Analysis of the environmental fragility of the hydrographic basin upstream of the reservoir Ernestina/RS

Abstract

The Brazilian energy matrix is dependent on hydroelectric projects that are characterized as activities of high environmental impact. However, such uses are also subject to surrounding impacts that may reduce their potential for power generation. In this sense, the present study aimed to analyze the environmental fragility of the reservoir of the Ernestina / RS Hydroelectric Power Plant. For this, a conceptual map was elaborated related to the fragility of the lake, and the variable variables of the object of study. Of these, five were selected based on their relevance, availability and data quality. For each variable a map was drawn, and scores and weights were assigned. Algebra was then performed by ArcGIS 10.3® Software (ESRI), with equal scores being assigned to all variables. As a result, the map of environmental fragility was obtained, whereby it was found that the study area can be classified, predominantly, as medium fragility. Another relevant aspect is that the zone of very high fragility was basically restricted to the surroundings of the reservoir of Ernestina. Thus, it is confirmed that the study of environmental fragilities can be considered as a timely tool for diagnosis of disturbances both for the enterprise and for the municipalities involved through the planning and management of this area.

Keywords

• Mapa conceitual, Reservatório, Uso da terra, Fragilidade ambiental