Using geochemical data and modelling to enhance the understanding of groundwater flow in a regional deep aquifer, Aquitaine Basin, south-west of France

André, Laurent; Franceschi, Michel; Pouchan, Pierre; Atteia, Olivier

doi:10.1016/j.jhydrol.2004.08.027

Cited by 142 publications

(67 citation statements)

References 26 publications

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“…Les éléments qui se mélangent à cette ressource lui confèrent un chimisme particulier traduisant certaines propriétés ou spécificités intrinsèques à son trajet (Xiao et al, 2012). En traversant donc des couches géologiques plus ou moins perméables, l'eau souterraine est susceptible de présenter une augmentation de sa minéralisation par lessivage des roches, notamment en cas de nappes libres (Andre et al, 2005 ;Adrian et al, 2005). Cette situation peut donner lieu à des atteintes graves à la qualité de l'eau par contamination verticale due aux activités anthropogènes (Yassir et Amira, 2013 ;Omar et al, 2014 ;Ntep et al, 2014 Plusieurs études ont été effectuées au Cameroun, en hydrologie, hydrogéologie, hydrogéohimie, et hydrobiologie au cours de la dernière décennie (Njiné et al, 2001 ;Moundi, 2004 ;Moundi et al, 2007 ;Tita, 2008 ;Mouncherou et al, 2011).…”

Section: Introductionunclassified

Hydrochimie et potabilité des eaux du bassin versant du Nchi dans le plateau Bamoun (Ouest Cameroun)

Mfonka¹,

Ngoupayou²,

Ndjigui³

et al. 2015

Int. J. Bio. Chem. Sci

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, Tél : (237)674753688/261332015759 RESUME Comme dans la plupart des métropoles camerounaises, l'Approvisionnement en Eau Potable (AEP) dans le périmètre urbain de Foumban reste un défi majeur pour les populations. L'objectif de ce travail est de comprendre la dynamique hydrochimique et le niveau de vulnérabilité des eaux de cette zone située dans le bassin versant du Nchi, plateau Bamoun, à l'Ouest du Cameroun. La méthodologie mise en oeuvre a consisté d'une part au suivi des paramètres physico-chimiques dans les eaux du cours d'eau Nchi et les eaux de nappes et d'autre part, à la caractérisation des paramètres bactériologiques dans les eaux souterraines sélectionnées en fonction de leur répartition spatiale et de leur sollicitation par les populations. Les résultats montrent que ces eaux sont acides à neutres (5.3 ≤ pH ≤ 7,7) et faiblement minéralisées [(15 µS/cm < C.E < 164,9 µS/cm) et (184 µeq/l ≤ TZ + ≤ 1565 µeq/l)]. La concentration moyenne de la silice pondérée par les débits est de 23,55 mg/l et représente 59,33% de la somme de matières dissoutes minérales (TDS) qui est de 39,68 mg/l. L'ordre de grandeur décroissant des éléments majeurs dans les eaux du bassin versant du Nchi est le suivant : HCO -3 > Ca 2+ > Mg 2+ >Na + > K + > NO 3 -≥ Cl -traduisant ainsi des eaux bicarbonatées calci-magnésiennes. Les variations spatiales des différentes espèces chimiques montrent de fortes concentrations dans les eaux de nappe par rapport aux eaux d'écoulement. Les analyses statistiques, les variations temporelles des minéraux dissouts et des fortes corrélations inter-élémentaires observées traduisent de leur origine commune qui est surtout l'altération chimique. L'analyse bactériologique met en évidence l'absence des streptocoques fécaux (SF) dans les puits P1 et P4 et la présence remarquée des coliformes fécaux (CF) qui sont de 30 UFC/100 ml, 20 UFC/100 ml et 36 UFC/100 ml respectivement dans les puits P1, P4 et la source S1. La présence de ces bactéries thermo-tolérantes, de même que les nitrates fortement représentés dans les eaux souterraines de la ville de Foumban montrent que ces eaux présentent une dégradation liée aux activités humaines. © 2015 International Formulae Group. All rights reserved. Mots clés:Lithologie, anthropisation, qualité de l'eau, altération chimique, bassin versant du Nchi, plateau Bamoun. Hydrochemistry and potability of water from the watershed Nchi in Bamoun plateau (West Cameroon) ABSTRACTAs it is the case in most of Cameroonian towns, the Water Supply (WS) in the Foumban urban area remains a major challenge to its inhabitants. The objective of this work is to understand the hydrochemical dynamics and the vulnerability of the water of this area located in the Nchi watershed, Bamoun plateau, West Cameroon. The methodology firstly consisted in the monitoring of physico-chemical parameters in the river Z. MFONKA et al. / Int. J. Biol. Chem. Sci. 9(4): 2200-2218, 2015 2201 Nchi and the underground water. Secondly, in the characterization of bacteriological parameters in underground wate...

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Section: Introductionunclassified

Hydrochimie et potabilité des eaux du bassin versant du Nchi dans le plateau Bamoun (Ouest Cameroun)

Mfonka¹,

Ngoupayou²,

Ndjigui³

et al. 2015

Int. J. Bio. Chem. Sci

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“…Inverse geochemical modelling has been widely applied in studies of groundwater geochemical evolution (Andre et al, 2005;Dai et al, 2006;Edmunds, 2009;Gi-Tak et al, 2006;Mahlknecht et al, 2003;Mukherjee and Fryar, 2008;Sharif et al, 2008). In the inverse modelling approach, the geochemical and isotopic compounds within the initial and final members are used to deduce the chemical reactions and mass transformations that have taken place during the process of geochemical evolution from an initial member to a final one.…”

Section: Inverse Geochemical Modellingmentioning

confidence: 99%

Recharge processes and groundwater evolution of multiple aquifers, Beijing, China

Wu¹,

Wang²,

Lin³

et al. 2012

Proceedings of the Institution of Civil Engineers - Water Manag

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A geological and hydrogeological survey was performed in the upper alluvial and proluvial fan and the northern mountain area of the Chaobai River in Beijing. Samples of local precipitation, surface water and groundwater (including spring discharges, groundwater from the fractured bedrock, and shallow and deep groundwater of the alluvium) were collected and analysed to assemble hydrochemical and isotopic data. Q-mode hierarchical cluster analysis (HCA) was used to classify the groundwater samples from multiple aquifers into objective groups. Two groups and six subgroups with distinct groundwater recharge sources, flowpath histories and geochemical evolution histories were identified. Inverse geochemical modelling was adopted to study the deep groundwater chemical evolution. Hydrochemical data and isotopic data on 2 H, 3 H and 18 O were used to evaluate groundwater recharge, flowpath histories and geochemical evolution, and 87 Sr was used to provide further insight into groundwater recharge sources and flow directions. It was found that particularly in areas of groundwater cones of depression, the deep alluvial groundwater may be partly derived from the groundwater of the underlying fractured bedrock. The phreatic, or unconfined, groundwater within the northern area of the alluvial and proluvial fan is sustained mainly by the lateral flow of groundwater from the piedmont regions and by recharge from surface water bodies such as the Miyun reservoir. The shallow alluvial groundwater within the central and southern areas of the alluvial and proluvial fan is recharged primarily by the local precipitation and agricultural irrigation. The deep alluvial groundwater within the central and southern areas of the fan is sustained chiefly by the flow of groundwater from the northern area of the fan or from the underlying fractured bedrock. Methodologies adopted in this work may be useful to future investigation of groundwater in multiple aquifer systems similar to this area.

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“…The characteristics of groundwater chemistry are primarily influenced by recharge water chemistry, water-rock interactions, solute transport, and chemical processes occurring along the flow paths [6][7][8][9][10]. By analyzing the hydrochemical and isotopic data together with considering the hydrogeological conditions, the origins, chemical compositions, and dominating hydrochemical processes (e.g., water-rock interactions, evaporation, and mixing between different water) of groundwater in aquifers can be assessed comprehensively [11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Hydrochemistry and Isotope Hydrology for Groundwater Sustainability of the Coastal Multilayered Aquifer System (Zhanjiang, China)

Zhou

Lu³

2017

Geofluids

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Groundwater sustainability has become a critical issue for Zhanjiang (China) because of serious groundwater level drawdown induced by overexploitation of its coastal multilayered aquifer system. It is necessary to understand the origins, material sources, hydrochemical processes, and dynamics of the coastal groundwater in Zhanjiang to support its sustainable management. To this end, an integrated analysis of hydrochemical and isotopic data of 95 groundwater samples was conducted. Hydrochemical analysis shows that coastal groundwater is fresh; however, relatively high levels of Cl − , Mg 2+ , and total dissolved solid (TDS) imply slight seawater mixing with coastal unconfined groundwater. Stable isotopes ( 18 O and 2 H) values reveal the recharge sources of groundwater in the multilayered aquifer system. The unconfined groundwater originates from local modern precipitation; the confined groundwater in mainland originates from modern precipitation in northwestern mountain area, and the confined groundwater in Donghai and Leizhou is sourced from rainfall recharge during an older period with a colder climate. Ionic relations demonstrate that silicate weathering, carbonate dissolutions, and cation exchange are the primary processes controlling the groundwater chemical composition. Declining trends of groundwater level and increasing trends of TDS of the confined groundwater in islands reveal the landward extending tendency of the freshwater-seawater mixing zone.

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Using geochemical data and modelling to enhance the understanding of groundwater flow in a regional deep aquifer, Aquitaine Basin, south-west of France

Cited by 142 publications

References 26 publications

Hydrochimie et potabilité des eaux du bassin versant du Nchi dans le plateau Bamoun (Ouest Cameroun)

Hydrochimie et potabilité des eaux du bassin versant du Nchi dans le plateau Bamoun (Ouest Cameroun)

Recharge processes and groundwater evolution of multiple aquifers, Beijing, China

Hydrochemistry and Isotope Hydrology for Groundwater Sustainability of the Coastal Multilayered Aquifer System (Zhanjiang, China)

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