In this issue of RIBAGUA, three studies are presented, focusing on streamflow prediction, the effects of dredging on river corridors, and the management of navigation in a seaport.

The first article summarises the effects of dredging in the Paraguay River on the Pantanal system in Mato Grosso, an ecosystem of high environmental value. A one-dimensional hydrodynamic numerical model was used to quantify the variations in water level and current velocity caused by deepening.

The second article introduces a low computational cost technique based on the combination of Time-Lagged Ensembles (TLE) to enhance the performance of ensemble precipitation forecasts from the GEFS model (NCEP-NOAA) in the Negro River basin. This research is applied to electricity generation.

The third article characterises the wave conditions at a maritime terminal by employing two spectral models, one for deep waters and another for shallow waters. The modelling results were validated over a five-year period, yielding the main characteristics of the waves.

 Articles

• Impacto hidráulico de la apertura de pasos de fondos duros en el río Paraguay sobre la cuenca del Pantanal | 
  

  Hydraulic impact of the opening of hard-bottom passages in the Paraguay River on the Pantanal basin
  Angel N. Menéndez, Pablo Ezequiel Ezequiel García, Raúl A. Cáceres, Patricia R. Jaime, Santiago Guizzardi, Nicolas Diego Badano y Julio C. Cardini
  DOI 10.1080/23863781.2025.2541578

• Aplicación de técnicas de “time-lagged ensembles” al pronóstico de precipitación del modelo GEFS en una cuenca hidroeléctrica | 
  

  Application of time-lagged ensembles techniques to the GEFS precipitation forecast model in a hydroelectric basin
  Alejandra De Vera y Rafael Terra
  DOI 10.1080/23863781.2025.2541575

• Estratégia de aninhamento de modelos espectrais para reconstituição do clima de ondas em regiões costeiras complexas: Terminal da Ilha Guaíba (RJ-Brasil) | 

  Guilherme Colaço Melo Dos Passos, Pedro Henrique Trigo Rosa, Júlia Kaiser, Marcos Nicolas Gallo, Carlos Eduardo Parente, Izabel Christina Martins Nogueira
  DOI 10.1080/23863781.2025.2497230

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