Hydrogeochemical and Flow Modeling of Aquitard Percolation in the Cariri Valley-Northeast Brazil |
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| Authors: | Carlos José Freire Machado Maria Marlúcia Freitas Santiago Luiz Alberto Ribeiro Mendonça Horst Frischkorn Josué Mendes Filho |
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| Institution: | (1) Universidade Federal do Pará/Campus de Santarém, Física, PA, CEP 68040-070, Brazil;(2) Depto. de Física, Universidade Federal do Ceará, Fortaleza, Ceara, CEP 60455-760, Brazil;(3) Depto. Hidrologia, CENTEC, Juazeiro do Norte, Fortaleza, Ceará, Brazil;(4) Depto. Engenharia Hidráulica e Ambiental, Universidade Federal do Ceará, Fortaleza, Ceará, Brazil |
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| Abstract: | Flow modeling and hydrogeochemical inversion calculations were performed on the aquifer systems of the Crato-Juazeiro Graben
in the Araripe Sedimentary Basin of the Cariri Valley, Northeast Brazil, in order to assess aquifer interconnections through
an aquitard of the Araripe Plateau. Steady state hydraulic head numeric calculations with the finite difference method used
Modflow software with hydrologically based boundary conditions and a piezometric surface as initial condition. Hydrogeochemical
inversion with PHREEQC was performed for two water samples representing typical initial and final waters along the flow path.
Flow simulation shows that approximately 20% of all recharge water from the superior aquifer system passes through the Santana
aquitard reaching the middle aquifer system. Quantification of mineral dissolution/precipitation processes, ion exchange and
microbiological redox reactions taking place in the aquifer systems also indicates hydraulic interconnection of the superior
and middle aquifer systems through the Santana aquitard. |
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| Keywords: | Hydrogeochemistry PHREEQC Modflow Araripe Sedimentary Basin Cariri Valley |
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