Modelling of the runoff–rainfall relationship by duration of rainy episode in a northern Tunisian basin
2010
Mathlouthi, Majid | Lebdi, Fethi
A global hydrological model was calibrated by rainfall events of varying duration (from 1 to 10 days). The events considered were those separated by at least one non-rainy day on each side, and not causing reservoir spillage. The input of this model includes mean rainfall over the catchment, and the Kohler & Linsley antecedent precipitation index. The expressions of the hydrological model for the beginning and the middle of wet season, according to a threshold of the cumulative rainfall since the start of the rainy season, are in a polynomial nonlinear form of the second order. This model proved to be capable of estimating runoff correctly, in spite of the small number of raingauges (one) for the catchment size of 48 km2. The absence of other rainfall stations over the catchment area did not allow the accuracy of the model to be studied by assessing mean rainfall over the catchment rather than the rainfall at the single site of Ghézala Dam.
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