Enhancing groundwater representation in SWAT+gwflow with an open-source zonal parameterization and calibration workflow in R. - José Manuel Rodríguez-Castellanos; Ryan T. Bailey; Miguel Martín-Loeches; Silvia Martínez-Pérez; Alejandro Sánchez-Gómez; Eugenio Molina-Navarro (Environ. Model. Softw., 2026)