EGU General Assembly 2022
© Author(s) 2022. This work is distributed under
the Creative Commons Attribution 4.0 License.

Climate change induced impacts on hydrological extremes at the catchment scale: case of Wadi Siliana (North western Tunisia)

Imen EL Ghoul1,2, Fatma Tliha2, Haykel Sellami3, Kaoutar Mounir4,5, Slaheddine Khlifi1, and Marnik Vanclooster2
Imen EL Ghoul et al.
  • 1UR-Gestion Durable des Ressources en Eau et en Sol, Ecole Supérieure des Ingénieurs de Medjez El Bab, Université de Jendouba,Tunisia (
  • 2Université catholique de Louvain, Earth and Life Institute (ELI), Louvain-la-Neuve, Belgium (
  • 3Centre for water Research and Technology Laboratory of Georesources, Tunisia (
  • 4University François Rabelais of Tours, UMR CNRS 7324 Citeres, 33 allée Ferdinard de Lesseps, B.P. 60449, 37204 Tours cedex 3, France.
  • 5University Sidi Mohamed Ben Abdallah of Fez, CED ST LGE2D, Fez,

High and low flows are hydrological flow extremes threatening human being by causing floods and droughts. They are caused by meteorological extremes and human activities.  Changes in meteorological conditions will inevitably impact the frequency of hydrological extremes and exacerbate their associated hydrological impacts.

This study focuses on modelling projected change in both frequency and magnitude of flow extremes as consequence to change in climate condition in the Siliana catchment in Tunisia. The SWAT and HBV hydrological models were calibrated using historical data and fed with an ensemble of high resolution CORDEX climate models. Results project a warmer and drier hydrometeorological conditions in the Siliana catchment. The precipitation is expected to decrease in the future by an average of 10% in dry season and 12% in wet season. In contrast, temperature is expected to increase by an average of +2°C in dry season and 1.8°C in wet period.

The two models show that while magnitude and frequency of high flows are expected to decrease, low flows frequency is expected to increase which affirms that the Siliana catchment is likely to experience severe hydrological conditions with reduction in water availability and increase in drought frequency.

How to cite: EL Ghoul, I., Tliha, F., Sellami, H., Mounir, K., Khlifi, S., and Vanclooster, M.: Climate change induced impacts on hydrological extremes at the catchment scale: case of Wadi Siliana (North western Tunisia), EGU General Assembly 2022, Vienna, Austria, 23–27 May 2022, EGU22-8676,, 2022.


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