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Institut Polytechnique Saint Louis (IPSL) 2013

Application of a 1-D hydrodynamic model for flood protection from a torrential river in semi-arid environments : a case study of the Gash River in eastern Sudan

CHALNOT, Marine

Titre : Application of a 1-D hydrodynamic model for flood protection from a torrential river in semi-arid environments : a case study of the Gash River in eastern Sudan

Auteur : CHALNOT, Marine

Etablissement de soutenance : Institut Polytechnique Saint Louis (IPSL)

Grade : Ingénieur ISTOM 2013

Résumé
Historically, floods are the most common environmental hazard worldwide and also one of the most threatening to human society. The Gash River is unique in that it flows torrentially between July and October whilst the rest of the year it is dry. Despite this characteristic, the river is the main source of water for domestic water and agricultural supply for Kassala city. A hydrodynamic model, HEC-RAS was made to evaluate the existing protection structures of Kassala through two simulations in steady and unsteady state. These simulations support the conclusions that the existing protection structures are effective at 76% for a flow rate of 700m3/s which is the most common according to historical data. The effectiveness of the existing protection structure fall to 51% for significant flows as 1000m3/s (in 2009 for example) and 34% for a flow of 1500m3/s (in 2007). Finally, this thesis put in evidence two critical zones where the flood risk is more important. In these areas, the large amount of sediments and depots and erosion need extensive monitoring and to strengthen and increase the size of the river bank to protect effectively the city. The limitations of the model and the HEC-RAS software discovered during this study have been acknowledged in several recommendations. This thesis is part of a modelling project which will cover the entire Gash River to understand the extreme flows and mitigate the effect of the floods from a torrential river in semi-arid environments

Mots clés : ANALYSE HYDRODYNAMIQUE / HYDRAULIQUE TORRENTIELLE / SOUDAN / ZONE SEMIARIDE

Présentation (ISTOM)

Page publiée le 12 mai 2017, mise à jour le 29 septembre 2019