Percorrer por autor "Hemanath, Lavanya"
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- Modelling storm-induced erosion in coastal embayments in the Victoria Coast (Southern Australia) supported by citizen science dataPublication . Hemanath, Lavanya; Loureiro, Carlos; Garzon, Juan L.Storms play a crucial role in shaping coastal landscapes, driving significant morphological changes and influencing short and long-term beach stability. The significance of understanding coastal storms and their associated impacts is pivotal for coastal management. Coastal erosion responses to storm events vary significantly depending on the coastal geomorphology of the beaches. This thesis investigated the performance of the XBeach model in simulating storm erosion in selected embayed beaches on the coast of Victoria (Australia). High-resolution Citizen Science datasets were employed to calibrate and validate the models in Apollo Bay, Marengo and Port Fairy beaches. The models were extensively calibrated to simulate the erosional response to high-intensity storms, and validated with lower intensity storms. Calibrated models accurately reproduced storm induced erosion with excellent performance scores of BSS - 0.9 and RMSE - 0.2 for all the study sites. A sensitivity analysis performed by varying parameters like wetslp, dryslp, gamma, alpha and delta, revealed that the models were extremely sensitive to a combination of gamma and delta values, but showed limited variation in performance for changes in wetslp and dryslp. The models exhibited a high degree of sensitivity to the antecedent topography of the profiles considered, with the beach face slope being the major factor controlling the modelled storm erosion response, thus the selection of facua, beta, gammax, gamma2, and facsl values for each site was contingent upon the steepness of the profiles considered. This indicated that site-specific hydrodynamics and morphological conditions controlled the response of the beaches to storms. Thus, sites with similar coastal characteristics exhibited similar responses to storms, and the model parameterisations obtained for a specific site resulted in reasonale to poor performance scores when applied to other sites. The beach slope, reflecting the morphodynamic state of the beach, showed that the geological controls on embayed beaches indirectly influenced XBeach parameterization through adjustments related to the slope.