Use of geophysical logs in hydrogeological studies and borehole designs: case study of Apapa coastal area, Lagos, Nigeria

Jimoh, R. A.; Bankole, Olabode M.; Ahmed, Khalid S.; Christopher, O. A.; Adeniji, M. A.; Ebhodaghe, J.; Sedara, Samuel O.; Obende, P. W.; Alebu, O.; Ezima, E. A.

doi:10.1007/s13201-018-0804-9

Cited by 8 publications

(1 citation statement)

References 11 publications

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“…That is another reason why delineation of the freshwater aquifer boundary in coastal areas is of particular importance is to establish a baseline. Extreme climatic events, sea-level fluctuations, and increased groundwater abstraction from coastal aquifers disrupt the natural groundwater equilibrium condition, resulting in shifting of the freshwater/saltwater interface inland, toward the abstraction well, and seawater upconing and/or moving locally upward [10][11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Geophysical Delineation of Freshwater–Saline Water Interfaces in Coastal Area of Southwest Bangladesh

Sarker¹,

Camp²,

Hermans³

et al. 2021

Water

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Insufficiency of potable water is acute in southwest (SW) coastal areas of Bangladesh. The local population ignores the depth to saltwater/freshwater interface causing many unsuccessful waters wells drilling. In this context, a combined use of borehole logs, geophysical well logs, vertical electrical soundings (VES), electrical resistivity tomography (ERT) and electrical conductivity (EC) of sampled waters was performed to identify saltwater/freshwater interface depths in this coastal part. The study shows that the depth to freshwater/saltwater interface varies from place to place occurring commonly between 190 to 285 m, and locally as shallow as 146 m. The shallow freshwater/saltwater interface depth is greatly influenced by the upconing of fresh water from the deep aquifer (DA) near the major rivers and coast compared to the landward part and is mixed with more saline waters above. Vertically infiltrated saltwater is the main cause of brackish water in the upper shallow aquifer (USA), which is hydraulically connected with the lower shallow aquifer (LSA), and not directly recharged from the Bay of Bengal in the south. The study will contribute to find out the depth of the potential freshwater aquifer and assess the aquifer vulnerability in the coastal area of SW Bangladesh.

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Section: Introductionmentioning

confidence: 99%

Geophysical Delineation of Freshwater–Saline Water Interfaces in Coastal Area of Southwest Bangladesh

Sarker¹,

Camp²,

Hermans³

et al. 2021

Water

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Water scarcity in the fast‐growing megacity of Lagos, Nigeria and opportunities for managed aquifer recharge

Olabode,

Comte

2024

WIREs Water

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In the last three decades, the world has experienced a rapid emergence of megacities. The increasing demographics, urbanization, and water demand brought severe and undesired effects on the quantity and quality of their water resources. A prime example is Lagos (Nigeria, West Africa), which is projected to become the world's largest city by 2100, and faces water scarcity challenges common to other megacities of developing countries. A literature review reveals the vast gap between water demand and regulated supply, inadequate knowledge and information on the current state of water (re)sources, and major, yet unregulated, use of groundwater. It further highlights the impacts of uncontrolled wastewater discharge into surface waters and aquifers, the role of increasing paved surfaces and blocked drainages on flooding, the inadequate supply of potable water, and the unsustainable abstraction of groundwater. Here, we examine the potential of managed aquifer recharge (MAR) to address these recurrent challenges across the megacity. The analysis reveals the opportunities and potential risks associated with the capture of wastewater, storm water, and brackish surface water for MAR. These waters, after appropriate treatment and subsurface storage may bridge the growing water supply–demand gap and mitigate the effects of groundwater (over)exploitation, including aquifer depletion, saltwater intrusion and land subsidence. Immediate efforts should focus on improving the conceptual and quantitative knowledge of Lagos' hydrogeology and groundwater resources through comprehensive spatial–temporal groundwater monitoring and socio‐economic studies of groundwater access and use. The insights provided may inform other fast‐growing coastal megacities in Africa and the wider developing world.This article is categorized under: Science of Water > Water and Environmental Change Engineering Water > Water, Health, and Sanitation Human Water > Value of Water Science of Water > Hydrological Processes

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Assessment of saltwater–freshwater interactions using water samples and borehole logging information in the Lagos coastal region, Nigeria

et al. 2021

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Use of geophysical logs in hydrogeological studies and borehole designs: case study of Apapa coastal area, Lagos, Nigeria

Cited by 8 publications

References 11 publications

Geophysical Delineation of Freshwater–Saline Water Interfaces in Coastal Area of Southwest Bangladesh

Geophysical Delineation of Freshwater–Saline Water Interfaces in Coastal Area of Southwest Bangladesh

Water scarcity in the fast‐growing megacity of Lagos, Nigeria and opportunities for managed aquifer recharge

Assessment of saltwater–freshwater interactions using water samples and borehole logging information in the Lagos coastal region, Nigeria

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