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Regional groundwater modeling of the guarani aquifer system
(2020-09-01)
The Guarani Aquifer System (GAS) is a strategic transboundary aquifer system shared by Brazil, Argentina, Paraguay and Uruguay. This article presents a groundwater flow model to assess the GAS system in terms of regional ...
Hydrogeochemistry zoning of the são paulo state aquifer systems as a groundwater management toolZoneamento hidrogeoquímico dos sistemas aquíferos do estado de são paulo como ferramenta de gestão das águas subterrâneas
(2020-01-01)
In São Paulo State, five aquifer systems (Bauru, Serra Geral, Guarani, Tubarão and Pré-Cambriano) are responsible for population supply. Despite the large knowledge about these aquifers, just a few studies have been done ...
Groundwater flow and residence time in a karst aquifer using ion and isotope characterization
(Springer, 2016-11)
In order to identify the origin of the main processes that affect the composition of groundwater in a karstic aquifer, a hydrogeochemical and isotopic study was carried out of water from numerous observation wells located ...
Geochemical evolution, residence times and recharge conditions of the multilayered Tubarão aquifer system (State of São Paulo–Brazil) as indicated by hydrochemical, stable isotope and 14C data
(2020-01-01)
The Tubarão aquifer system constitutes a very complex, multilayered aquifer enclosed in the Paraná basin (central-southern part of Brazil). Despite the relatively low productivity of wells, groundwater represents an important ...
Groundwater residence time based 3H/3He determinations and agricultural pollutrants in the pampeano aquifer (Argentina) orrganochlorines compounds and nitrogen isotopes
(Organismo Internacional de Energía Atómica, 2015)
The agriculture represents the main activity in Argentina with an intensive use of agrochemicals. Among them, nitrates and organochlorine pesticides, highly persistent, were used since 1945, but nowadays are forbidden. ...
U-ages in soils and groundwater evidencing wet periods 400-600 kyr ago in southeast Brazil
(Elsevier B.V., 2007-07-01)
U-238 and its radiogenic daughter U-234 have been utilized for dating soil formation and groundwater residence time during the last 1.5 million years, in this case based on the U-clissolution/precipitation occurring during ...
U-ages in soils and groundwater evidencing wet periods 400-600 kyr ago in southeast Brazil
(Elsevier B.V., 2007-07-01)
U-238 and its radiogenic daughter U-234 have been utilized for dating soil formation and groundwater residence time during the last 1.5 million years, in this case based on the U-clissolution/precipitation occurring during ...
Tracing groundwater discharge in the floodplain of the Parana River, Argentina: Implications for its biological communities
(John Wiley & Sons Ltd, 2014-02)
Groundwater discharge can be an important determinant of the functioning of aquatic environments and their associated biological communities. However, the presence and the importance of groundwater have not been considered ...
Hydrochemistry of the Guarani Aquifer System modulated by mixing with underlying and overlying hydrostratigraphic units
(2020-08-01)
Study region: São Paulo State, Southeastern, Brazil. Study focus: Several studies were conducted on the Guarani Aquifer System (GAS), with as main focus the identification of major stratigraphic units and hydrodynamic ...