Arid Zone Hydrology—Recent Developments

Schoeller, Henri

doi:10.1097/00010694-196008000-00033

Cited by 28 publications

(16 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Other studies on salinization of groundwaters by evaporation (Schoeller, 1959;Cruz & Melo, 1968;Silva Júnior et al, 1999;Lopes, 2008) corroborate these results, which are consistent with the study of Robaux (1953) for arid zones, who found that direct evaporation acts up to 2 m deep, but considers that it can reach 22 m in alluvial soils, through the influence of capillarity, promoting a progressive salt concentration.…”

Section: Resultssupporting

confidence: 85%

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

Almeida

Frischkorn

2015

Rev. bras. eng. agríc. ambient.

View full text Add to dashboard Cite

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.

show abstract

Section: Resultssupporting

confidence: 85%

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

Almeida

Frischkorn

2015

Rev. bras. eng. agríc. ambient.

View full text Add to dashboard Cite

show abstract

“…The isotope composition is thus expected to follow that of the average precipitation input (discounting both small and large rain events) with a shift towards smaller d-excess values. The latter trend is accentuated in the arid zone, because of the important role of surface runoff as a prerequisite for occurrence of recharge (Schoeller, 1959;Gat, 1988).…”

Section: The Itf (The Local Scale)mentioning

confidence: 99%

Stable water isotopes in the atmosphere/biosphere/lithosphere interface: Scaling-up from the local to continental scale, under humid and dry conditions

Gat

Airey

2006

Global and Planetary Change

View full text Add to dashboard Cite

“…This water type occurs mainly in the southern half of the Basin. Generally, chemical evolution of groundwater along a flow path tends towards the composition of seawater as envisaged in Chebotarev (1955), or Ignatovich and Souline (Schoeller 1959) evolutionary sequence.…”

Section: Hydrochemical Faciesmentioning

confidence: 99%

The hydrochemistry of groundwater in the Densu River Basin, Ghana

Fianko

Adomako

Osae

et al. 2009

Environ Monit Assess

View full text Add to dashboard Cite

Hydrochemical analyses of groundwater samples were used to establish the hydrochemistry of groundwater in the Densu River Basin. The groundwater was weakly acidic, moderately mineralized, fresh to brackish with conductivity ranging from of 96.6 microS cm(-1) in the North to 10,070 microS cm( - 1) in the South. Densu River basin have special economic significance, representing the countries greatest hydrostructure with freshwater. Chemical constituents are generally low in the North and high in the South. The order of relative abundance of major cations in the groundwater is Na+>Ca2+>Mg2+>K+ while that of anions is Cl->HCO3->SO4(2-)>NO3-. Four main chemical water types were delineated in the Basin. These include Ca-Mg-HCO3, Mg-Ca-Cl, Na-Cl, and mixed waters in which neither a particular cation nor anion dominates. Silicate weathering and ion exchange are probably the main processes through which major ions enter the groundwater system. Anthropogenic activities were found to have greatly impacted negatively on the quality of the groundwater.

show abstract

Arid Zone Hydrology—Recent Developments

Cited by 28 publications

References 0 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

Stable water isotopes in the atmosphere/biosphere/lithosphere interface: Scaling-up from the local to continental scale, under humid and dry conditions

The hydrochemistry of groundwater in the Densu River Basin, Ghana

Contact Info

Product

Resources

About