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1 2022

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Digital Elevation Model-Derived Morphometric Indices for Physical Characterization of the Issen Basin (Western High Atlas of Morocco)

Ait Haddou Mohamed, Wanaim Abderrahmane, Ikirri Mustapha, Aydda Ali, Bouchriti Youssef, Abioui Mohamed, Kabbachi Belkacem

Ecological Engineering & Environmental Technology

2022

Vol. 23, iss. 5

285--298

This study attempts to describe the physical characteristics of the Issen basin (western High Atlas of Morocco) in order to highlight the factors affecting water flow and volume that may increase water erosion risk. By using ALOS-DEM of moderate spatial resolution (12.5 m) and GIS platform, it was possible to provide a joint set of morphometric indices of the study area. The obtained results reveal that the relief of the study basin is of mountainous symptom indicating its maturity. The contrasting topography (625 m to 3528 m), with a specific unevenness of the order of 612 m, highlights a strong relief. 94% of the watershed area has a slope of over 3%. The mean elongation of the basin is 1.74, with a fairly long water concentration time of about 7.5 hours and an average drainage density of 0.85 km-1. The tectonics, lithology, and external geodynamics characterstics indicate a strongly contrasted morphology characterizing the Issen basin. Overall, these morphometric characteristics can increase the shallow water flows and sediments mobilized by the Issen Wadi, which can increase the soil loss and flooding risks in the basin.