Geochemical and isotopic investigations on groundwater residence time and flow in the Independence Basin, Mexico

Mahlknecht, Jürgen; Garfias-Solís, Jaime; Aravena, Ramón; Tesch, Roland

doi:10.1016/j.jhydrol.2005.09.021

Cited by 46 publications

(35 citation statements)

References 18 publications

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“…The quantified mole transfers are consistent with the ones from other studies (Uliana & Sharp, 2001;Mahlknecht et al, 2006;Machado et al, 2007;Sharif et al, 2008), which For all the other wells, the simulations were performed for the same hypothesis and in all of them the results show mole transfers similar to the ones found for the P10 well, with volumetric contributions of water from the fissure aquifer ranging from 1.53 to 27.99% to the enrichment of salts in the water of the alluvial aquifer.…”

Section: Resultssupporting

confidence: 87%

“…In Table 7, where the positive values describe dissolutions and negative values indicate precipitations, the simulation results show that the evolution in salt concentration is due to: dissolution of CO 2 , which favors the increase of the ion bicarbonate in the waters; dissolution of anorthite and K-feldspar; precipitation of albite and K-mica; a small release of methane gas; and ionic exchanges of the cations Ca 2+ , Mg 2+ and Na + , through interaction processes with the metallic ions adsorbed to the clays (Machado et al, 2007) present in the sandy clay soils of the alluvial terrain, favoring the absorption of Ca 2+ and the release of Na + (Mahlknecht et al, 2006).…”

Section: Resultsmentioning

confidence: 99%

“…Many authors have used multivariate statistical analysis in an attempt to describe the hydrogeological processes with interactions of aquifer systems (Ji et al, 2007;Cloutier et al, 2008;Raspa et al, 2008;Pinto et al, 2012) and inverse geochemical modeling (Parkhurst & Appelo, 1999) aiming to describe and identify the hydrogeochemical processes of waterrock interaction (Uliana & Sharp, 2001;Mahlknecht et al, 2006;Sharif et al, 2008), since the weathering of rocks can play a relevant role in the chemistry of the water (Marković et al, 2013).…”

Section: Introductionmentioning

confidence: 99%

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Salinization mechanisms of a small alluvial aquifer in the semiarid region of northeast Brazil

Almeida

Frischkorn

2015

Rev. bras. eng. agríc. ambient.

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A B S T R A C TThe objective of this research was to identify and quantify the primary processes responsible for the increase in salinity observed in the alluvial aquifer during the dry season. Multivariate statistical analysis and inverse geochemical modeling were used to simulate possible salinization mechanisms in the alluvial aquifer. For this, by quantifying electrical conductivity and the concentrations of the ions Ca 2+ , Mg 2+ , Na + , K + , Cl -, HCO 3 -and SO 4 2-in waters from the crystalline basement near the study area, water reservoirs near the alluvial aquifer and the studied alluvial aquifer, groups were formed and discriminant analysis was applied. Significance tests showed that direct evaporation has not only an influence on the alluvial aquifer, but also a mean volumetric contribution of 15.8% from waters of the crystalline basement, accompanied by processes of salt dissolution and precipitation, which would also justify the increase in salinity observed in the alluvial aquifer in the dry period.Mecanismos de salinização de um pequeno aquífero aluvial localizado no semiárido do Nordeste brasileiro R E S U M O Com o objetivo de identificar e quantificar os principais processos responsáveis pelo aumento da salinidade observada durante o período não chuvoso em um pequeno aquífero aluvial localizado no semiárido do Nordeste brasileiro utilizaram-se a análise estatística multivariada e a modelagem geoquímica inversa para simular prováveis mecanismos de salinização no aquífero; para isto e por meio da quantificação da condutividade elétrica e dos íons Ca 2+ , Mg 2+ , Na + , K + , Cl -, HCO 3 -e SO 4 2-em amostras de águas do embasamento cristalino próximo à área de estudo, nos reservatórios próximos ao aquífero aluvial e do aquífero aluvial estudado, foram formados grupos e aplicada a análise discriminante. Testes de significância dos resultados demonstraram que a evaporação direta não apenas exerce influência sobre o aquífero aluvial mas ainda tem uma contribuição volumétrica média de 15,8% de águas do cristalino acompanhada de processos de dissolução e precipitação de sais, o que também justificaria o aumento da salinidade no aquífero aluvial no período seco.

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Section: Resultssupporting

confidence: 87%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Salinization mechanisms of a small alluvial aquifer in the semiarid region of northeast Brazil

Almeida

Frischkorn

2015

Rev. bras. eng. agríc. ambient.

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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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“…Hydrochemical and isotope tracers provide valuable tools for evaluation of groundwater. It is well recognized that major and minor chemical elements may give an insight into water-rock interactions as well as anthropogenic influences affecting the groundwater system as demonstrated in numerous studies (Hem 1989;Mahlknecht et al 2004;Ledesma-Ruiz et al 2015;Cruz-Fuentes et al 2014;Hernández-Antonio et al 2015;Russak et al 2015), while water isotopes may define groundwater recharge areas, mixing and evaporation sources (Edmunds et al 2003;Horst et al 2007;Jiménez-Martínez and Custodio 2008;Mohammed et al 2014;Gonçalvès et al 2015), and radiocarbon isotopes residence times of old groundwater and its distribution (Fontes and Garnier 1979;Clark and Fritz 1997;Edmunds and Smedley 2000;Mahlknecht et al 2006a). More recently, it has been demonstrated that chlorofluorocarbons are useful in evaluating residence times of modern groundwater, mixing patterns and aquifer's vulnerability to contamination (Busenberg and Plummer 1992;Cook et al 1995;Goody et al 2006;Mahlknecht et al 2006b;Horst et al 2008;Darling et al 2012).…”

Section: Introductionmentioning

confidence: 99%

Isotope signatures and hydrochemistry as tools in assessing groundwater occurrence and dynamics in a coastal arid aquifer

et al. 2016

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Groundwater from the La Paz arid coastal aquifer in Baja California, Mexico, is essentially the only source of drinking water for the local population and tourists, as well as irrigation water for agricultural needs. The intensive exploitation of the aquifer and water cycling has resulted in groundwater abatement (up to 10 m) and high salinity (up to *5800 mg l -1 ). A study using hydrochemistry, isotopic (deuterium, oxygen-18 and carbon-14) and gaseous tracers (chlorofluorocarbons CFC-11, CFC-12, CFC-113), as well as multivariate statistics, was developed to elucidate groundwater composition, flow and occurrence. Groundwater is of meteoric origin, and a large proportion is subject to evaporation. The primary natural recharge is generated in the El Novillo and Las Cruces ranges, and groundwater subsequently flows in a SE-NW direction toward the coast. The initial water type is the result of discordant dissolution of silicate minerals and ion exchange on soils. In the lower plain portion, the aquifer system is recharged from irrigation return flow and seawater intrusion, which significantly affects groundwater chemistry. Nitrate and chloride concentrations indicate that groundwater is highly affected by an overuse of fertilizers in agricultural activities, but there is little effect from urban activities. Seawater intrusion has progressed rapidly during the past decade, and the impact currently extends 13 km inland. Radiocarbon residence time calculations suggest that groundwater is modern, with the exception of Chametla and El Centerario sites in the central and western lowlands with ages of up to *5000 years. These waters indicate an additional recharge source for the upconing of fossil groundwater or regional flow.

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Geochemical and isotopic investigations on groundwater residence time and flow in the Independence Basin, Mexico

Cited by 46 publications

References 18 publications

Salinization mechanisms of a small alluvial aquifer in the semiarid region of northeast Brazil

Salinization mechanisms of a small alluvial aquifer in the semiarid region of northeast Brazil

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

Isotope signatures and hydrochemistry as tools in assessing groundwater occurrence and dynamics in a coastal arid aquifer

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