VALIDACION Y AJUSTE DEL MODELO HIDROGEOLOGICO CONCEPTUAL DE UN HUMEDAL DE LA LLANURA PAMPEANA PCIA DE BS AS ARGENTINA

BERNAVA, GUSTAVO VICENTE; ROMANELLI ASUNCION; MASSONE HECTOR; QUIROZ LONDOÑO ; ESCALANTE ALICIA HAYDEE

LIMNETICA

ASOC ESPAN LIMNOL-MISLATA

Año: 2022

0213-8409

when planning the rational use of the hydric resource. The aim of the present paper is to validate and adjustthe conceptual hydrogeological model for a wetland of the Buenos Aires Pampa Plain through hydrochemical and isotopictechniques. La Brava Wetland Basin (53.6 km2) has been selected. La Brava is a shallow and permanent wetland with an areaof 4.0 km2 and a maximum depth of 4.57 m. Samples for physicochemical and isotopic analyses were taken from groundwater,the wetland, and in the inow and outow streams. A regular grid was designed for the wetland sampling to measure in situ themain physical and chemical parameters at 5 different depths. The chemical composition of the water in the basin is of sodiumbicarbonate type. Hydrochemical and isotopic data allowed the conrmation of the efuent-inuent behavior of this wetland.Electrical conductivity analysis in the wetland at different depths shows a possible preferential recharge zone in the contactof the wetland with La Brava Hill, where an important decrease in this parameter was detected. The information obtainedindicates that the recharge to the aquifer is inuenced by: the rainfall, the wetland discharge, the concentration of surfacerun-off from the range fringes to inter-range depressions and water input from the fault system present in the quartzites.EN ESTE ARTICULO SE ME AGRADECE LA COLABORACION