Avaliação da aplicação e desempenho dos softwares HECHMS e HEC-ResSim em tomada de decisão para controle de reservatórios: caso da operação conjunta de Foz do Areia e Segredo

Abstract

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.