Analyse et cartographie du risque d'inondation dans la ville de Ghardaïa

Abstract

La ville de Ghardaïa a connu dans son passé plusieurs inondations dévastatrices notamment celle d’Octobre 2008 causant des pertes humaines et matériels considérables. Les causes de ces catastrophes sont diverses mais la cause la plus pertinente est l’urbanisation anarchiques aux bords de l’oued M’Zab. Après cette catastrophe, plusieurs mesures d’atténuation ont été entrepris notamment l’implantation de trois barrages érecteurs l’amont de la ville afin de diminuer les débits lors des crues et éviter ainsi d’autres catastrophes. Le but de notre travail est d’analyser le risque d’inondation à la suite de ces mesures à travers une modélisation hydrologique via HEC-HMS et une modélisation hydraulique via HEC-RAS.

The city of Ghardaïa experienced in the past several devastating floods especially the October 2008 event which caused considerable loss of life and property. The causes of these disasters are diverse but the most relevant cause is the anarchic urbanization at the M'Zab oued flood plains. After the 2008 disaster, several mitigation measures were undertaken including the construction of three erecting dams upstream of the city to reduce flow discharges during floods and avoid other disasters. The purpose of this study is to analyze flood risk after these measurements through hydrological modeling via HEC-HMS and hydraulic modeling via HEC-RAS.

The city of Ghardaïa experienced in the past several devastating floods especially the October 2008 event which caused considerable loss of life and property. The causes of these disasters are diverse but the most relevant cause is the anarchic urbanization at the M'Zab oued flood plains. After the 2008 disaster, several mitigation measures were undertaken including the construction of three erecting dams upstream of the city to reduce flow discharges during floods and avoid other disasters. The purpose of this study is to analyze flood risk after these measurements through hydrological modeling via HEC-HMS and hydraulic modeling via HEC-RAS.