Aplicação do índice de concentração de rugosidade (ICR) para avaliação da mancha de inundação da barragem Vargem Grande em Nova Lima (MG)

Abstract

Flood zones are fundamental representations contained in Emergency Action Plans for Mining Dams (PAEBM), which are downstream flow distribution schemes in hypothetical cases of these structures' failure. As it involves flow modeling and interactions with the landscape, topographic components are associated with its elaboration. Therefore, there is a morphometric importance in the estimation of flooded areas, which includes, for example, the quantification of slope, mapped both in a simplified way and through specific software for hydrodynamics. Given the regulations and revisions of legislation on dams and considering the traditional mining vocation of the state of Minas Gerais, as well as the known damages caused by ruptures such as those in Fundão (2015, in Mariana) and Córrego do Feijão (2019, in Brumadinho), this research aimed to evaluate the treatment of the relationship between a flood zone and the geomorphological adherence of this estimation. For this, a survey of high-risk and high-Potential Damage Associated (DPA) dams was conducted, and the Zone of Self-Salvage (ZAS) of the Vargem Grande Dam (Vale S.A.), in Nova Lima - MG, was taken as a case study to evaluate it with the response of the Rugosity Concentration Index (ICR), in order to understand and discuss the passage surfaces by the propagation of this zone and its relationships with portions with greater or lesser dissection with information contained in the PAEBM referring to the potential population affected in case of rupture. The ICR proved to be effective in both analyses.