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Comunicaciones a congresos internacionales

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Navegando Comunicaciones a congresos internacionales por Autor "Guizzardi, S."

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  • Miniatura
    ÍtemAcceso Abierto
    Forecast system implementation in the Paraná Delta
    (2022-06) Guizzardi, S.; Bianchi, J.; Cortese, J.; Uriburu Quirno, M.; Sabarots Gerbec, M.
    The hydrodynamics of the Paraná Delta is highly conditioned by the interaction of the Paraná River discharge and the tidal regime of the Río de la Plata estuary. In 2020 and 2021, the Paraná River observed one of its most significant low-flow periods in its historical record. The observed low-flows are having a significant impact on water intakes and the navigability of the waterway. A forecasting system has been implemented to predict water levels in different cross sections at two different lead times, i.e., 4 and 15 days, corresponding to different meteorological tide inputs. The 4-day forecast model performance was assessed between 12/08/2021 and 25/1/2022 by means of the following metrics: mean absolute error (MAE), standard error (SE), and Pearson correlation coefficient (PCC), computed on modeled and observed series. The evaluation of these forecasts during 5 months show that its performance is satisfactory. The comparison between the time series of observed and simulated water levels shows that there is a good representation of the main trends, not only in time of happening but also in the magnitude of the events. This tool has had a significant impact among users in the region in terms of its outreach, as shown by the large number of website visits to the published forecasts.
  • Miniatura
    ÍtemAcceso Abierto
    Hydrodynamic optimization of a large pumping station with complex geometry
    (2022-06) Sabarots Gerbec, M.; Guizzardi, S.
    The present work is focused on the study and optimization of the Inlet Pumping Station (IPS) at the Riachuelo System, designed for a 27 m3/s discharge, with six (out of 8) operative pumps, and a total power of 25MW. The approach to the study is undertaken by joint numerical and physical modelling. The first is implemented to carry out a preliminary diagnosis of key hydrodynamic aspects and to develop an efficient evaluation of alternatives for the final optimization. The physical modelling is used in parallel to analyze the optimized geometry and to perform a vast range of simulations for different operation scenarios. A numerical model developed using Computation Fluid Dynamics (CFD) was implemented to diagnose the hydrodynamic behavior of the IPS project under critical scenarios, where high concentrated streams, submerged or surface vortices, flow swirls entering the pump and non-uniform velocity distribution must be limited to achieve an optimal hydraulic performance. In addition to velocity fields post processed from CFD simulations, vortex core line detection algorithm and swirl angel (SA) were computed to identify undesired hydraulic phenomena. Ratios between SA and vortex detection indicators such as Lambda-2, Q criterion and Helicity, were obtained. The geometry was primarily optimized to reduce potential sedimentation effects and to limit the swirl angle. Although the swirl angle was reduced by 50% in the optimization process, in 2 suction pipes it results in approximately 8.5º, which is higher than the 7º admissible short-term swirl angle. The swirl angle measured in the physical model was consistently lower than the computed from CFD simulations.