Name: Thais Nunes Coutinho
Type: MSc dissertation
Publication date: 14/05/2019
Advisor:
Name |
Role |
|---|---|
| Julio Tomás Aquije Chacaltana | Advisor * |
Examining board:
| Name |
Role |
|---|---|
| Diogo Costa Buarque | Internal Examiner * |
| Jacqueline Albino | External Examiner * |
| Julio Tomás Aquije Chacaltana | Advisor * |
Summary: Due to the necessity to predict the morphological changes in shoreline, bar migration, estuary dynamic and in ports logistics the sediment transport and morphology bed changes appear as an important theme, mainly. In this work the seabed changes induced by tide, waves and wind in port of Portocel surroundings located at Barra do Riacho, Brazil was studied. The hydrodynamic induced by wave-current interaction was obtained by coupling of shallow water equation with the spectral wave model based on the wave spectral action balance equation. These coupled models are connected through the radiation stress and are solved numerically. The morphological seabed changes are expressed by the seabed sediment mass conservation equation in which four morphological acceleration factors (1, 30, 60 and 90) were tested. It was found a good agreement between model results and measured currents, water levels, significant wave height, peak period, mean direction and net seabed morphology changes. The results of both bedload and suspended sediment transport rates showed that the highest sediment transport rates are located at the north and south of the port. These results are associated with morphological changes in surroundigs of the coast. Morphological seabed changes for 20 years considering waves, wind and tide conditions using morphological acceleration factor equal to 90 shown erosion and depositions rates from 2 m (erosion) to 2.33 m (deposition) in north of port, which was the highest erosion and deposition areas. Results suggest that the waves and tidal elevations are the main physical processes that drive seabed morphology changes leading to erosion near the coast driven by wave breaking and its resulting currents, which transport sediments.
