Ground Water movement in crystalline rock aquifers
Description
Ground water movement studies were performed in crystalline rock aquifers from the upper Acarau River hydrographic basin, state of Ceara, Brazil. The studies included carbon-14, 18O/16O and tritium measurements as well as chemical analysis. A total of 35 wells were surveyed during drought seasons. Carbon-14 values displayed little variation which implied that the water use was adequate despite of the slower recharge conditions. Fairly constant isotopic 18O/16O ratio values in the wells and their similarity with rainwater values indicated that the recharge is done exclusively by pluvial waters. A decreasing tendency within the tritium concentration values were interpreted as a periodic rainwater renewal for these aquifers. The chemical analysis demonstrated that there is in fact no correlation between salinity and the time the water remains in the aquifer itself. (D.J.M.)
Availability note (English)
MF available from INIS under the Report Number.Abstract (Portuguese)
Elaboram-se estudos sobre o movimento subterraneo de aguas em aquiferos situados em rochas cristalinas no alto da bacia hidrografica do rio Acarau, Ceara, atraves de medidas de carbono-14, 18O/16O, tricio e analise quimica numa serie de 35 pocos, durante periodos marcados por estiagem. Observou-se que os valores de carbono-14 apresentaram poucas mudancas o que indica que o uso da agua foi adequado mesmo em condicoes de recarga dificil. Valores quase constantes da razao isotopica 18O/16O nos pocos e sua semelhanca com a da chuva revelaram que a recarga e feita exclusivamente com aguas pluviais. Constatou-se uma tendencia ao decrescimo nos valores de concentracao de tricio motivado por uma renovacao periodica com agua de chuva. As analises quimicas, por sua vez, demonstraram que nao existe uma firme correlacao entre salinidade e o tempo de permanencia da agua no aquifero. (D.J.M.)Files
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Additional details
Additional titles
- Original title (Portuguese)
- Movimento subterraneo de aguas em aquiferos situados em rochas cristalinas
- Augmented title (English)
- State of Ceara, Brazil
Publishing Information
- Imprint Pagination
- 67 p.
- Report number
- INIS-BR--557
INIS
- Country of Publication
- Brazil
- Country of Input or Organization
- Brazil
- INIS RN
- 17087430
- Subject category
- S58: GEOSCIENCES;
- Resource subtype / Literary indicator
- Numerical Data
- Descriptors DEI
- AQUIFERS; CARBON 14; EVALUATED DATA; GEOCHEMICAL SURVEYS; GROUND WATER; HYDROLOGY; ISOTOPE RATIO; OXYGEN 16; OXYGEN 18; STATISTICAL DATA; TRITIUM
- Descriptors DEC
- BETA DECAY RADIOISOTOPES; BETA-MINUS DECAY RADIOISOTOPES; CARBON ISOTOPES; DATA; EVEN-EVEN NUCLEI; GEOLOGIC SURVEYS; HYDROGEN COMPOUNDS; HYDROGEN ISOTOPES; INFORMATION; ISOTOPES; LIGHT NUCLEI; NUCLEI; NUMERICAL DATA; ODD-EVEN NUCLEI; OXYGEN COMPOUNDS; OXYGEN ISOTOPES; POLAR SOLVENTS; RADIOISOTOPES; SOLVENTS; STABLE ISOTOPES; WATER; YEARS LIVING RADIOISOTOPES