Avaliação de alterações nos volumes de espera do reservatório Pedra do Cavalo em evento hidrológico extremo sob aspecto da segurança do vale a jusante

Abstract

Many authors have been addressing the damage that can occur downstream in case of dam rupture (structural integrity), to the detriment of the downstream valley safety approach in case of alteration or impairment of its operational integrity. Thus, understanding the impact of reservoir operation during critical periods of flooding becomes essential. With the objective of evaluating the potential damages to human lives associated to different scenarios of operation of the reservoir downstream of the Pedra no Cavalo - BA bus, the 1989 flood event was studied, adopting the following methodology: simulation of 3 scenarios of reservoir operation in the WEAP flow network model, simulation of the defluent flows in the HEC RAS ​​software and evaluation of potential damage of loss of human lives, according to methodologies adopted for cases of dam ruptures. The scenarios consider waiting volumes associated with downstream valley protection for floods with recurrence times of 30, 20 and 15 years. The reduction in the waiting volume considered in the scenarios did not show any difference in the damages associated with the loss of downstream human lives. However, it has been observed that in all scenarios the danger to humans was high, and that the arrival time of the flood wave at the flood sites is less than 30 minutes, corresponding to a self-rescue zone.