Manfreda, G.Cavallo, C.Lilli, M. A.Maragkaki, A.Negro, G.Papa, M. M.Nikolaidis, N. P.Vezza, Paolo2026-05-142026-05-142026-06https://riunet.upv.es/handle/10251/235152[EN] Study region: The Keritis Basin is located on the Island of Crete (Greece). Study focus: This study presents a novel methodology integrating satellite imagery and hydrological modeling to provide daily forecasts of flow conditions in two non-perennial reaches of the Keritis River (Greece) during 2019-2023. A Karst-SWAT model was used to estimate daily streamflow and classified Sentinel-2 images were used to derive flow condition (flowing, ponding or dry). The combined dataset enabled the definition of critical thresholds to distinguish transitions from flowing to zero-flow events and between ponding and dry conditions. New hydrological insights for the region: The integrated approach significantly improved the understanding of flow intermittency patterns at the daily scale by quantifying zero-flow events and estimating the hydrotype of the river reaches. Both studied reaches of the Keritis River were classified as Intermittent-Fluent. However, they exhibited pronounced interannual variability, largely driven by hydrological droughts. Water balance analysis indicates that deep aquifer recharge, due to the complex karst system, plays a primary role in controlling the occurrence of annual drying events, while evapotranspiration primarily modulates the frequency and magnitude of zero-flow peaks.Reconocimiento - No comercial (by-nc)Non-perennial riversZero-flow eventsHydrological modelSWATSatellite imagesSentinel-2Artículo10.1016/j.ejrh.2026.103431Abierto2214-581806.- Garantizar la disponibilidad y la gestión sostenible del agua y el saneamiento para todos13.- Tomar medidas urgentes para combatir el cambio climático y sus efectos