Resumo:
System Operator (ONS), there are 161 hydroelectric plants distributed across the
national territory. Of these, 89 are run-of-river plants and 62 have storage capacity (ONS,
2025b). The management of these reservoirs is, for the most part, aimed at meeting the energy
demand of the National Interconnected System (SIN), while also considering certain
restrictions, such as maintaining downstream river levels or the reservoir depletion rate.
However, at specific times, reservoir management shifts to flood control mode, which
prioritizes the safety of the dam and the surrounding area. Each facility has its own operating
rules, developed according to project characteristics, existing hydraulic constraints, and
regional climate conditions. In this context, this research aims to contribute to the operation of
the National Interconnected System (SIN) by applying the hydraulic operation simulation
software HEC-ResSim, developed by the Hydrologic Engineering Center (HEC) of the U.S.
Army Corps of Engineers (USACE), coupled with the hydrological model HEC-HMS, also
developed by the same institution. The focus is on the joint operation of the Foz do Areia and
Segredo reservoirs, located on the Iguaçu River in the state of Paraná. This region is known for
severe weather events at any time of the year, due to the variability of meteorological and terrain
characteristics. The hydrological model was calibrated and validated for the most significant
events throughout the operational period of the Foz do Areia and Segredo reservoirs, thus
enabling the generation of hydrographs for different return periods. These hydrographs were
then inserted into HEC-ResSim to evaluate its performance under existing operational
restrictions. The results demonstrate robustness in the simulations carried out with the coupling
of the two software tools.
