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Communication incl. Poster: BibTeX citation key:  Seguis
Séguis, L., Kamagaté, B., Montpellier, V., Seidel, J.-L., Akpo, A., Peugeot, C. & Tillery, S. 2009. Streamflow components at the flood scale on a Sudanian catchment: comparison with hydrologic model simulations. Work presented at Third International AMMA Conference, July 20—24, at Ouagadougou, Burkina Faso.
Added by: roussot 2009-10-19 14:27:15    Last Edited by: roussot 2009-10-19 14:51:15
Categories: Land surface processes, Water cycle
Keywords: Hydrology, Water - Energy - Resources
Creators: Akpo, Kamagaté, Montpellier, Peugeot, Séguis, Seidel, Tillery
Publisher: African Monsoon Multidisciplinary Analyses (Ouagadougou, Burkina Faso)
Collection: Third International AMMA Conference

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In sub-humid Sudanian regions, streamflow can be composed by a mixing of Hortonian runoff, saturated area runoff and drainage from shallow to deep groundwaters. In the Donga catchment (586 km²) located in the Upper Oueme observatory (Benin), long term hydrogram decompositions, based on electrical conductivity parameter, have shown that at seasonal scale, drainage of shallow groundwaters (subsurface flow) is the main streamflow contributor. At the event scale, a floods set has been sampled to follow major ions, trace elements and silicon behaviour. With an end member mixing analysis approach, partition between runoff and subsurface flow is evaluated. At the flood scale, runoff is the dominant water source for streamflow. TOPAMMA hydrological model is also able to calculate these two components of streamflow. A comparison is undertaken all over the Donga catchment. This study participates to the evaluation of a reliable representation of the surface water cycle in hydrological modelling.
Added by: roussot    Last Edited by: roussot