Variação espaço-temporal da expansão urbana e da rede de drenagem da Bacia do Igarapé Grande na cidade de Boa Vista, Roraima

AUTOR(ES)
DATA DE PUBLICAÇÃO

2010

RESUMO

This study objectified the evaluation of the variation space-weather of urban expansion and of the net drainage of the basin of the narrow river Grande as a preponderant factor for the significant advance in the alteration of the natural draining of the water, whose consequence is sufficiently drastic in relation to the preservation of the environment. To carry out this research they were required the site of the INPE, the images TM/LANDSAT-5 of the years of, 1985, 1990, 1995, 2000, 2004 and 2009. The results had signaled for the speed up process of urban expansion and the inadequate use of the ground. The alterations in the basin of the narrow river Grande can be evaluated in two levels, first, because of the indirect influence and second, in virtue of the execution of direct alterations of the canals. The speed up process of expansion of the city of Boa Vista caused the following alterations: the withdrawal of the primitive vegetation and the water protection of the soil, covering up the area of natural springs and stopping the water drainage at head of the river, for the construction of housings and roads, construction of houses in the bed of the canals and constructing canals for pluvial drainage

ASSUNTO(S)

amazônia igarapé grande bacias hidrográficas ciencias biologicas urbanization environmental impacts hydrographic basin igarape (small stream) grande amazon roraima river river roraima drenagem drainage impactos ambientais, urbanização

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