Hidroquímica e vulnerabilidade do Sistema Aquífero Barreiras na Bacia Hidrográfica do Rio Pirangi/RN
The study area is located in the Pirangi River Basin, Metropolitan Region of Natal, covering 370 km². The Barreiras Aquifer System (SAB) in the study area has high hydrogeological potential and the capture of its waters has been essential for the water supply of urban and rural populations and th...
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| Formato: | Dissertação |
| Idioma: | pt_BR |
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Brasil
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| Endereço do item: | https://repositorio.ufrn.br/jspui/handle/123456789/28899 |
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| Resumo: | The study area is located in the Pirangi River Basin, Metropolitan Region of
Natal, covering 370 km². The Barreiras Aquifer System (SAB) in the study area
has high hydrogeological potential and the capture of its waters has been
essential for the water supply of urban and rural populations and the industrial
and agricultural development of the region. However, disordered urban growth
and the adoption of inappropriate agricultural practices have threatened the
quality of this underground spring. Based on the above, this study evaluates the
hydrochemical behavior and water quality of SAB in the Pirangi River Basin
region, as well as mapping the natural and anthropic vulnerability to aquifer
contamination. The analyzes consider mapping of land use and occupation. For
the hydrochemical study, a 30-well monitoring network was defined, followed by
a collection campaign and physicochemical analysis of water samples. The
interpretation of the results was made through isovalor maps and
hydrochemical diagrams. Regarding water quality, groundwater was evaluated
for human consumption, agricultural purposes and industrial use. The mapping
of SAB vulnerability to contamination was performed by applying GOD,
DRASTIC and IS methods based on the analysis and interpretation of 38
lithological profiles of wells distributed in the study area and cartographic data
from previous works. Despite the hydrochemical variations observed in the
different sectors, SAB groundwater in the study area is generally characterized
as slightly acidic and of low salinity, predominantly encompassing magnesian
sodium chloride (Na + - Mg2 + - Cl-) and chlorinated sodium facies. (Na + - Cl-).
The climatic aspect is the main controlling factor of the chemistry of these
waters, with the influence of anthropogenic factors of urban development and
agricultural activities (nitrate contamination). As for quality, 70% of the samples
evaluated can be destined for human consumption; for agricultural purposes
there is no restriction on use; and for industrial application there were mainly
restrictions on the paper, textile, beer, dairy and canning industries. The
mapping of vulnerability to SAB contamination resulted in a predominantly low
and intermediate vulnerability index for the urban zone through the GOD and
DRASTIC methods and an intermediate index through the IS method. In the
areas of agricultural development and in the area of lagoons and dunes with little human intervention, low and intermediate vulnerability indices were determined using the DRASTIC and IS methods, while the GOD method has a predominance of high vulnerability. |
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