English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

This study assesses incremental benefits that might be obtained from the use of short-term and long-term streamflow forecasts in the operation of a multipurpose reservoir focusing on two water uses: flood control and power generation. The Três Marias dam, in the São Francisco river basin, was selected for study, primarily because of the availability of short-term streamflow forecast data from previous work. This streamflow forecast was estimated with a distributed hydrological model that uses a combination of observed precipitation and quantitative precipitation forecast generated by an ETA regional model as input data, and it will here be referred to as real short-term forecast. In order to quantify the benefits of forecasts, two simulation models of reservoir operation were used. The first model defines reservoir operation without using forecasts. Meanwhile, the second model considers available forecasts in the reservoir operation. The time step used in simulation was one day. Operation rules, in the form of linear rulecurves were used in reservoir operation with and without forecast. The rule-curves were optimized through a parameterization, simulation and optimization approach with an evolutionary algorithm. Results with “perfect” forecasts (considering observed flows as a forecast) show that an 8% improvement in hydropower generation can occur if longterm forecasts are considered with a two-month horizon, and if the operation is set very early in advance. The operation based on short-term forecasts has less benefits, but they are still significant. For instance, a short-term forecast with a 12-day lead time performed weekly has an incremental hydropower generation of 4.45%. Those benefits were achieved without loss of flood control performance. The benefits achieved with real short-term forecasts were lower than those with perfect short-term forecasts, as expected. However, benefits were still achieved with the real shortterm forecasts, that could be 50% higher than those expected with the perfect flow forecasts and, consequently, the reduction of increased benefit is relatively small in the period analyzed. Results are promising and show clear advantages in using quantitative precipitation forecasts to perform streamflow forecasts in multipurpose reservoir

Avaliação dos Benefícios de Previsões de Vazão na Operação de Reservatórios