Estudo de propagação de ondas para auxiliar a elaboração do plano de ação emergencial externo - PAE

Abstract

This study meets the guidelines of the Act 12.334/2010 of the National Dam Safety and aims to assess the flood waves caused by full flow operation and flow induced by hypothetical dam rupture, for the preparation of an Emergency Action Plan. The study was developed in HPP Tres Irmaos, in Rio Tiete, CESP - Companhia Energetica de Sao Paulo. The flood waves were propagated along a 30 km reach, using the HEC-RAS model, calibrated from the reproduction of historical water levels. The methodology seeks to determine the peak arrival times, period of submersion, water levels and velocities at different points of interest along the river for different scenarios. Flood maps were made to serve as the basis for defining a plan for evacuation of the affected population. The outflow hydrographs generated resulted in peak flows between 20.915 and 40.507 m³/s, with breach opening times between 1 and 14 h. The results showed little influence of the breach opening time in the extent and time of submersion of the affected areas, with only appreciable difference in arrival time of the peak. The simulations in steady and unsteady flow regimes showed no large variations of the maximum water depth. It was observed small attenuation of the max flow rate along the river reach due to the large reservoir storage and the long depletion time. The risk of cascade rupture was not identified, because the downs tream Jupia dam can control flow rates up to 50.000 m³/s