Analyse spatiotemporelle de la dynamique fluviale d’un cours d’eau sahélo-soudanien entre 1967 et 2007. Le cas du Yamé au pays Dogon (Mali, Afrique de l’Ouest)

Abstract :

In West Africa, studies on fluvial systems dynamics are rare and mainly conducted at the small scale to highlight the role of the climatic changes as single driver. This study aims to analyse the recent fluvial system dynamics of the small catchment (4400km²) of the Yamé river (Pays Dogon, Mali). To characterize the current fluvial pattern and to quantify the morphological adjustments of the river between 1967 and 2007 (period which was intercepted by dry years in the Sahel), we propose a reproducible methodology using a semi-automatic diachronic analysis. This methodology is based on a typology of fluvial styles derived from the division of the valley floor into homogeneous sections and the calculation of morphological variables and indices. This study shows : (1) for the current period, a longitudinal diversity of the river system and (2) for the past decades, a heterogeneous response of the watershed according to a change of forcing: climatic (drought) and anthropogenic (demographic pressure ... ).

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Journal articles
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https://hal.archives-ouvertes.fr/hal-01200578
Contributor : Okina Université d'Angers <>
Submitted on : Wednesday, September 16, 2015 - 4:34:13 PM
Last modification on : Friday, October 4, 2019 - 1:37:23 AM

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Aline Garnier, Simon Dufour, Laurent Lespez, Sébastien Caillault, Daniel Delahaye. Analyse spatiotemporelle de la dynamique fluviale d’un cours d’eau sahélo-soudanien entre 1967 et 2007. Le cas du Yamé au pays Dogon (Mali, Afrique de l’Ouest). Revue Internationale de Géomatique, Lavoisier, 2014, 24 (3), pp.279-306. ⟨10.3166/rig.24.279-306⟩. ⟨hal-01200578⟩

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