The transformation of Sepetiba's Port in a "Hub Port" has been motivating controversies one of which says respect to the environmental impacts in an area already intensely degraded.

This paper is focused in the area of influence of Sepetiba's Port that includes part of the basin of the Sepetiba's Bay. The basin was defined as the basic dynamic unit, whose functionality is fundamental to understand the dynamics of the integrands subsystems which are: Serra do Mar and Massifs of Pedra Branca e Gericinó-Mendanha, the coastal plain and the Sepetiba's Bay, located in the West Zone of the municipal district of Rio de Janeiro and Itaguaí.

For the study of coastal plain and of the massifs the methodology was based in the soil, used as a space unity of analysis since is correlates physical and social aspects.

By comparing this information, through GIS, use and occupation incompatibilities were determinated, as well as spatial and temporally evaluations of the urban-industrial expansion process, the degradation and loss of agricultural areas, the degradation and the extinction of ecosystems, and respective impacts on the quality of the local communities' life. The final results were the generation of maps of the soil, and its respective incompatibilities, serving as base for planning guidelines.

Starting from the verification of important changes in the coastal features the authors analysed models of evaluation and hydrodynamics in the bay, considering the need of understanding the connections between these processes and the human interference's in the subsystems of the Sepetiba's Bay. The results obtained are important to "trace" guidelines of environmental management and space reorganisation with the main objective of re-establishing the landscape, which was recently identified as an important fishing and tourist zone. In this way, this will guarantee the maintenance of the traditional economic activities of the local communities.