Articles | Volume 20, issue 7
https://doi.org/10.5194/hess-20-2841-2016
© Author(s) 2016. This work is distributed under
the Creative Commons Attribution 3.0 License.
the Creative Commons Attribution 3.0 License.
https://doi.org/10.5194/hess-20-2841-2016
© Author(s) 2016. This work is distributed under
the Creative Commons Attribution 3.0 License.
the Creative Commons Attribution 3.0 License.
Research article
| 
15 Jul 2016
Research article |
| 15 Jul 2016
Model-based study of the role of rainfall and land use–land cover in the changes in the occurrence and intensity of Niger red floods in Niamey between 1953 and 2012
Claire Casse
CORRESPONDING AUTHOR
Géoscience Environnement Toulouse (UMR5563 CNRS, IRD,
Université Toulouse III), Observatoire Midi-Pyrénées, Toulouse,
France
Géoscience Environnement Toulouse (UMR5563 CNRS, IRD,
Université Toulouse III), Observatoire Midi-Pyrénées, Toulouse,
France
Théo Vischel
Laboratoire des Transferts en Hydrologie et Environnement
(UMR5564, CNRS, IRD, Université Grenoble I), France
Guillaume Quantin
Laboratoire des Transferts en Hydrologie et Environnement
(UMR5564, CNRS, IRD, Université Grenoble I), France
Bachir Alkali Tanimoun
Autorité du Bassin du Niger (ABN), Niamey,
Niger
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Gabrielle Sorini, Juliette Blanchet, Gérémy Panthou, Théo Vischel, and Yves Tramblay
EGUsphere, https://doi.org/10.5194/egusphere-2026-1176, https://doi.org/10.5194/egusphere-2026-1176, 2026
This preprint is open for discussion and under review for Hydrology and Earth System Sciences (HESS).
Short summary
Short summary
This study investigates regional flood trends across West Africa using time-varying extreme-value distributions. While most catchments show declining flood magnitudes up to the 1970s–1990s, recent trends diverge, ranging from decrease to intensification, revealing an original typology of regional hydrosystems. These results refine the narrative of hydrological changes in West Africa and provide clues to their attribution.
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Short summary
Since 1950, the Niger River basin has overcome drastic changes. In Niamey city, the highest river levels and the longest flooded period ever recorded occurred in 2003, 2010, 2012 and 2013, with heavy casualties and property damage. The reasons for these changes, and the relative role of climate versus Land Use Land Cover changes are still debated and are investigated in this paper using observations and modelling. We conclude on the successive role of cover and then rainfall variability.
Since 1950, the Niger River basin has overcome drastic changes. In Niamey city, the highest...
