Impacts hydro-morphosédimentaires du barrage Sidi Chahed et mutation du paysage fluvial de la basse vallée du Mikkès (bassin du Sebou, Maroc)

Abstract

This study examines the hydromorphosedimentary impacts of the Sidi Chahed Dam on the Mikkès River within the Saïs Basin (Sebou Basin, Morocco). Field surveys, sediment sampling, and longitudinal and cross-sectional analyses were used to evaluate variations in flow regime, sediment deposition, and channel morphology. The results indicate that dam retention significantly reduced downstream sediment transport, modified meander geometry, and disrupted natural fluvial dynamics. These changes have led to channel incision and sediment sorting. The findings highlight the effects of hydraulic infrastructure on river systems and provide useful insights for integrated river management in semi-arid environments.