Abstract
The present study has analyzed a semi-arid s uvial system and its physical attributes, focusing on resulting geomorphological processes and forms, as well as on their relationship with human activity as a tool for local planning. The research was carried out in the municipality of Belem do Sao Francisco, Pernambuco State, Sao Francisco region, in the watershed of Mulungu creek, an area which is subjected to a semi-arid climate with summer downpours, with a land cover dominated by open thorn-brush vegetation. The methodology applied was the conduction of geomorphological mapping within several scales, emphasizing different land surface aspects, aimed at assessing the hierarchic relationships amongst landforms, geologic basement, and land use typologies. Based on the acquired spatial information in different detailing mapping levels of the s uvial system, it was possible to carry on an environmental assessment of the area, based on the erosive/ depositional dynamics along the channel as well as its relation with its margins. The study concluded that accumulation forms within the s uvial realm exhibit man-induced controls, related to the traditional types of land use within the watershed. Controls, such as the building of dams along the channel, act modifying processes and creating new depositional features in the s uvial system, which at last contribute to reshape land use practices in the area.
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