Title: Estimation of extreme floods by regional methods in Trois Rivières watershed - North West Algeria

Authors: Amel Talia; Mohamed Meddi

Addresses: Université Mustapha Stambouli de Mascara, LSTE, BP. 305, Algeria ' Ecole Nationale Supérieure d'Hydraulique de Blida, LGEE, Route de Soumaa, Bp. 31, BLIDA, Algeria

Abstract: The objective of this study is to estimate the extreme floods corresponding to different recurrence intervals in Trois Rivières watershed, a large sub-basin of the Macta basin (NW-Algeria). Two regional models are used flow-duration-frequency (Qdf) modelling and gradex method. A methodology for modelling QdF curves based on the so-called continuous converging model has been applied. The second model is gradex method which is a rainfall-runoff probability approach to computing extreme flood discharges in a river. The QdF model gives a complete description of the flood dynamics of Trois Rivières basin. Nevertheless, it is recommended to use this method with vigilance for the predetermination of severe floods for important return periods. However, the gradex method overestimates the extreme floods for different recurrence intervals. This study highlights that diverse methods should be employed for the regional analysis of extreme hydrological events.

Keywords: floods; QdF modelling; gradex method; Trois Rivières watershed; Algeria.

DOI: 10.1504/IJHST.2020.110565

International Journal of Hydrology Science and Technology, 2020 Vol.10 No.6, pp.527 - 541

Received: 14 Dec 2017
Accepted: 07 Jan 2019
Published online: 26 Oct 2020 *

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