Shallow urban aquifers under hyper-recharge equatorial conditions and strong anthropogenic constrains. Implications in terms of groundwater resources potential and integrated water resources management strategies

Nlend, Bertil; Celle-Jeanton, Hélène; Huneau, Frédéric; Garel, Émilie; Boum-Nkot, S. Ngo; Étamé, Jacques

doi:10.1016/j.scitotenv.2020.143887

Cited by 16 publications

(6 citation statements)

References 58 publications

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“…Results show that the aquifers are recharged during 6 months, indicating the great quantitative potential of the studied aquifers. Moreover, this information on recharge timing is consistent with that recorded in other humid African regions [56,57].…”

Section: Hydrogeological Synthesis and Sustainability Of Beninese Coa...supporting

confidence: 88%

Insight into Groundwater Resources along the Coast of Benin (West Africa) through Geochemistry and Isotope Hydrology; Recommendations for Improved Management

Odeloui

Nlend²,

Huneau³

et al. 2022

Water

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Along the West-African coast, groundwater is under several threats coming from both human activities and climate change. However, hydrogeological studies have so far been conducted in a piecemeal way, city by city. In this paper, a regional study was conducted along the Beninese coast, combining hydrogeochemistry and water stable isotopes. Monthly rainfall samples were analyzed in terms of chemistry and isotopes as well as groundwater from Holocene (upper aquifer) and Mio-Plio-Pleistocene (lower aquifer). This allowed to determine the recharge timing of aquifers (April to October, excluding August). Rainwater then infiltrates the soil with a slight evaporation. The upper aquifer, more heterogeneous, is displaying many different water types while the lower aquifer shows mainly a Na-Cl water type. While the upper aquifer shows many signs of contamination from human activities and saltwater intrusion from lakes and lagoons, the deeper aquifer is more influenced by a geogenic signature. These results are then interpreted regarding the demographic trends and climate change scenario. In the long-term, the groundwater level of the lower aquifer is expected to decrease as the rate of abstraction increases and recharge rate decreases. It is therefore recommended to develop adapted and urgent protection measures of the water resource to ensure sustainable and healthy groundwater exploitation.

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Section: Hydrogeological Synthesis and Sustainability Of Beninese Coa...supporting

confidence: 88%

Insight into Groundwater Resources along the Coast of Benin (West Africa) through Geochemistry and Isotope Hydrology; Recommendations for Improved Management

Odeloui

Nlend²,

Huneau³

et al. 2022

Water

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“…According to Nlend et al (2021), there is still little knowledge about the functioning of groundwater in humid tropical regions and papers on the hydrogeology of the humid tropics are less frequently reported in the literature; for such regions, the main focus is generally on water quality and the economic and environmental importance of this resource. Fosberg et al (1961) physically identify these regions by: (i) monthly temperature equal to or greater than 20°C during at least eight months of the year; (ii) vapor pressure and relative humidity average of ~20 millibars and 65%, respectively, for at least 6 months of the year; (iii) annual precipitation greater than 1500 mm; (iv) rain falling all year with at least six months with rainfall ≥75 mm/month.…”

Section: Introductionmentioning

confidence: 99%

“…Fosberg et al (1961) physically identify these regions by: (i) monthly temperature equal to or greater than 20°C during at least eight months of the year; (ii) vapor pressure and relative humidity average of ~20 millibars and 65%, respectively, for at least 6 months of the year; (iii) annual precipitation greater than 1500 mm; (iv) rain falling all year with at least six months with rainfall ≥75 mm/month. They represent approximately 22% of the Earth's surface (Nlend et al, 2021) and are home to many developing countries, which have the highest population growth rates, and whose population is expected to represent 50% of humanity by 2050. In this context, there is an urgent need to increase knowledge on aquifers functioning in humid tropical regions and particularly in areas of Latin America representing 45% of the humid tropics (30% in Sub-Saharan Africa and 25% in Asia) (Nlend et al, 2021).…”

Section: Introductionmentioning

confidence: 99%

“…They represent approximately 22% of the Earth's surface (Nlend et al, 2021) and are home to many developing countries, which have the highest population growth rates, and whose population is expected to represent 50% of humanity by 2050. In this context, there is an urgent need to increase knowledge on aquifers functioning in humid tropical regions and particularly in areas of Latin America representing 45% of the humid tropics (30% in Sub-Saharan Africa and 25% in Asia) (Nlend et al, 2021).…”

Section: Introductionmentioning

confidence: 99%

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Uncertainty in groundwater recharge estimation using groundwater level fluctuation and aquifer test

Penner

Martins

Rodrigues

et al. 2023

RBRH

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For sustainable groundwater management the rate of groundwater recharge and specific yield are both of the most important elements in the analysis and management of groundwater resources, and, sometimes, estimation of these parameters remains a challenge. This research presents a combining approach of the water-table fluctuation method (WTF) with an aquifer test to estimate both and quantify their uncertainty. The methodology requires at least three wells: two instrumented observation wells with a level sensor for long-term monitoring and a pump well located nearby for aquifer testing. The test interpretation was supported by the Aqtsolv Demo software obtaining the best fit with the method proposed by Tartakovsky-Neuman, with a specific yield varying, in 2σ, between 9.4% and 10.6%. Recharge was estimated with WTF, and the uncertainty in recharge is obtained by propagating the uncertainties about the specific yield (Bayesian inference) and the groundwater recession dynamics to the WTF. The uncertainty about recharge stems from uncertainty about the specific yield. The approach was applied on the campus of the Federal University of Pará, Belém, Brazil. Recharge was estimated at 1078.9 mm, from 03/sep/2020 to 30/sep/2021, with an associated uncertainty of 129.5 mm in 2σ, which equates to a range between 33.9 and 39.8% in terms of precipitation. Through the use of cost-effective instrumentation and interpretation methodology, replication of that approach can be encouraged to provide reliable estimates of recharge and specific yield in a site specific. Such condition can be useful to reduce the predictive uncertainty of groundwater management.

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“…The ability to evaluate water for drinking, irrigation, and other uses requires a thorough understanding of water hydrogeochemistry. Finally, a variety of factors affect groundwater quality, including rainfall, topographic relief, mineral dissolution, mineral solubility, ion exchange, oxidation, reduction, natural and anthropogenic activities such as geological structure and mineralogy of watersheds and aquifers, residence time, poor sanitary conditions, and the use of fertilizers and pesticides to increase crop yields (Nlend et al, 2021).…”

Section: Introductionmentioning

confidence: 99%

Hydrogeochemical evolution processes and evaluation of groundwater suitability for domestic and agricultural utility in Southern Punjab, Pakistan

Iqbal¹,

Su²

2021

Preprint

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Groundwater is a vital resource for human life and economic growth. In the Khanewal district of Punjab, Pakistan, environmental changes, and anthropogenic activities have made groundwater extremely vulnerable in the past forty years. Sixty-eight groundwater samples were collected from the study area, major ions and trace elements were analyzed. The Principal Component Analysis and Cluster Analysis were used to identify the major factors influencing groundwater quality, as well as to assess its suitability for drinking and irrigation in southern Punjab. The aquifers are slightly acidic to alkaline, according to the pH (6.9–9.2) of groundwater. Significant cations are distributed as follows: Na+ > Ca2+ > Mg2+ > K+, while anions are distributed as HCO3− > SO42− > Cl−. The main hydrochemical facies are mixed Na·Ca-HCO3 and Na·Ca (Mg)-HCO3·SO4. Rock weathering processes, such as the dissolution of calcite, dolomite, and gypsum minerals, governed groundwater hydrochemistry. The water quality index (WQI) indicates that 17.64% of the water samples are unsuitable to drink. However, according to the Wilcox diagram, the USSL diagram, and some other agricultural indices, approximately 68% of the groundwater samples are suitable for irrigation.

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Shallow urban aquifers under hyper-recharge equatorial conditions and strong anthropogenic constrains. Implications in terms of groundwater resources potential and integrated water resources management strategies

Cited by 16 publications

References 58 publications

Insight into Groundwater Resources along the Coast of Benin (West Africa) through Geochemistry and Isotope Hydrology; Recommendations for Improved Management

Insight into Groundwater Resources along the Coast of Benin (West Africa) through Geochemistry and Isotope Hydrology; Recommendations for Improved Management

Uncertainty in groundwater recharge estimation using groundwater level fluctuation and aquifer test

Hydrogeochemical evolution processes and evaluation of groundwater suitability for domestic and agricultural utility in Southern Punjab, Pakistan

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