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Regional Flood Frequency Analysis in Tunisia: Identification of Regional Distributions

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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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Authors and Affiliations

  1. Faculté des Sciences de Sfax, Sfax, Tunisia

    Manel Ellouze & Habib Abida

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  1. Manel Ellouze
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  2. Habib Abida
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Correspondence to Habib Abida.

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Ellouze, M., Abida, H. Regional Flood Frequency Analysis in Tunisia: Identification of Regional Distributions. Water Resour Manage 22, 943–957 (2008). https://doi.org/10.1007/s11269-007-9203-y

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