Banca de QUALIFICAÇÃO: RAFAELA DA SILVA ALVES

Uma banca de QUALIFICAÇÃO de DOUTORADO foi cadastrada pelo programa.
DISCENTE : RAFAELA DA SILVA ALVES
DATA : 05/12/2018
HORA: 08:30
LOCAL: Auditório do Departamento de Geofísica
TÍTULO:

Numerical modeling and behavior analysis of an unconfined aquifer under structural conditioning

PALAVRAS-CHAVES:

fault zones; unconfined aquifer; numeric model; hydraulic conductivity

PÁGINAS: 30
GRANDE ÁREA: Ciências Exatas e da Terra
ÁREA: Geociências
RESUMO:

The occurrence of fault zones in clastic nature aquifers, in addition to conditioning their geometry in terms of structural compartmentalization, provides an increase in their anisotropy. The present research aims to analyze the behavior of fault zones in the hydrogeological context of an unconfined aquifer, having as an example an area in the northeastern part of Brazil. The methodology was based on the use of inverse models of VES, 2D geoelectric imaging and correlation of pumping wells profiles, these destined to deepen local structuring. Subsequently, numerical models composing three geological layers developed in Visual MODFLOW platform were added to this context, in addition to the reinterpretation of aquifer tests. This methodology allowed to recognize the strong influence of the main fault zones in the study area, highlighting the resulting anisotropy in the aquifer in the form of lateral contacts between zones of different hydraulic conductivities. In numerical modeling, the connection between the aquifer and the fault zones were satisfactorily simulated in the form of permeable boundaries, revealing through inflections in the equipotential curves and residual error in the order of 8.9%. This context is compatible with an increase in hydraulic conductivity in the considered fault zones. In addition, the aquifer tests corroborated this observation, since they showed a trend of recovery of dynamic levels as the respective cones of depression of the pumped wells reach the fault zones. Therefore, the damage zones of these faults behave like a conduit conducive to the underground flow.

MEMBROS DA BANCA:
Interno - 350640 - FRANCISCO HILARIO REGO BEZERRA
Presidente - 1714488 - LEANDSON ROBERTO FERNANDES DE LUCENA
Externo à Instituição - NATALINA MARIA TINOCO CABRAL - FUNASA