Hydrochemical borehole logs characterizing fluoride contamination in a crystalline aquifer (Maheshwaram, India)

Pauwels, Hélène; Négrel, Philippe; Dewandel, Benoı̂t; Perrin, José; Mascre, C.; Roy, Stéphane; Ahmed, Shakeel

doi:10.1016/j.jhydrol.2015.03.017

Cited by 18 publications

(12 citation statements)

References 42 publications

(64 reference statements)

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…These findings are compatible with results from earlier hydrochemical studies in the fractured granitic setting in India with intense pumping (e.g. Perrin et al 2011b;Guihéneuf et al 2014;Pauwels et al 2015). The findings from our study, and others mentioned above, to some extent contrast with those of Sukhija et al (2006) and Reddy et al (2009), who found groundwater ages of >1,300 years at selected sites/depths and a systematic variation of hydrochemistry with groundwater flow direction and age in over-exploited granitic terrains near Hyderabad.…”

Section: Evolution Of Groundwater Connectivity and Implications For Bsupporting

confidence: 92%

Groundwater connectivity of a sheared gneiss aquifer in the Cauvery River basin, India

et al. 2020

View full text Add to dashboard Cite

Connectivity of groundwater flow within crystalline-rock aquifers controls the sustainability of abstraction and baseflow to rivers, yet is often poorly constrained at a catchment scale. Here groundwater connectivity in a sheared gneiss aquifer is investigated by studying the intensively abstracted Berambadi catchment (84 km 2) in the Cauvery River Basin, southern India, with geological characterisation, aquifer properties testing, hydrograph analysis, hydrochemical tracers and a numerical groundwater flow model. The study indicates a well-connected system, both laterally and vertically, that has evolved with high abstraction from a laterally to a vertically dominated flow system. Likely as a result of shearing, a high degree of lateral connectivity remains at low groundwater levels. Because of their low storage and logarithmic reduction in hydraulic conductivity with depth, crystalline-rock aquifers in environments such as this, with high abstraction and variable seasonal recharge, constitute a highly variable water resource, meaning farmers must adapt to varying water availability. Importantly, this study indicates that abstraction is reducing baseflow to the river, which, if also occurring in other similar catchments, will have implications downstream in the Cauvery River Basin.

show abstract

Section: Evolution Of Groundwater Connectivity and Implications For Bsupporting

confidence: 92%

Groundwater connectivity of a sheared gneiss aquifer in the Cauvery River basin, India

et al. 2020

View full text Add to dashboard Cite

show abstract

“…Chabaux et al 2017;Babaye et al 2019). Consequently, the composite aquifer may show a strong vertical hydrogeochemical stratification, both in the saprolite (Durand et al 2006;de Montety et al 2018) and in the SFL (Alazard et al 2016)-for example, in some watersheds, there is an increase of fluoride concentration with depth (Pauwels et al 2015), and an increase of ages with depth, even in the saprolite (de Montety et al 2018). In Brittany (France), de Montety et al 2018 in fact showed that the groundwater mean residence time at the bottom of a 15-20-m-thick saprolite layer can reach 10-15 years.…”

Section: Hydrogeological Functioning Of Hr Aquifers: Hydrochemistrymentioning

confidence: 99%

Review: Hydrogeology of weathered crystalline/hard-rock aquifers—guidelines for the operational survey and management of their groundwater resources

2021

View full text Add to dashboard Cite

Hard rocks or crystalline rocks (i.e., plutonic and metamorphic rocks) constitute the basement of all continents, and are particularly exposed at the surface in the large shields of Africa, India, North and South America, Australia and Europe. They were, and are still in some cases, exposed to deep weathering processes. The storativity and hydraulic conductivity of hard rocks, and thus their groundwater resources, are controlled by these weathering processes, which created weathering profiles. Hard-rock aquifers then develop mainly within the first 100 m below ground surface, within these weathering profiles. Where partially or noneroded, these weathering profiles comprise: (1) a capacitive but generally low-permeability unconsolidated layer (the saprolite), located immediately above (2) the permeable stratiform fractured layer (SFL). The development of the SFL’s fracture network is the consequence of the stress induced by the swelling of some minerals, notably biotite. To a much lesser extent, further weathering, and thus hydraulic conductivity, also develops deeper below the SFL, at the periphery of or within preexisting geological discontinuities (joints, dykes, veins, lithological contacts, etc.). The demonstration and recognition of this conceptual model have enabled understanding of the functioning of such aquifers. Moreover, this conceptual model has facilitated a comprehensive corpus of applied methodologies in hydrogeology and geology, which are described in this review paper such as water-well siting, mapping hydrogeological potentialities from local to country scale, quantitative management, hydrodynamical modeling, protection of hard-rock groundwater resources (even in thermal and mineral aquifers), computing the drainage discharge of tunnels, quarrying, etc.

show abstract

“…A salinização, seja ela proveniente da evaporação ou interação rocha-água, pode fazer com que as águas se tornem impróprias para o uso agrícola, ou ainda promover a elevação das concentrações de espécies químicas nocivas à saúde humana. Dentre as espécies químicas mais nocivas associadas à salinização, destaca-se o Fe o Cl -, particularmente em climas áridos (PAUWELS et al 2015, NAGARAJU et al 2016, LI et al 2016, ADIMALLA & LI 2019.…”

Section: Introductionunclassified

Avaliação de processos naturais de salinização de águas subterrâneas na porção leste da bacia do rio Cachoeira, Bahia

Teramoto¹,

Chang²

2020

Rev. Inst. Geol.

View full text Add to dashboard Cite

Parcela significativa do nordeste brasileiro se notabiliza pela escassez hídrica, que é responsável por implicações socioeconômicas locais negativas. Além do déficit hídrico, esta região é afetada pela salinização de águas subterrâneas, que contribui para a perda de potabilidade da água. Na bacia do rio Cachoeira, Estado da Bahia, situada no limite do semiárido nordestino, as águas subterrâneas possuem concentração de sais dissolvidos naturalmente elevados em razão das altas taxas de evapotranspiração e interação rocha-água. Para a avaliação quantitativa desses processos nas concentrações de sais totais dissolvidos, foram empregadas técnicas estatísticas e simulações geoquímicas. Na análise das Componentes Principais verificou-se que os Componentes Principais 1 (CP1) e 2 (CP2) respondem, respectivamente, por 82,89 e 13,68% da variância das amostras analisadas. Enquanto o CP1 é majoritariamente atribuído a variações na concentração do íon HCO3 - , o CP2 é atribuído a variações na concentração do íon Cl- . Verificou-se três diferentes tendências, que descrevem variações distintas do CP2 em função daquelas observadas para CP1, refletindo diferentes proporções na importância da evapotranspiração e interação rocha-água na salinidade. As simulações geoquímicas foram capazes de reproduzir as concentrações das amostras mais salinas, a partir da evaporação e de reações rocha-água. A maior parte das amostras de água subterrânea agrupam-se ao longo da Tendência 3, cujo incremento de sólidos totais dissolvidos é majoritariamente explicado pela interação rocha-água. Em oposição, as amostras de água das Tendências 1 e 2, menos frequentes, possuem sólidos totais dissolvidos majoritariamente provenientes da evaporação da água.

show abstract

Hydrochemical borehole logs characterizing fluoride contamination in a crystalline aquifer (Maheshwaram, India)

Cited by 18 publications

References 42 publications

Groundwater connectivity of a sheared gneiss aquifer in the Cauvery River basin, India

Groundwater connectivity of a sheared gneiss aquifer in the Cauvery River basin, India

Review: Hydrogeology of weathered crystalline/hard-rock aquifers—guidelines for the operational survey and management of their groundwater resources

Avaliação de processos naturais de salinização de águas subterrâneas na porção leste da bacia do rio Cachoeira, Bahia

Contact Info

Product

Resources

About