Delineation of saltwater intrusion into the freshwater aquifer of Lekki Peninsula, Lagos, Nigeria

Adepelumi, A. A.; Ako, Bankole D.; Ajayi, T. R.; Afolabi, Olajide Joseph; Omotoso, E. J.

doi:10.1007/s00254-008-1194-3

Cited by 138 publications

(94 citation statements)

References 11 publications

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“…Sherif et al (2006) integrated geoelectrical method with hydro-geochemical method to delineate saltwater intrusion at Wadi Ham, UAE. In Lagos, Nigeria, Adepelumi et al (2009) used vertical-electrical-sounding survey to delineate Lekki Peninsula freshwater-aquifer saltwater intrusion.…”

Section: Introductionmentioning

confidence: 99%

Time-lapse resistivity investigation of salinity changes at an ex-promontory land: a case study of Carey Island, Selangor, Malaysia

Baharuddin

Taib

Hashim

et al. 2010

Environ Monit Assess

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Time-lapse resistivity measurements and groundwater geochemistry were used to study salinity effect on groundwater aquifer at the ex-promontory-land of Carey Island in Malaysia. Resistivity was measured by ABEM Terrameter SAS4000 and ES10-64 electrode selector. Relationship between earth resistivity and total dissolved solids (TDS) was derived, and with resistivity images, used to identify water types: fresh (ρ e > 6.5 m), brackish (3 m < ρ e < 6.5 m), or saline (ρ e < 3 m). Long-term monitoring of the studied area's groundwater quality via measurements of its time-lapse resistivity showed salinity changes in the island's groundwater aquifers not conforming to seawater-freshwater hydraulic gradient. In some aquifers far from the coast, saline water was dominant, while in some others, freshwater 30 m thick showed groundwater potential. Land transformation is believed to have changed the island's hydrogeology, which receives saltwater pressure all the time, limiting freshwater recharge to the groundwater system. The time-lapse resistivity measurements showed active salinity changes at resistivity-image bottom moving up the image for two seasons' (wet and dry) conditions. The salinity changes are believed to have been caused by incremental tide passing through highly porous material in the active-salinity-change area. The study's results were used to plan a strategy for sustainable groundwater exploration of the island.

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Section: Introductionmentioning

confidence: 99%

Time-lapse resistivity investigation of salinity changes at an ex-promontory land: a case study of Carey Island, Selangor, Malaysia

Baharuddin

Taib

Hashim

et al. 2010

Environ Monit Assess

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“…This is mostly exploited through hand-dug wells and stand the risk of pollution because of its nearness to the surface and being a water table aquifer (depth of 2.0-15.0 m below the surface) according to Longe et al (1987) and Adepelumi Ako, Ajayi, Afolabi, and Omotoso (2008). This being the case, the hydrocarbon contamination at the study area falls within the first aquifer.…”

Section: Hydrogeologymentioning

confidence: 99%

Application of Electrical Resistivity Tomography in Mapping Subsurface Hydrocarbon Contamination

Ayolabi¹,

Folorunso²,

Idem³

2012

ESR

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The subsurface soil around Baruwa community was reportedly contaminated by hydrocarbon not because the area falls within oil-producing community but it suffers from inceasant leakage from petroleum pipeline that supply petroleum products to hydrocarbon terminar located within the area. Thus, to ascretain the extent of contamination of the subsurface soil around the area, an integrated geophysical methods involving vertical electrical sounding (VES) and electrical resistivity tomography (ERT) supported with induced polarization (IP) and spontaneous potential (SP) methods were carried out. The hydrocarbon contaminated layers were marked out beneath each VES point by high resistivity ranging between 943Ωm and 4749Ωm at a depth of 1 to 35.44m below the surface. Similarly, ERT result shows that the subsurface soil around the investigated area has been contaminated at a shallow depth of about 2m downward with resistivity value above 1000Ωm. IP and SP data were Integrated to identify the sandy contaminated layers from clayey layer. IP value of 0 to 10mV/V and SP values of <+10mV were obtained over the sandy formation. The work shows that hydrocarbon leaking from the pipeline laid a few meters beneath the earth surface actually flow both upwardly (possibly due to seasonal variation in the water table which is usually close to the surface during rainy season) to the surface and downwardly at greater depth into the subsurface, through a porous medium -sandy layer. This may probably accounts for the reason while most of the handdug wells in the area are reportedly contaminated with hydrocarbon products.

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“…It has been found suitable for determining freshwater bearing formation [1,2,3,4,5,6]. The geoelectric method has also proved successful in the mapping of saltwater interfaces in many different hydrogeologic settings [7,8]. This study was undertaken with the aim of delineating the subsurface geoelectric sequence and determining the layer geoelectric parameters, evolve a general geologic sequence of the area and determine the aquifer units beneath the surface and their depth of occurrence.…”

Section: Introductionmentioning

confidence: 99%

Geoelectric Investigation Of Deghele Community In Warri South West L.G.A, Delta State, Nigeria

Atakpo¹

2013

IOSR-JAP

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Delineation of saltwater intrusion into the freshwater aquifer of Lekki Peninsula, Lagos, Nigeria

Cited by 138 publications

References 11 publications

Time-lapse resistivity investigation of salinity changes at an ex-promontory land: a case study of Carey Island, Selangor, Malaysia

Time-lapse resistivity investigation of salinity changes at an ex-promontory land: a case study of Carey Island, Selangor, Malaysia

Application of Electrical Resistivity Tomography in Mapping Subsurface Hydrocarbon Contamination

Geoelectric Investigation Of Deghele Community In Warri South West L.G.A, Delta State, Nigeria

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