Mapeamento geomorfológico do setor franciscano em Alagoas

Abstract

Geomorphological systems help to understand the dynamics of the landscape. Thus, the interaction of processes and forms throughout the geological time makes it possible to understand the relief compartments. In this sense, medium scale mapping is important to understand the evolution of landforms, providing regional analysis with the hierarchization and classification of geomorphological units. Furthermore, it is also relevant for the development of the scientific bias, especially in geographic science, contributing to the basic studies of geomorphology and the management of natural resources, environmental and urban planning. Thus, the present research aims to identify the relief forms in the northeastern region of Brazil, more precisely in the Franciscan sector in Alagoas. Therefore, it aims to understand and delimit the hierarchical levels of morphostructural and morphosculptural features in order to subsequently perform geomorphological modeling. The study area of the lower São Francisco has a semi-arid and humid climate with biomes varying between caatinga and Atlantic forest. It highlights crystalline domains in the higher altitude areas of the state and sedimentary domains near the river mouth. It has the watersheds of the Moxotó, Capiá, Ipanema and Traipu Rivers on the borders of Pernambuco and Alagoas that are born in the geomorphologic region of the Borborema macrodomain, in the structural compartments of the Remobilized Massifs of the Pernambuco-Alagoas Domain, the Ipanema Intraplastic Depression, and the PernambucoAlagoas Structural Summit; and the watersheds of the Talhada, Riacho Grande and Alto Piauí Rivers that are inserted only in the Alagoas territory. The methodology adopted follows the recommendations of the International Association of Geomorphology - IGA through Demek's manuals and the Brazilian Institute of Geography and Statistics - IBGE. Using morphometric parameters that help in greater detail for cartographic scale 1:250,000 and 1:100,000.