AnÃlise morfodinÃmica na Reserva EcolÃgica de CamaÃari, Cabo de Santo Agostinho - PE

AUTOR(ES)

Ana FlÃvia de Albuquerque

DATA DE PUBLICAÇÃO

2007

RESUMO

The present work was developed within the environmental impacts perspective, focusing on the continuing process of metropolitan sprawling, and aimed at identifying and analyzing erosive processes found within an officially designated permanent environment protection area. Inside CamaÃari Ecological Reservation, municipality of Cabo de Santo Agostinho, Recife Metropolitan Region, a strong pedogenetic control on erosion was observed, through the degradation of a thick elluvial horizon in sharp contact with the underlying B horizon of clayey texture and blocky structure. In face of the strong textural variation between the horizons, the removal of the vegetation cover favors the occurrence of earthflows in the upper horizon, which slide down from the top of a hill that was chosen as the focus studyarea. Following the above described scenery, this research aimed at understanding the causal relationships that trigger environmental instability events, catalyzed by the removal of the in situ regolith for civil construction. The research still sought to establish initial considerations regarding the recent environmental history of the landscape within the studyarea, based on the analysis of its landforms and superficial cover of young sediments and residual soils. By means of the detailed morphodynamics mapping for the years of 1974 and 1997, it was possible to determine that the diversity of pedological covers in the area, as a dynamic response of the several lithological stocks to the humid tropical climate, commands the distribution of surface processes, favoring the occurrence of mass movements, severe linear erosion, sub-surface water damming and coalescence of alluvial fans. The results of the morphostratigraphical analysis demonstrated that the sandy top horizon that structure the summit of the local hills evolved through the operation of the following mechanisms: geochemical weathering â pedogenetical transformation â surface erosion, in alternating humid and wet/dry tropical conditions. Finally, this research has made it possible to assess the rates of recent geomorphological evolution within this particular landscape, as well define the links between the several morphostratigraphical elements and the erosive agents

ASSUNTO(S)

reserva ecolÃgica de camaÃari geografia camaÃari ecological revervation recife metropolitan region aÃÃo antrÃpica anthropic action morphodynamics morfoestratigrafia regiÃo metropolitana do recife morphostratigraphy morfodinÃmica

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