Zero-flow and hydrotype estimation with karst-SWAT and Sentinel-2 data in the Keritis Basin, Crete
[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) durin...
| Autores: | , , , , , , , |
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| Tipo de recurso: | artículo |
| Fecha de publicación: | 2026 |
| País: | España |
| Institución: | Universitat Politècnica de València (UPV) |
| Repositorio: | RiuNet. Repositorio Institucional de la Universitat Politécnica de Valéncia |
| Idioma: | inglés |
| OAI Identifier: | oai:dnet:riunet______::65730d85a2bb15c4b0f41b246aefd5e2 |
| Acceso en línea: | https://riunet.upv.es/handle/10251/235152 |
| Access Level: | acceso abierto |
| Palabra clave: | Non-perennial rivers Zero-flow events Hydrological model SWAT Satellite images Sentinel-2 06.- Garantizar la disponibilidad y la gestión sostenible del agua y el saneamiento para todos 13.- Tomar medidas urgentes para combatir el cambio climático y sus efectos |
| Sumario: | [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. |
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