Quantification of sediments accumulated in the NW sector of Tróia Peninsula (Portugal) between 1928 and 1995

Rebelo, Luís; Ferraz, Marco; Brito, Pedro; Terrinha, Pedro

doi:10.1007/s11852-011-0171-2

Cited by 4 publications

(3 citation statements)

References 3 publications

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“…Abecassis et al, 1970;Barceló, 1971;Castanho et al, 1974;Bettencourt and Ângelo, 1992;Ferreira, 1992;Oliveira, 2005;Pinto and Teixeira, 2005;VelosoGomes et al, 2009;Taveira Pinto et al, 2009;Rebêlo et al, 2011;Silva et al, 2013), and different coastline proxies are used (e.g. European Commission, 2004;Oliveira, 2005;Ferreira et al, 2006;Rebêlo et al, 2011;Cenci et al, 2013).…”

Section: Introductionmentioning

confidence: 99%

Coastline evolution of Portuguese low-lying sandy coast in the last 50 years: an integrated approach

Lira

Silva

Taborda

et al. 2016

Earth Syst. Sci. Data

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Abstract. Regional/national-scale information on coastline rates of change and trends is extremely valuable, but these studies are scarce. A widely accepted standardized methodology for analysing long-term coastline change has been difficult to achieve, but it is essential to conduct an integrated and holistic approach to coastline evolution and hence support coastal management actions. Additionally, databases providing knowledge on coastline evolution are of key importance to support both coastal management experts and users.The main objective of this work is to present the first systematic, national-scale and consistent long-term coastline evolution data of Portuguese mainland low-lying sandy coasts.The methodology used quantifies coastline evolution using a unique and robust coastline indicator (the foredune toe), which is independent of short-term changes.The dataset presented comprises (1) two polyline sets, mapping the 1958 and 2010 sandy beach-dune system coastline, both optimized for working at 1 : 50 000 scale or smaller; (2) one polyline set representing long-term change rates between 1958 and 2010, each estimated at 250 m; and (3) a table with minimum, maximum and mean of evolution rates for sandy beach-dune system coastline. All science data produced here are openly accessible at https://doi.pangaea.de/10.1594/PANGAEA.859136 and can be used in other studies.Results show beach erosion as the dominant trend, with a mean change rate of −0.24 ± 0.01 m year −1 for all mainland Portuguese beach-dune systems. Although erosion is dominant, this evolution is variable in signal and magnitude in different coastal sediment cells and also within each cell. The most relevant beach erosion issues were found in the coastal stretches of Espinho-Torreira and Costa Nova-Praia de Mira, Cova da Gala-Leirosa, and Cova do Vapor-Costa da Caparica. The coastal segments Minho River-Nazaré and Costa da Caparica adjacent to the coast exhibit a history of major human interventions interfering with the coastal system, many of which originated and maintained a sediment deficit. In contrast, the coastal segments Troia-Sines and SinesCape S. Vicente have experienced less intervention and show stable or moderate accretion behaviour.

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Section: Introductionmentioning

confidence: 99%

Coastline evolution of Portuguese low-lying sandy coast in the last 50 years: an integrated approach

Lira

Silva

Taborda

et al. 2016

Earth Syst. Sci. Data

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show abstract

“…In Portugal, coastline evolution studies are usually local to mesoscale in their spatial scope and essentially focus on problematic areas (e.g. Abecassis et al, 1970;Barceló, 1971;Castanho et al, 1974;Bettencourt and Ângelo, 1992;Ferreira, 1992;Oliveira, 2005;Pinto and Teixeira, 2005;Veloso-Gomes et al, 2009;Taveira Pinto et al, 2009;Rebêlo et al, 2011;Silva et al, 2013), and different coastline proxies are used (e.g. European Commission, 2004;Oliveira, 2005;Ferreira et al, 2006;Rebêlo et al, 2011;Cenci et al, 2013).…”

Section: Introductionmentioning

confidence: 99%

Coastline evolution of Portuguese low-lying sandy coast in the last 50 years: an integrated approach

Lira¹,

Silva²,

Taborda³

et al. 2016

Preprint

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Abstract. Regional/global-scale information on coastline rates of change and trends is extremely valuable, but national-scale studies are scarce. A widely accepted standardized methodology for analysing long-term coastline change has been difficult to achieve, but is essential to conduct an integrated and holistic approach to coastline evolution and hence support coastal management actions. Additionally, databases providing knowledge on coastline evolution are of key importance to support both coastal management experts and users. The main objective of this work is to present the first systematic, global and consistent long-term coastline evolution data of Portuguese mainland low-lying sandy. The methodology used quantifies coastline evolution using an unique and robust coastline indicator (the foredune toe), which is independent of short-term changes. The dataset presented comprises: 1) two polyline sets, mapping the 1958 and 2010 sandy beach-dune systems coastline, both optimized for working at 1:50 000 scale or smaller, and 2) one polyline set representing long-term change rates between 1958 and 2010, estimated at each 250 m. The science data produced here are in Open Access at doi:10.1594/PANGAEA.853654 and can be used in other studies. Results show beach erosion as the dominant trend, with a mean change rate of −0.24 &pm; 0.01 m/year for all mainland Portuguese beach-dune systems. Although erosion is dominant, this evolution is variable in signal and magnitude in different coastal sediment cell and also within each cell. The most relevant beach erosion issues were found in the coastal stretches of Espinho – Torreira and Costa Nova – Praia da Mira, both at sub-cell 1b; Cova Gala – Leirosa, at sub-cell 1c and Cova do Vapor – Costa da Caparica, at cell 4. Cells 1 and 4 exhibit a history of major human interventions interfering with the coastal system, many of which originated and maintained a sediment deficit. In contrast, cells 5 and 6 have been less intervened and show stable or moderate accretion behaviour.

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“…The use of Uw and Dw terminology, which pertains to wave propagation directions and their impact on sheltering, is preferred over terminologies associated with longshore sediment transport directions (updrift and downdrift), generally used in coastal studies 7 . This is due to the occasional lack of alignment between the two terminologies as evidenced by Tróia-Sine's embayment, where the Uw headland is located at the downdrift end of the beach 45,46 and because it highlights the relevance of wave sheltering effects as opposed to sediment transport processes.…”

Section: Data: Real Beach Casesmentioning

confidence: 99%

Embayed beach configuration explained by wave sheltering

Nobre Silva,

Taborda,

Andrade

2024

Sci Rep

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Embayed beaches, characterized by their distinctive planform curvature, are a common feature along coastlines worldwide. This study introduces a novel approach to describe bay shape that extends our understanding about the processes that control embayed beach development. The novel approach was thoroughly tested against one-line models and applied to real-world cases covering a wide range of spatial scales, wave climate conditions and geomorphological settings. Here we show that the equilibrium curvature of embayed beaches can be correctly described and explained by considering headland-provided offshore wave sheltering alone, without explicitly accounting for wave shoaling, refraction, diffraction, or longshore transport. This holds true as long as the offshore wave climate is accurately characterized, including complete information regarding the mean and the spread of the incoming wave direction. For narrow-banded dominant swell wave regimes, the inclusion of background wind sea components has been identified as crucial for predicting curvature in the more sheltered embayed domain. The presented model significantly contributes to the understanding of how waves shape embayed beaches.

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Quantification of sediments accumulated in the NW sector of Tróia Peninsula (Portugal) between 1928 and 1995

Cited by 4 publications

References 3 publications

Coastline evolution of Portuguese low-lying sandy coast in the last 50 years: an integrated approach

Coastline evolution of Portuguese low-lying sandy coast in the last 50 years: an integrated approach

Coastline evolution of Portuguese low-lying sandy coast in the last 50 years: an integrated approach

Embayed beach configuration explained by wave sheltering

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