Simulação de ondas de cheia induzidas pelo rompimento hipotético da barragem de Peti em São Gonçalo do Rio Abaixo-MG

Abstract

The rupture of a dam is an occurrence that carries many social, economic and environmental impacts and can be caused by different factors. The simulation of the rupture of this type of structure is necessary, because it is a preventive process in the search of actions to minimize its impacts. This analysis evaluates the possible consequences generated in case of disruption. This study is a hypothetical analysis of the rupture of the Peti dam, belonging to the municipality of São Gonçalo do Rio Below, in Minas Gerais. It is located on the Santa Bárbara River, part of the Rio Doce River Basin. The methodology used was to delimit the hydrographic basin upstream of the dam, to classify the use and the occupation of the soil and also the soil types of each microbasin, using image geoprocessing tools (QGIS) and color image classification (MultiSpec) . Then, the hydrograph of inlet flows of the dam reservoir was determined by means of the HEC-HMS computational program. With these data, it was verified the flood wave that would cause the hypothetical breaking of Peti by the formation of the breach through the computational program HEC-RAS, defining the area reached downstream. The consequences of the simulated disruption were: socioeconomic impacts and the loss of human lives, reaching about 30 thousand people.