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Communication incl. Poster: BibTeX citation key:  Nicaise
Nicaise, E., Sambou, S. & Tamba, S. 2009. Calibration and validation of the empirical hydrological models GR4J and GR2M on the Gambia basin river upstream to the station of Kedougou: Long-term evolution of water resources. Work presented at Third International AMMA Conference, July 20—24, at Ouagadougou, Burkina Faso.
Added by: roussot 2009-11-22 20:51:19
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Categories: Land surface processes, Water cycle
Keywords: Hydrology, Modelling
Creators: Nicaise, Sambou, Tamba
Publisher: African Monsoon Multidisciplinary Analyses (Ouagadougou, Burkina Faso)
Collection: Third International AMMA Conference

Number of views:  871
Popularity index:  46.08%
Maturity index:  published

 
Abstract
Water resources management and planning, hydraulic structure design, flood forecasting, and also trends in water resources availability requisite hydrological models. Though many approach are used in rainfall runoff models, data used as inputs are often very hard to gather, particularly in Africa, so that empirical conceptual models are generally preferred to physical based ones, highly demanding in data. In this paper, empirical conceptual models, at daily and monthly scale, GR4J and GR2M (CEMAGREF) are calibrated and validated on the Gambian river upstream the gauge station of Kédougou. While GR2M Excel version available on the website of CEMAGREF is enough to give good simulations, Serna coefficients must first be calculated and then used in the model to have reliable simulations for the GR4J model, according to the various Nash related criteria of goodness of fit. Adequate models coefficients for Gambian river at daily and monthly time scale have then been obtained for GR4J and GR2M after a lot of trials. Missing daily flows during a period where rainfall observations are unavailable are restored with the model. In the next step we will use ENSEMBLES outputs to force the model at monthly scale and simulate the trend in water resources for different climate scenario.
Added by: roussot