Geophysical and hydrogeological evaluation of rising groundwater level in the coastal areas of Lagos, Nigeria

Oyedele, K. F.; Ayolabi, Elijah A.; Adeoti, Lukumon; Adegbola, R. B.

doi:10.1007/s10064-008-0182-x

Cited by 22 publications

(10 citation statements)

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“…The need for sustainable management of solid waste which was emphasized in section 3 of this paper was recommended by Folorunsho and Awosika (2001). Komolafe et al (2014) argued for the adoption of proactive measures to risk management and adaptation whilst constant geophysical and hydrological evaluation of rising groundwater levels was emphasized by Oyedele et al (2009). Adelekan (2013) reiterated the UNISDR recommendation which calls for the participation of the private sector in risk management through investment decision making in building and construction.…”

Section: Recent Research Effortsmentioning

confidence: 99%

Review article: A review and critical analysis of the efforts towards urban flood risk management in the Lagos region of Nigeria

Nkwunonwo

Whitworth

Baily

2016

Nat. Hazards Earth Syst. Sci.

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Abstract. Urban flooding has been and will continue to be a significant problem for many cities across the developed and developing world. Crucial to the amelioration of the effects of these floods is the need to formulate a sound flood management policy, which is driven by knowledge of the frequency and magnitude of impacts of these floods. Within the area of flood research, attempts are being made to gain a better understanding of the causes, impacts, and pattern of urban flooding. According to the United Nations office for disaster reduction (UNISDR), flood risk is conceptualized on the basis of three integral components which are frequently adopted during flood damage estimation. These components are: probability of flood hazard, the level of exposure, and vulnerabilities of elements at risk. Reducing the severity of each of these components is the objective of flood risk management under the UNISDR guideline and idea of "living with floods". On the basis of this framework, the present research reviews flood risk within the Lagos area of Nigeria over the period 1968-2012. During this period, floods have caused harm to millions of people physically, emotionally, and economically. Arguably over this period the efforts of stakeholders to address the challenges appear to have been limited by, amongst other things, a lack of reliable data, a lack of awareness amongst the population affected, and a lack of knowledge of flood risk mitigation. It is the aim of this research to assess the current understanding of flood risk and management in Lagos and to offer recommendations towards future guidance.

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Section: Recent Research Effortsmentioning

confidence: 99%

Review article: A review and critical analysis of the efforts towards urban flood risk management in the Lagos region of Nigeria

Nkwunonwo

Whitworth

Baily

2016

Nat. Hazards Earth Syst. Sci.

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“…Una de las implicaciones que tiene la duración de la inundación es económica, en la evaluación de daños que incrementan el costo por pérdidas 3.6 veces más en zonas urbanas, respecto a las inundaciones superficiales (Green, 2003;Green et al, 2006). El ascenso de nivel freático de 0.5 m, en un acuífero de materiales granulares, puede afectar el diseño geotécnico de las construcciones subterráneas en ciudades que se localizan cerca de la costa (Oyedele et al, 2009). En el acuífero granular de Oxford, con niveles freáticos de 1 -2 m de profundidad, la inundación por agua subterránea es un indicador de que una inundación más extensa puede ocurrir (Macdonald et al, 2007), es decir, la extensión de una inundación superficial depende en gran medida de los niveles antecedentes de agua subterránea (Cobby et al, 2009).…”

Section: Discussionunclassified

Inundaciones por agua subterránea en zonas costeras. Caso de estudio: acuífero de Veracruz

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et al. 2014

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Inundaciones por agua subterránea en zonas costeras 247 ResumenEl manejo del riesgo en inundaciones debe ser entendido como parte integral de las interacciones del ciclo hidrológico, en donde el ascenso de niveles freáticos puede generar zonas inundables por agua subterránea. La metodología empleada para identificar este fenómeno fue el monitoreo mensual de mediciones de profundidad del nivel freático durante el año 2012, mediante una red de monitoreo de 27 norias, nueve piezómetros y el registro de precipitación diaria en una planicie de inundación de la zona costera de Veracruz. Los resultados muestran que existe una variación temporal del nivel freático e indican que la temporada de menor nivel tiene lugar en mayo, y que ocurren ascensos de hasta 2 -3 m en septiembre. En la zona de estudio, el ascenso de niveles freáticos evidenció tres casos de inundaciones por agua subterránea que tuvieron períodos de inundación hasta por cuatro meses. Este trabajo pone en evidencia la presencia de zonas inundables por agua subterránea, la cual debe ser tomada en cuenta para la gestión del riesgo por inundaciones en áreas con niveles freáticos someros de zonas costeras.Palabras clave: inundaciones, agua subterránea, nivel freático, zona costera, Veracruz. Abstract Flood risk management must be understood as an integral part of the hydrological cycle, where the rise of groundwater levels can

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“…Several hydrogeology methods have been employed in groundwater aquifer characterisation, which range from invasive geophysical methods, such as electrical resistivity and electromagnetic method, and direct methods, such as borehole logging and hydrochemical evaluation [3,[14][15][16][17]. Borehole well logging is known for the precise qualitative and quantitative delineation of groundwater aquifers, especially in stratified sedimentary basins [18][19][20], the results of which were used here. Geohydraulic information was extracted from previous studies at different locations across this basin.…”

Section: Introductionmentioning

confidence: 99%

Hydrostratigraphy and Hydraulic Characterisation of Shallow Coastal Aquifers, Niger Delta Basin: A Strategy for Groundwater Resource Management

et al. 2019

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The groundwater from shallow coastal aquifers in Nigeria has been reported to be under intense stress resulting from both natural and anthropogenic impacts ranging from saltwater intrusion, effluent-related contamination and pollution to oil spillage, gas flaring, municipal, industries and agriculture. Here we characterised the hydrostratigraphy and hydraulic characteristics of the shallow coastal aquifers of the Niger Delta basin and assessed the resilience of groundwater to both natural and anthropogenic impacts. Fifty-two borehole logs were analysed from which lithological sections were used to generate cross-sections along with four profiles. The system was more complex than previously reported: a unit of silty sand was observed in the western part of the basin that thins out leaving the eastern part of the basin as an unconfined aquifer underlain by multiple thin beds of the sand aquifer. A layered sand aquifer occurs in the northern parts of the basin, which holds freshwater in this area, and is interbedded by clay layers which serve as aquitards. The relatively higher hydraulic conductivity of the Benin Formation units compared to those of the Deltaic Formation leave it with weaker climate change resilience and more vulnerable to pollution and contamination. While groundwater remains the dominant source of fresh water in the northern part of the basin, a strategic approach is needed to access potable water from the southern part where contaminated surface water appears to directly interact with groundwater of the uppermost unconfined aquifer. Management of waste and effluent related to oil spillage, municipal, industries and agricultural in this area should be engineered to protect the groundwater resources of this aquifer.

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Geophysical and hydrogeological evaluation of rising groundwater level in the coastal areas of Lagos, Nigeria

Cited by 22 publications

References 1 publication

Review article: A review and critical analysis of the efforts towards urban flood risk management in the Lagos region of Nigeria

Review article: A review and critical analysis of the efforts towards urban flood risk management in the Lagos region of Nigeria

Inundaciones por agua subterránea en zonas costeras. Caso de estudio: acuífero de Veracruz

Hydrostratigraphy and Hydraulic Characterisation of Shallow Coastal Aquifers, Niger Delta Basin: A Strategy for Groundwater Resource Management

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