MAPEAMENTO DE DECLIVIDADE E DAS TIPOLOGIAS DE USO DA TERRA COMO SUBISIDIO AO ZONEAMENTO AMBIENTAL DE UM SEGMENTO DO MÉDIO CURSO DA BACIA HIDROGRÁFICA DO RIO PACOTI-CE./ URBAN WHATERSHEDS: WATER QUALITY AND ENVIRONMENTAL CONFLICTS IN THE CITY OF ILHÉUS – BA

Abstract

This article deals with a proposal of environmental zoning developed for a segment of the middle course of the river basin of the river Pacoti, based on the slope map and the temporal dynamics of land use in 1998 and 2010. From a methodological point of view, resorted to the use of SRTM images for the preparation of the slope map and satellite images for mapping land use in the years in question, as well as the use of GIS software. The results evidenced five slope classes whose characteristics show the different geomorphological conditions of the basin. Regarding the use of the land, it was observed between 1998 and 2010 a significant increase in urban areas, agriculture and exposed soil, as well as the emergence of two new classes of use associated with the industry and mining. The interpretation of land use maps showed that over 20 years, this sector of the basin of Pacoti River has undergone significant environmental change, the result of action of various agents that use natural resources that end up generating a chain of impacts negative. The final step includes the proposed zoning, whose classes are identified the area of permanent preservation, the area of environmental preservation, environmental recovery area and the disciplined use zone, covering the different environmental conditions of the basin. Finally, it is expected that this study may support the decision-making that concern the public policies aimed at environmental planning area. .

Keywords

• Slope; land use; environmental zoning