Avaliação hidrogeológica e hidroquímica do Aquífero Dunas na região da reserva de desenvolvimento sustentável Ponta do Tubarão - (RDSEPT)
The Ponta do Tubarão State Sustainable Development Reserve region is located on the northern coast of the state of Rio Grande do Norte and is part of the Potiguar Basin. It has an area of 130 km2 divided into a marine portion, coastal board, mangroves and 47.25 km2 of vegetated and non-vegetated...
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| Formato: | Dissertação |
| Idioma: | pt_BR |
| Publicado em: |
Brasil
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| Endereço do item: | https://repositorio.ufrn.br/jspui/handle/123456789/27791 |
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| Resumo: | The Ponta do Tubarão State Sustainable Development Reserve region is located on
the northern coast of the state of Rio Grande do Norte and is part of the Potiguar Basin.
It has an area of 130 km2 divided into a marine portion, coastal board, mangroves and
47.25 km2 of vegetated and non-vegetated dunes that support a dune aquifer system
and provides fresh water to local and surrounding population. Maintains the estuarine
system, rich in animal and plant species. The main objective of this research was to
investigate and evaluate the hydrogeology, hydrochemistry and behavior of the Dunas
Aquifer. The climate of the region is semi-arid, with an average rainfall of 521 mm /
year and potential evapotranspiration of 2,054 mm / year, characterizing a high water
deficit of 1533 mm / year. The hydraulic transmissivity (T) parameters of 1.67 x 10-3 m2
/ s, hydraulic conductivity (K) of 4.13 x 10-4 m / s and specific porosity (μ) of 5%, found
in previous work. For the potentiometric map 56 wells were registered, distributed in
the study area. It was identified that in the area there is a divergent underground flow
divider promoting one flow towards the ocean and another in the opposite direction.
For hydrochemical evaluation, Piper, Stiff and Durov expanded graphs were used.
Twenty water samples from wells and one from surface water (lagoon) were selected,
distributed in the research space to better represent the hydrochemical characteristics
and their interaction with the geological nature of the aquifer extracts. Regarding the
chemical quality of the waters, of the 21 samples analyzed, 11 are in the classification
range for freshwater, 7 for brackish water and 3 for saltwater. The bicarbonated type
predominates in these waters (48%), with a higher incidence of calcic bicarbonated
waters (33%) which often suggest carbonate and sodium chlorinated recharge waters
(24%) suggesting the influence of seawater, ancient saline waters. or dissolution of
halite. Groundwater tends to change facies, indicating simple dissolution or mixing
during groundwater flow. |
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