Identifying and quantifying geochemical and mixing processes in the Matanza-Riachuelo Aquifer System, Argentina

The Science of the Total Environment
S ArmengolS Martínez

Abstract

The Matanza-Riachuelo River Basin, in the Northeast of the Buenos Aires Province, is one of the most industrialized and populated region in Argentina and it is worldwide known for its alarming environmental degradation. In order to prevent further damages, the aquifer system, which consists of two overlaid aquifers, is being monitored from 2008 by the river basin authority, Autoridad de la Cuenca Matanza-Riachuelo. The groundwater chemical baseline has been established in a previous paper (Zabala et al., 2016), and this one is devoted to the identification of the main physical and hydrogeochemical processes that control groundwater chemistry and its areal distribution. Thirty five representative groundwater samples from the Upper Aquifer and thirty four from the deep Puelche Aquifer have been studied with a multi-tool approach to understand the origin of their chemical and isotopic values. The resulting conceptual model has been validated though hydrogeochemical modeling. Most of the aquifer system has fresh groundwater, but some areas have brackish and salt groundwater. Water recharging the Upper Aquifer is of the Ca-HCO3type as a result of soil CO2and carbonate dissolution. Evapotranspiration plays a great role concentrating ...Continue Reading

Citations

Aug 21, 2020·Environmental Science and Pollution Research International·Chengcheng LiJochen Bundschuh
Dec 2, 2020·The Science of the Total Environment·M E ZabalaE Ceballos
Aug 28, 2021·EcoHealth·María Victoria VadellMaría Victoria Cardo

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