Sediment dynamics and morphological evolution in the Tagus Estuary inlet

Fortunato, A. B.; Freire, P.; Mengual, Baptiste; Bertin, Xavier; Pinto, Celso Aleixo; Martins, Kévin; Guérin, Thomas; Azevedo, Alberto

doi:10.1016/j.margeo.2021.106590

Cited by 18 publications

(8 citation statements)

References 60 publications

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“…At the northern extreme, Cova do Vapor faces the Tagus river mouth, a tide-dominated estuary, with complex morphological interactions and evolution [17], which also affects the Costa da Caparica beach sediment transport fluxes and stability. Along the 5 km stretch to the south of Cova do Vapor, the coastline presents an alluvial plain with strong anthropogenic occupation [17].…”

Section: Study Areamentioning

confidence: 99%

Evaluation of Coastal Protection Strategies at Costa da Caparica (Portugal): Nourishments and Structural Interventions

Sancho

2023

JMSE

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Costa da Caparica beach, in Portugal, has suffered from chronic erosion for the last 50 years, a phenomenon that has been countered by various management interventions. This study aims at comparing sixteen possible interventions, thus identifying the most effective one(s) in terms of reducing beach erosion or even promoting beach accretion. This exercise is achieved using a one-line shoreline evolution model, calibrated with in situ field data, forced by local wave conditions. The target management period is 25 years. In the calibration phase, it is found that the annual mean alongshore net sediment transport along the 24 km sandy coast is variable in direction and magnitude, but it is mostly smaller than ±50 × 103 m3/year. This net transport results from the imbalance of northward/southward-directed bulk transports of circa tenfold-larger magnitudes. This affects the overall sediment balance at the urban beaches, as well as the effectiveness of the intervention strategies. The results show that the present management strategy is effective in holding the shoreline position, although deploying the same nourishment volume but over a shorter area could lead to better results. The best solutions, which are capable of promoting beach accretion, implicate the lengthening of the terminal groin at the northern extremity of the beach. The results from this study can support decision makers in identifying the most appropriate management action, not just locally but also at other coastal regions where similar problems persist and the same methodology could be applied.

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Section: Study Areamentioning

confidence: 99%

Evaluation of Coastal Protection Strategies at Costa da Caparica (Portugal): Nourishments and Structural Interventions

Sancho

2023

JMSE

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“…At the mouth, complex bed morphologies are found over ebb shoals, like the Bugio Bank (Figure 1b), with bed sediments mainly composed of marine medium sands (Freire et al, 2007). For the past eight decades, the morphology of the TEM has been experiencing a significant evolution, in particular a strong erosion of the ebb shoal and the adjoining beaches (Fortunato et al, 2021).…”

Section: Study Area and Field Campaignmentioning

confidence: 99%

“…Delpey et al, 2014;Chen et al, 2019), or sediment transport and morphodynamics (e.g. Bertin et al, 2009;Dodet et al, 2013;Fortunato et al, 2021). WCI have been widely studied for several decades using various approaches including analytical solutions (Phillips, 1977), field observations (e.g.…”

Section: Introductionmentioning

confidence: 99%

Wave-current interactions at the Tagus Estuary Mouth (Portugal) under storm wave conditions

et al. 2022

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“…The palaeoenvironmental reconstruction of such coastal systems is then complicated by the usually complex interaction between tidal and fluvial dynamics (Dabrio et al, 2000;Ciavola and Collins, 2004). Tidal currents and fluvial fluctuations control the main paths of sediment transport and accumulations, and the generation of beaches, beach ridges and spits inside these systems (Fortunato et al, 2021). Multi-temporal maps and images help to understand the evolutionary trends of the different environments forming the estuary (Ghosh, 2019;Aranda et al, 2020).…”

Section: Low Sedimentary Coasts: Barrier Islands Lagoons Salt Marshes...mentioning

confidence: 99%

The complexity of studying coasts: From forms and processes to management

Prieto

2022

CIG

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Coastal environments are characterized by their high dynamism, related to the interaction between marine agents (winds, waves, currents, sea level changes) and continental forms and processes. The present article summarizes the main morphodynamic characteristics of coasts and the resulting environments. Different oscillations of the sea level are considered, depending on their amplitude and frequency: rapid eustatic fluctuations, energetic tsunamis, storm waves and surges, tides and good weather wind waves. Coastal environments are classified in low, sedimentary coasts, including beaches, dunes, barrier islands, lagoons, salt marshes and river mouths, and high, rocky coasts. Management of coastal zones needs a deep knowledge of all the processes involved at the littoral, especially at the local scale, since coastal processes vary rapidly alongshore. At present the integrated coastal management intends to involve different socioeconomic sectors interested in the occupation and use of coasts. Coastal management must include the adaptation of human activities to the natural processes and associated coastal hazards and the protection of coastal values, both of natural and historical-cultural character. Public administrations at different levels should consider the knowledge of the coastal processes at different scales and their potential interaction with human activities in order to design laws and regulations accordingly.

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Sediment dynamics and morphological evolution in the Tagus Estuary inlet

Cited by 18 publications

References 60 publications

Evaluation of Coastal Protection Strategies at Costa da Caparica (Portugal): Nourishments and Structural Interventions

Evaluation of Coastal Protection Strategies at Costa da Caparica (Portugal): Nourishments and Structural Interventions

Wave-current interactions at the Tagus Estuary Mouth (Portugal) under storm wave conditions

The complexity of studying coasts: From forms and processes to management

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