Browsing by Author "Perez, Jokin Echezarreta"
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- Tidal channel hydrodynamics and salt marsh deposition under varying sea-level rise scenariosPublication . Perez, Jokin Echezarreta; Carrasco, Ana Rita; Ferreira, ÓscarIn this study, two process-based modelling approaches built in the Delft3D domain were applied to predict changes induced by sea-level rise (SLR) in the tidal circulation and bathymetric evolution of the Ria Formosa coastal lagoon. An unstructured grid modelling approach was calibrated and validated to predict changes in the tidal circulation in the year 2100 of the western sector of the lagoon. The model was forced by tides and a static sea level, with four scenarios of sea-level rise considered. To predict bathymetric changes in the lagoon, a structured grid modelling approach was forced by tides and a linear sea-level rise, with one scenario of sea-level rise considered. Model results indicate that sea-level rise (SLR) will change residual sediment circulation patterns over the 89-year study period, with the intensity of the impact directly influenced by the intensity of SLR. Under sea-level rise, flood-dominance of the Ancão Inlet increases, hinting to an attenuation of flood dominance in the Faro-Olhão Inlet and a higher role of the Ancão Inlet in capturing the tidal prism. Bathymetric changes over time are considerable in the Ancão and Faro-Olhão inlets and marginal in the channel and tidal marsh areas. Despite some limitations, the results of this study contribute to the scientific knowledge about the impacts of SLR in the hydrodynamics and morphodynamics of coastal lagoons. This study also provides a first exploration of the morphological changes induced by SLR in the Ria Formosa coastal lagoon and recommendations for future research.