Hydroestratigraphy conceptual model of coastal aquifer system northern portion of the State of Rio Grande do Sul

Published
2020-09-08
DOI: https://doi.org/10.14295/ras.v34i3.29883
Keywords: Hydroestratigraphy. Coastal Aquifer System. Geophysical survey reports. Hidroestratigrafia. Sistema Aquífero Costeiro. Perfilagem geofísica.

    Authors

  • Guilherme Casarotto Troian Serviço Geológico do Brasil-CPRM https://orcid.org/0000-0002-4739-7194
  • Pedro Antonio Roehe Reginato Universidade Federal do Rio Grande do Sul
  • Ricardo Giumelli Marquezan Universidade Federal de Pelotas
  • Roberto Kirchheim Serviço Geológico do Brasil - CPRM

Abstract

The expansion of the knowledge of the groundwater resources is of great importance to the decision making processes with regard to management policies. The present work offers substantial contributions to the hydro-stratigraphic characterization of the Coastal Aquifer System on the north coast of the State of Rio Grande do Sul - Brazil. Aquifer geometry was determined by 38 survey profiles done by the Geological Survey of Brazil. The characterization of the different hydro-stratigraphic units was carried out through the analysis and review of geological and constructive profiles of 107 water wells and another 15 geophysical logs containing gamma, resistivity and sonic profiles. Four different hydro-stratigraphic units related to Cenozoic deposits were identified. Each of these units was defined in terms of its granulometric composition, effective porosity and total dissolved solids content of the respective groundwater. Hydro-stratigraphic units 01 and 03 showedhigh values of effective porosity and low salinity as opposed to units 02 and 04 with visibly lower values of effective porosity and higher salinities. The presence of hydro-stratigraphic heterogeneities identified here represents the fundamental scientific contribution of this work.

How to Cite
Troian, G. C., Reginato, P. A. R., Marquezan, R. G., & Kirchheim, R. (2020). Hydroestratigraphy conceptual model of coastal aquifer system northern portion of the State of Rio Grande do Sul. Águas Subterrâneas, 34(3), 264–274. https://doi.org/10.14295/ras.v34i3.29883