The importance of transient flow simulation in the numerical model of the Guarani Aquifer System

A. Gómez; L. Vives; L. Rodríguez; S. D. S. Cota

doi:10.21701/bolgeomin.123.3.005

Authors

A. Gómez Centro de Estudios Hidroambientales, Facultad de Ingeniería y Ciencias Hídricas, Universidad Nacional del Litoral - Consejo Nacional de Investigaciones Científicas y Técnicas
L. Vives Instituto de Hidrología de Llanuras, Universidad Nacional del Centro de la Provincia de Buenos Aires
L. Rodríguez Centro de Estudios Hidroambientales, Facultad de Ingeniería y Ciencias Hídricas
S. D. S. Cota Centro de Desenvolvimento da Tecnologia Nuclear, Comissão Nacional de Energia Nuclear

DOI:

https://doi.org/10.21701/bolgeomin.123.3.005

Keywords:

Guarani Aquifer System, hydrodynamics, numerical simulation, sedimentary basin

Abstract

A regional groundwater flow model under a steady-state regime has been developed within the framework of the Project for the Environmental Protection and Sustainable Development of the Guaraní Aquifer System. The model has allowed the comparison of several plausible hypotheses concerning different conceptual models, mainly with regard to alternative hydraulic conductivity zoning. We assess here the influence of the flow regime, either steady-state or temporal, on the magnitude of hydraulic conductivity and the water balance. The response time to various external stresses is also analyzed. The results indicate that the effect of increasing pumping is immediately noticeable close to pumping wells whilst the effect manifests with a lag time, though less intensively, as the distance from the pumping centre increments. The effect of pumping would be imperceptible 300 km away, at least for the simulated conditions in a 100-year scenario.

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