Juan L. Garzon

University of Algarve | UALG · Centro de Investigação Marinha e Ambiental (CIMA)

Early warning systems (EWSs) for coastal erosion are cost‐effective instruments for risk reduction. Among other aspects, the selection of the pre‐storm beach morphology and the definition of storm characteristics can affect EWS reliability. Here, XBeach simulations were used to assess the uncertainties in beach‐dune erosion related to the variabili...

Beaches combined with sloping structures are frequently the first element of defense to protect urban areas from the impact of extreme coastal flooding events. However, these structures are rarely designed for null wave overtopping discharges, accepting that waves can pass above the crest and threat exposed elements in hinterland areas, such as ped...

This work aimed at testing the capability of the numerical model SWASH to be implemented in the prototype of the overtopping and flooding forecast system HIDRALERTA for Ericeira harbour. In contrast to the neural network NN_OVERTOPPING2, which is currently implemented in HIDRALERTA, SWASH is able to estimate the flood extension and wave propagation...

Communities can be vulnerable to wave-induced flooding and the risk is expected to increase with rising sea levels and population growth. Under this threat, early warning systems are relevant instruments for effective risk reduction strategies. These systems combine accurate hazard estimations with risk level classification for specific coastal rec...

Process-based models are suitable tools for reproducing storm-driven erosion. However, their performance has been mainly examined on mild-slope sandy beaches and their use on steep beaches still represents a challenge. Here, open-source process-based model XBeach experiments were combined with topographical measurements collected for two storms (16...

Wave-induced flooding represents a threat and sea-level rise will exacerbate the problem. Bayesian Network tools that surrogate hydrodynamic and risk models were designed to predict risks induced by overwash/overtopping at Praia de Faro and Quarteira (Portugal) for current and future conditions. A 23.5 year-dataset of oceanic conditions for the 199...

The model inputs and outputs for all the simulations supporting the results of this study are available here.

Saltmarshes are increasingly recognised an important asset in coastal management as they dissipate wave energy and thus reduce the potential for coastal flooding. The frontal surface area (FSA) and the drag coefficient (Cd) are parameters commonly used in wave attenuation models to express the resistance of vegetation structure to incident waves. T...

https://cmswebonline.com/iahr2022/epro/html/07-03-001-83.xml

The alongshore response of dunes to storm events can be extremely variable and, consequently, their capacity to maintain their services, including the protection of hinterland communities. In this study, the role of biotic and abiotic factors determining the magnitude of dune retreat driven by a severe storm along a 60 km barrier island system was...

Resumo: Este estudo recorre a ferramentas de modelação numérica, XBeach e SWASH, para a avaliação dos eventos de galgamento costeiro devido a tempestades marítimas no troço costeiro urbano da Costa da Caparica, que compreende a estrutura rígida aderente. Faz-se uma análise comparativa entre os modelos, e confronta-se com a informação de eventos doc...

É cada vez mais usual o recurso à modelação numérica para a simulação de eventos de galgamento, inundação e erosão em zonas costeiras. Neste estudo, recorre-se ao acoplamento de dois modelos, SWAN + XBeach (modo surf beat), para a propagação da agitação marítima do largo até à zona de espraio e para reproduzir a evolução morfodinâmica, a fim de ava...

This study investigates the capacity of a Spartina alterniflora meadow to attenuate waves during storm events based on field observations in the Chesapeake Bay. These observations reveal that environmental conditions including the ratio between water depth and plant height (hr), the ratio between wave height (HS) and water depth, and current direct...

Assessing the accuracy of nearshore numerical models—such as SWAN—is important to ensure their effectiveness in representing physical processes and predicting flood hazards. In particular, for application to coastal wetlands, it is important that the model accurately represents wave attenuation by vegetation. In SWAN, vegetation might be implemente...

Saltmarshes have the potential to protect coastal communities from the impact of waves caused by severe storms. While recent developments in numerical models are enhancing the simulation of wave-vegetation interactions, the estimation of the drag coefficient (C d ), used to account for the reduction of wave energy by vegetation, is still a source o...

The increasing rate of sea level rise (SLR) poses a major threat to coastal lands and natural resources, especially affecting natural preserves and protected areas along the coast. These impacts are likely to exacerbate when combined with storm surges. It is also expected that SLR will cause spatial reduction and migration of coastal wetland and ma...

Accurate forecast of sea-level heights in coastal areas depends, among other factors, upon a reliable coupling of a meteorological forecast system to a hydrodynamic and wave system. This study evaluates the predictive skills of the coupled circulation and wind-wave model system (ADCIRC+SWAN) for simulating storm tides in the Chesapeake Bay, forced...

Hurricanes and tropical storms represent one of the major hazards in coastal communities. Storm surge generated by strong winds and low pressure from these systems have the potential to bring extensive flooding in coastal areas. In many cases, the damage caused by the storm surge may exceed the damage from the wind resulting in the total collapse o...

The authors wish to make the following corrections to their paper [1]. In the third paragraph on Page 14, "PRC, W, and PRC" should be changed to "PRC, W, and PRW". Moreover, the authors found that Figure 6 has an incorrect legend. It should be as follows: The authors would like to apologize for any inconvenience caused. The change does not affect t...

Large estuaries are especially vulnerable to coastal flooding due to the potential of combined storm surges and riverine flows. Numerical models can support flood prevention and planning for coastal communities. However, while recent advancements in the development of numerical models for storm surge prediction have led to robust and accurate model...

Garzon, J.L.; Ferreira, C.; Dalrymple, R. A., and Guikema, S.D., 2016. Efficient integration of a storm surge model into a multidisciplinary agent based model framework. In: Vila-Concejo, A.; Bruce, E.; Kennedy, D.M., and McCarroll, R.J. (eds.), Proceedings of the 14th International Coastal Symposium (Sydney, Australia). Journal of Coastal Research...