Resumen:
The correct management of groundwater depends on information regarding the evolutionary processes of groundwater and the characterization of
spatial variability of recharge mechanisms. GIS-based index models have become a reliable alternative for mapping and interpreting recharge models due
to their adaptability and reliability in estimating recharge. Furthermore, stable isotopes of hydrogen and oxygen in water (δ
2H and δ
18O) help determine
the origin and monitoring of water in the hydrological cycle. This paper aims to contribute to the knowledge of groundwater recharge by developing a
conceptual recharge model using stable isotopes and estimating the recharge amount using a spatially distributed water balance model based on GIS for
the Zamora River Basin (ZRB) in Ecuadorian Amazon. Due to the basin's size and geography, it was necessary to divide it into six precipitation blocks. The
high precipitation rates resulted in high (18.22%) and moderate (30.93%) recharge zones across the basin. The analysis of stable isotopes in water
indicates that precipitation water comes from the east, from the Amazon plain. In the valleys, precipitation enriched in δ
18O suggests that it has
undergone a recycling process in the basin; groundwater recharge comes from these precipitations. This analysis provides a simplified representation of
reality that can assist in predicting the impacts of human activities on the basin.
