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Les risques hydrologiques d'inondations et la problématique d'aménagement des territoires de piémont : cas du "dir" de Taghzirt à Zaouit Echiekh, Province de Béni Mellal, Maroc

Abstract : One-third of the world's population lives in areas where potential risks are more or less directly related to nature. Floods are responsible for more than half of the damaging risks. Like other countries, the flood risk affects the Moroccan cities and especially those located on the piedmonts. For instance, the agglomerations of Béni Mellal piedmonts are very threatened by floods. These disasters are the result of flash floods originating principally from a changing rainfall pattern (remarkable intensities) and a favorable topography conductive to the concentration of the flows on small watersheds of steep slope.This study is an operational contribution to the knowledge of the "flood-lightning" phenomenon that is affecting the agglomerations of the "piedmont " of Beni-Mellal. Its objective is to identify the resilience of the Atlas “piedmont” of Beni-Mellal in the face of floods and "flash floods".Because of the absence of hydro-rainfall stations, and the specificity of the study area considered as being a transition zone, the approach developed is based on a detailed study taking into account two risk factors, namely the hazard and the vulnerability..Our approach, which can be described as "an integrated hydrological approach" considers the hazard as a hydrological solidarity between upstream and downstream or rather the dependence of downstream towards the upstream. Therefore, risk management in the piedmonts of Béni-Mellalrequires the integration of modeling hydrological techniques and the association of non-structural measures such as, risk awareness, vulnerability reduction, controlof soil occupation, especially urban dynamics. For this reason, the adopted solutions a must be coherent with each other. In this respect, our methodology is based on the valuation of multi-source data. It relie, on one hand, on a classical hydrology approach, which consists of the analytical study of "historical hazard"and the hydrometric study whose hydrometric and rainfall data will be used for the analysis. Characterization of "hazard" and flashfloods events (The results of this modeling hydrological approach will be used for the calibration and validation of hydraulic modeling and for the elaboration of risk maps. On the other hand, it aims at integrating the socio-economic and cultural context, the degree of organization of the occupation of the ground, and the public policies of the risk management ... etc
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https://hal.univ-lorraine.fr/tel-02462221
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Submitted on : Friday, January 31, 2020 - 10:45:41 AM
Last modification on : Monday, October 19, 2020 - 11:10:27 AM
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  • HAL Id : tel-02462221, version 1

Citation

Bouazza Sallak. Les risques hydrologiques d'inondations et la problématique d'aménagement des territoires de piémont : cas du "dir" de Taghzirt à Zaouit Echiekh, Province de Béni Mellal, Maroc. Géographie. Université de Lorraine; Université Sultan Moulay Slimane (Beni Mellal, Maroc), 2019. Français. ⟨NNT : 2019LORR0115⟩. ⟨tel-02462221⟩

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