Percorrer por autor "Sacnun, Sara"
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- Importance of forcing parameters and geological controls on coastal hazards of a sandy urban beach (Cadiz, Spain).Publication . Sacnun, Sara; Ferreira, Óscar Manuel Fernandes Cerveira; Garzón, Juan Luis; Plomaritis, TheocharisCoastal regions experience various hydrodynamic and geomorphological processes across different timescales. In geologically controlled coastal settings, inherited geological factors can significantly influence beach morphology, sometimes more so than present-day dynamics. This thesis investigates the role of geological features in shaping the dynamics of La Victoria Beach in Cádiz, Spain and how they interact with other forcing parameters focusing on erosion and overwash processes during extreme weather events. The study integrates bathymetric, wave, tidal, and topographic data to model pre- and post-storm profiles for significant storms. Using the XBeach numerical model, the thesis explores the influence of the nearshore rocky platform and the offshore reef on wave energy and sediment transport. The model simulations assess various scenarios, including the presence or absence of geological features and changes in future sea level. Results indicate that geological features, such as rocky platforms and reefs, create pronounced alongshore gradients in wave energy, leading to significant variations in beach morphodynamics. These features act as natural barriers, reducing the impact of storm waves and stabilizing beach morphology. The study also highlights the importance of wave direction, as variations can significantly alter erosion and overwash patterns. The study further demonstrates that moderate increases in sea level can exacerbate coastal hazards, amplifying erosion and overwash risks. The calibrated XBeach model proves effective in predicting beach morphological changes under different conditions, though deviations in sediment accumulation and erosion rates suggest the need for further model refinement and localized data integration. The present thesis investigates on how geological features influence coastal hazard dynamics, providing a foundation for developing adaptive coastal management strategies. By integrating geological controls, wave dynamics, and climate change projections, coastal managers can better protect urban beaches like La Victoria from increasing natural and anthropogenic threats.