Regional Flood Frequency Analysis in Tunisia: Identification of Regional Distributions |
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Authors: | Manel Ellouze Habib Abida |
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Affiliation: | (1) Faculté des Sciences de Sfax, Sfax, Tunisia |
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Abstract: | Best-fit distributions of floods in Tunisia are determined based on L-moment diagram and statistical tests. GEV and GLO distributions
provided the best fit to seven and three regions of Tunisia respectively. In each homogeneous region, hierarchical approaches
and regression models were developed for gauged and ungauged watersheds. The first two parameters of the distributions (GEV
and GLO) were estimated from measured data while the third parameter was represented by the regional average value weighted
by the record length of all stations in the region. The obtained parameters were correlated to the catchment size. Quantiles
obtained by the proposed models were compared with those obtained using local conventional models. Statistical tests showed
that the proposed models provided a much better agreement with observed floods than any of the conventional methods generally
used in Tunisia. |
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Keywords: | " target="_blank"> Flood Frequency analysis Probability distribution Linear moments |
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