What to Expect
She will focus the talk on her current research based on the hydrogeochemical modelling of the Matanza-Riachuelo Aquifer System (MRAS). This aquifer system is localized on the Chaco-Pampean Plain (CPP), Argentina, one of the most extensive loess areas in the world and highly productive in terms of agriculture and livestock. The methodology consisted in: 1) isotopic and chemical identification and characterization of groundwater; 2) identification of the physical and chemical processes driving the groundwater chemical characteristics; 3) development of a hydrochemical conceptual model; 4) validation of the hydrochemical model with hydrogeochemical modelling. The groundwater chemistry consists of three main chemical types with a specific spatial location. Processes occurring during recharge through the unsaturated zone are responsible of the fresh water types, while processes originating brackish and saline groundwater occur at the saturated zone in different zones of the MRAS. The study settles the most relevant hydrogeochemical processes occurring at the MRAS, and provides models than can further be used to: 1) improve the existing understanding on the behavior of contaminants such as As; 2) optimize the basin management and contribute increasing the quality of life of the basin inhabitants.
Sandra Armengol is finishing her PhD at the Large Plains Hydrology Institute in Argentina. She was part of the Groundwater Hydrology Group of Barcelona where she studied the MSc in Geotechnical Engineering Sp. Groundwater Hydrology. There her research focused on applying stochastic methods to vulnerability assessment. Her last research (PhD) is focused on modeling the main process of controlling groundwater chemistry with an emphasis on the role of silicate weathering.