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Cape Verde Islands are an example of a local diversity of the semi-arid equatorial climate zone. The type and intensity of the present-day morphogenetic processes is determined mostly by total precipitation and vegetation cover. We can distinguish three types of relief development. In the warm, arid climate conditions throughout the year, volcanic forms are very slowly changed or preserved by the action of episodic water, limited to a material redeposition in the wadi channels and sand dune forming by the wind. In the semi-arid climate conditions, volcanic forms are transformed into denudation-fluvial relief in the rain period. It is visible mainly on the windward side of islands and at a lower altitude, where the weathering material is washed from slopes and carried away down the wadi channels to the sea after periodic torrential rains. At the same time on the leeward side, at a higher altitude and in agricultural areas only a small amount of material is transported over short distance.
The paper describes the results of research in the Upper Dades Valley in the High Atlas Mountains in Morocco. The purpose of the research was to identify the impact of river channels changes, fluvial accumulation nad erosion on human activity. Fieldwork and maps were used to characterize the structure of the Dades river channel and the intensity of present-day fluvial processes. Research data show that the Upper Dades Valley is shaped primarily by short but frequent and intense hydrometeorological events. The structure of the Dades river channel indicates a complex functionality. Tributary episodic riviers and gorges sections supply most of the weathering material. Narrow sections of Dades channel serve for material as transfer zones, while deposition occurs across broader areas. Research has shown that extreme fluvial processes occurring in semi-arid mountains result in fast river chanels changes and accelerated deposition of weathering material across valley floors, which usually leads to limits on the development of agriculture in such areas.
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