MODELAGEM DO IMPACTO DO APROFUNDAMENTO DO CANAL ESTUARINO DO PORTO DE VITÓRIA NA HIDRODINÂMICA E CONCENTRAÇÃO DE SEDIMENTOS SUSPENSOS

Código

PAP109

Autores

KAIO CALMON LACERDA, Franciane Entringer Curbani, Franciélli de Paula Dela Costa, Fernando Túlio Camilo Barreto, JULIO TOMÁS AQUIJE CHACALTANA

Tema

MEDIÇÃO, MODELAGEM, TÉCNICAS E TECNOLOGIAS NO CONTEXTO DA HIDROSSEDIMENTOLOGIA

Resumo

The deepening of an estuary navigation channel, even if in the order of meters, can result in different impacts on the patterns of water level, currents and salinity gradient. And this commonly results in modifications of erosion and deposition patterns and suspended sediment concentration (SSC). Therefore, it can cause undesirable effects such as greater flood risk and creation of a new and/or larger maintenance dredging requirement. A dredging project of Vitória Port channel, located in Vitória Bay estuary, has been started in 2012 with the goal of reaching ~14 m of depth, when the channel had 10.6 to 13 m depths. And thus allow berthing of large ships. Potential impacts of the deepening of Vitória Port channel are investigated using the hydrodynamic and sediment transport Delft3D model forced by tide, wind, atmospheric pressure and thermohaline gradients.The results suggests that the deepening of the channel results in a larger impact in a localized way, leading to the decrease of the flow velocity andSSCover deepened region.There was a mean reduction of 20% in the velocity magnitude and for water level the results suggest poor impact of millimeters. TheSSCresults suggest a reduction of about 30% (8 mg/L).Therefore the results suggest that the deepening of Vitória Port channel may decrease flow velocityin the deepened regionwith a consequent reduction ofSSC, which would leadto reduction onerosion ratesas well.