Hydrodynamic Parameters of The Karst-Frissure Aquifer of Lagoa Santa Region, Minas Gerais

Published
2020-07-23
DOI: https://doi.org/10.14295/ras.v34i2.29812
Keywords: Hydraulic conductivity. Bambuí Group. Hydrogeology. Condutividade hidráulica. Grupo Bambuí. Hidrogeologia.

    Authors

  • Rodrigo Sérgio de Paula Universidade Federal de Minas Gerais/Professor Adjunto Departamento Geologia https://orcid.org/0000-0001-5117-3516
  • Gabriela Meira Teixeira Universidade Federal de Minas Gerais/Aluna de Graduação Geologia
  • Carolina Gomes Ribeiro Universidade Federal de Minas Gerais/Aluno de Pós Graduação Geologia
  • Pedro Henrique Pereira da Silva Universidade Federal de Minas Gerais/Aluno de Graduação Geologia
  • Thais Guedes Ayres Silva Universidade Federal de Minas Gerais/Aluno de Pós Graduação Geologia
  • Luisa Costa Martins Vieira Universidade Federal de Minas Gerais/Aluno de Pós Graduação Geologia
  • Leila Nunes Menegasse Velásquez Universidade Federal de Minas Gerais/Professora Titular Departamento Geologia

Abstract

The study area covers the entire region called APA Karst of Lagoa Santa and its surroundings, totalizing 505 km² of area extension, 35 km distant from Belo Horizonte/MG-Brazil. The area has been the center of several undertakings which foresee an increase in the exploration and consumption of water. Due to this growth and the karst system fragility, it becomes of main importance the understanding of the hydrodynamic parameters in order to know the particularities of this aquifer system. Geologically, the region is represented by the carbonatic and metapelitic rocks of the Bambuí Group, in a local context of intense brittle deformation, which govern the groundwater flow direction, from west to east, and determine the particularities of the hydrodynamic parameters. The work purpose was to obtain the values of hydraulic conductivity (K), transmissivity (T), and storage coefficient (S) through the evaluation of recovery tests applying the methods of Hvorslev, Bower e Rice and Cooper-Bredehoeft-Papadopulos. Applications of Hvorslev’s mathematical formulas were used to K and T, and the fracture system evaluation were performed using the mathematical methodology to K. In order to evaluate the proposed methods, 99 recovery tests and 1163 fractures were analyzed for the hydraulic conductivity evaluation. The results were compared in order to assess the most representative method of the karst-fractured system and its representativity in the region. The three classical methods showed similar K and T values, with the modal storage value (10-4) achieved by Cooper, Bredehoef e Papadopulos method. The Snow method was more efficient to calculate K in subsurface (10-3 m/s) being close to the values found by outher authors using tracers. (2019), thereby making it possible to distinguish the vertical levels of hydraulic conductivity in this system.

How to Cite
Paula, R. S. de, Teixeira, G. M., Ribeiro, C. G., Silva, P. H. P. da, Silva, T. G. A., Vieira, L. C. M., & Velásquez, L. N. M. (2020). Hydrodynamic Parameters of The Karst-Frissure Aquifer of Lagoa Santa Region, Minas Gerais. Águas Subterrâneas, 34(2), 221–235. https://doi.org/10.14295/ras.v34i2.29812