Levantamento de uso e conflitos da terra da área de captação da barragem do DNOS na área de proteção ambiental (APA) no Rio Vacacaí-Mirim/RS

Abstract

This paper aimed basically at making the land use mapping regarding the capture area of DNOS barrage in the Environmental Protection Area (EPA) of the River Vacacaí-Mirim/ RS, in order to evaluate the environmental conditions of the Conservation Unit of Sustainable Use located between Santa Maria and Itaara municipalities, RS, where the land use digital classification was made. By means of applied methodology, the data concerning the land use, altimetry and declivities levels, was obtained. Through 4,2 SPRING program, it was generated: (i) the land use map, where the following was quantified: Arboreous Vegetation (1350,24ha), Shrubby Vegetation (775,16 ha), Field (23,97 ha), Agriculture (144,96 ha), Built Areas (211,90 ha) and Water Channel (69,44 ha); (ii) the environmental legislation map, according to the Federal Forest Code, getting the following data: Protection along the rivers edges (299,16 ha), declivity higher than 47% (257,28 ha), 50m radius sources (25,12ha); (iii) in the following stage, the data of the land use were crossed with the forest legislation data, and it was obtained 130,98 ha; (iv) finally, through the acquired data and the information plans crossing, the adequate land use map was determined based on Libault's methodology (1971). As final results, it has been obtained: 480,82 hectares as permanent preservation area; 560,77 hectares of permanent conservation areas; 1828,16 hectares of use and occupation areas, and 130,98 hectares of restoration areas.