigger the corrosion dynamics of the soil. The subsurface soil layers we characterized as essentially non-corrosive, moderately corrosive and mildly corrosive to concrete and metallic pipes. The subsurface soils were also characterized as highly competent, competent and moderately competent confirming that it can withstand erecting of massive buildings or civil engineeri infrastructures to depth of 2m. Treatment of the moderately and mildly corrosive sub-soil layers is strongly advised before crude oil and gas transmission pipes is buried to that depth.
Publication Title Assessment of Groundwater Potential and Vulnerability Using Electrical Resistivity Method in the University of Delta, South-South Nigeria Download PDF
Publication Type journal
Publisher Journal of Computing, Science &Technology
Publication Authors Irunkwor Thompson Chinedum1 , Abanjo Nkonyeasua2 , Okobia Chuks3 , Maduaka Pascal Ifeanyi4
Year Published 2024-10-09
Abstract Groundwater potential and the strength of the aquifer overburden protective layer to prevent contaminants into groundwater aquifer within the University of Delta Main Campus were assessed with Vertical Electrical Sounding (VES). Ten sounding points were carried out using Petrozenith PZ-02 Terrameter with the Schlumberger array. The VES data were processed with IPI2WIN software and delineated eight to nine geoelectric layers of lateritic topsoil, clayey sand, sandy clay, fine grained sand, fine to medium grained sand, medium grained sand, medium to coarse grained sand, coarse grained sand and sandy clay/clay. The aquiferous layer located between the sixth and eighth layer exhibited varying resistivity (2037?m to 300098?m), thickness (59.93m to 88.92m) and depth (106.75m to 140.80m). Dar-zarrouk hydraulic parameters were derived from values of aquifer resistivity and thickness. Hydraulic conductivity ranged from 6.90m/day to 9.70m/day, transmissivity from 413.65m2 /day to 850.11m2 /day, longitudinal conductance from 0.0002892 mho to 0.040411 mho and transverse resistance from 122,118.15?m2 to 263, 000588.72?m2 .The aquifer storativity ranged from 0.0001798m-1 to 0.0002668m-1 . Aquifer overburden protective layer was rated poor and highly vulnerable to contaminants. However, aquifer showed high potential of portable water sufficient to meet the needs of the University community. Hydrogeochemical study is recommended to determine the water portability.