Fluoride characterization by principal component analysis in the hydrochemical facies of Serra Geral Aquifer System in Southern Brazil

Anais da Academia Brasileira de Ciências

Arthur Nanni²  Ari Roisenberg¹  Jandyra M.g. Fachel¹  Gilberto Mesquita¹  Cristiano Danieli¹ 

[1] ,UFRGS Instituto de Geociências Departamento de GeoquímicaPorto Alegre RS ,Brasil

关键词: fractured aquifer;    geostatistics;    GIS;    groundwater;    hydrogeology;    aqüífero fraturado;    geoestatística;    SIG;    águas subterrâneas;    hidrogeologia;   

DOI  :  10.1590/S0001-37652008000400010

来源: SciELO

【 摘 要 】

Principal component analysis is applied to 309 groundwater chemical data information from wells in the Serra Geral Aquifer System. Correlations among seven hydrochemical parameters are statistically examined. A four-component model is suggested and explains 81% of total variance. Component 1 represents calcium-magnesium bicarbonated groundwaters with long time of residence. Component 2 represents sulfated and chlorinated calcium and sodium groundwaters; Component 3 represents sodium bicarbonated groundwaters; and Component 4 is characterized by sodium sulfated with high fluoride facies. The components' spatial distribution shows high fluoride concentration along analyzed tectonic fault system and aligned on northeast direction in other areas, suggesting other hydrogeological fault systems. High fluoride concentration increases according to groundwater pumping depth. The Principal Component Analysis reveals features of the groundwater mixture and individualizes water facies. In this scenery, it can be determined hydrogeological blocks associated with tectonic fault system here introduced.

【 授权许可】

CC BY   
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