Percorrer por autor "López-Ruiz, Alejandro"
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- Longitudinal wave power as a proxy for coastal change detectionPublication . Aragón, Marta; Ferreira, Óscar; López-Ruiz, Alejandro; Ortega-Sánchez, MiguelCoastal areas are subject to atmospheric, fluvial and marine hazards that can cause relevant morphological changes. Wave height (Hs) is the most commonly used climate variable to define morphological changes in coastal engineering studies. However, this approach fails to capture directional effects, which are essential for predicting and managing shoreline erosion and associated risks. This work introduces a methodology that identifies relevant morphological changes (morphological events) by using the longitudinal wave power (LWP), after defining an optimized set of Peak Over Threshold (POT) parameters. The morphological evolution of an idealized river mouth was simulated using the Delft3D numerical model and six different wave climate conditions along with tidal and river flow conditions. The optimized LWP approach performed better than Hs in identifying morphological changes, providing a better agreement between climatological and morphological events. The methodology was further validated through its application to two real-world sites along the southern Iberian Peninsula incorporating real wave conditions, variable river discharges, and complete tidal regimes. In these areas, the numerical models had been previously calibrated. The results confirm the robustness and transferability of the methodology beyond idealized conditions. By considering both erosional and accretional processes, this LWP-based methodology offers coastal managers a robust, physics-based tool for predicting morphological responses to wave conditions, supporting the development of early warning systems on inlet-adjacent shorelines.
- A new management tool to monitor salinity intrusion in the guadiana estuary under average and extreme river discharge conditionsPublication . Martín-Llanes, Guillermo; Garel, Erwan; López-Ruiz, AlejandroAt the Guadiana Estuary (southern Iberia), strong river flow regula-tion and the intensification of droughts pose a significant threat to the freshwater resource due to enhanced saltwater intrusion. To accurately predict the salinity dynamics under various river discharge conditions (i.e., average and extreme), a 3-dimensional idealized model (Delft3D) has been developed, calibrated and val-idated. The overall performances of the model make it a powerful and versatile tool to design and evaluate mitigation management strategies to control salt intru-sion during prolonged periods of low river flow. This paper provides a detailed description of the numerical framework and the validation process, together with examples of the future model applications.
- Unravelling the response of the Guadiana ebb-tidal delta to extreme wave eventsPublication . Rubio, Carlos; Garel, Erwan; Zarzuelo, Carmen; López-Ruiz, AlejandroThis study investigates the morphodynamic response of the Guadiana ebb-tidal delta to extreme wave storms using a process-based numerical model. Field data including wave climate, wind and bathymetry were integrated into the Delft3D model, calibrated and validated with hydrodynamic data collected at the lower estuary in 2013, 2015 and 2023 and bathymetric maps of the ebb delta from 2016 and 2017. The analysis focuses on the impact of Storm Emma (February-March 2018), characterised maximum wave height up to 7.1 m. Results show that Emma induced a significant shift in sediment dynamics, causing retreat and erosion of the updrift shoal complex (with a net sediment volume loss of 2.40%), sediment transfer to the downdrift complex (that gained sediment volume of 0.32%), and channel rotation.. These changes contrast with the seaward growth of the shoal under mild conditions observed during non-extreme conditions, as between 2016 and 2017. The results highlight the importance that large extreme wave events can have on the morphodynamic evolution of ebb tidal deltas.