HYDROGEOLOGY OF FRACTURED AQUIFERS: APPLICATION OF CONSISTENCY INDEXES FOR THE VALIDATION OF GEOSPATIAL MATHEMATICAL MODELS

Hidrogeologia de aquíferos fraturados: aplicação de índices de consistência para validação de modelos matemáticos geoespaciais

  • Thiago DE VARGAS Instituto de Pesquisas Hidráulicas (UFRGS)
  • Rossano BELLADONA Serviço Autônomo Municipal de Água e Esgoto
  • Maria Eduarda Ribeiro de SOUZA Serviço Autônomo Municipal de Água e Esgoto

Resumo

In hydrogeology, most studies using interpolators seek to estimate water table elevations, contaminant concentrations and aquifer vulnerability. The primary goal of this research was to evaluate which geospatial interpolator best suits six distinct hydrogeological parameters using nine consistency tests. Water wells were selected on a portion of the Serra Geral Fractured Aquifer System in Southern Brazil. This paper tested the Inverse Distance Weighted, Radial Basis Function, Ordinary kriging, Lognormal kriging and Cokriging methods. The results pointed out that the Inverse Distance Weighted showed better performance for the following parameters: potentiometric surface, first fracture flow zone and second fracture flow zone. Discharge, transmissivity, specific capacity and static level showed low consistency levels, greatly increasing the uncertainties associated with mathematical models for such parameters. Deterministic interpolators surpassed the stochastic interpolators in parameter estimates that presented strong spatial dependence and associations with lithostratigraphy and geomorphology. This research can contribute to future work on groundwater management and planning in fractured aquifers, since the use of different interpolation and consistency approaches to analyse and compare different hydrogeological parameters in a fractured aquifer system has not been found in the literature.

Biografia do Autor

Thiago DE VARGAS, Instituto de Pesquisas Hidráulicas (UFRGS)

Universidade Federal do Rio Grande do Sul

Instituto de Pesquisas Hidráulicas (UFRGS). Avenida Bento Gonçalves, 9500 - Prédio 44302 - Agronomia, Porto Alegre - RS.
E-mail: tiago.devargas@ufrgs.br

Rossano BELLADONA, Serviço Autônomo Municipal de Água e Esgoto

Serviço Autônomo Municipal de Água e Esgoto (SAMAE),

Rua Nestor Moreira, 719 - Nossa Senhora de Lourdes, Caxias do Sul. RS

Maria Eduarda Ribeiro de SOUZA, Serviço Autônomo Municipal de Água e Esgoto

Serviço Autônomo Municipal de Água e Esgoto (SAMAE),

Rua Nestor Moreira, 719 - Nossa Senhora de Lourdes, Caxias do Sul. RS

Publicado
2022-10-13