Coastline evolution of Portuguese low-lying sandy coast in the last 50 years: an integrated approach
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 holisti...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Copernicus Publications
2016-06-01
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| Series: | Earth System Science Data |
| Online Access: | http://www.earth-syst-sci-data.net/8/265/2016/essd-8-265-2016.pdf |
| _version_ | 1819086299742601216 |
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| author | C. Ponte Lira A. Nobre Silva R. Taborda C. Freire de Andrade |
| author_facet | C. Ponte Lira A. Nobre Silva R. Taborda C. Freire de Andrade |
| author_sort | C. Ponte Lira |
| collection | DOAJ |
| description | 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.<br><br>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.<br><br>The methodology used quantifies coastline evolution using a unique and robust
coastline indicator (the foredune toe), which is independent of short-term
changes.<br><br>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
<a href="https://doi.pangaea.de/10.1594/PANGAEA.859136" target="_blank">https://doi.pangaea.de/10.1594/PANGAEA.859136</a> and can be used in other
studies.<br><br>Results show beach erosion as the dominant trend, with a mean change rate of
−0.24 ± 0.01 m year<sup>−1</sup> 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 Sines–Cape S. Vicente have experienced less
intervention and show stable or moderate accretion behaviour. |
| first_indexed | 2024-12-21T21:18:03Z |
| format | Article |
| id | doaj.art-51732ffc08e445a4a1c8147f3f208342 |
| institution | Directory Open Access Journal |
| issn | 1866-3508 1866-3516 |
| language | English |
| last_indexed | 2024-12-21T21:18:03Z |
| publishDate | 2016-06-01 |
| publisher | Copernicus Publications |
| record_format | Article |
| series | Earth System Science Data |
| spelling | doaj.art-51732ffc08e445a4a1c8147f3f2083422022-12-21T18:49:58ZengCopernicus PublicationsEarth System Science Data1866-35081866-35162016-06-018126527810.5194/essd-8-265-2016Coastline evolution of Portuguese low-lying sandy coast in the last 50 years: an integrated approachC. Ponte Lira0A. Nobre Silva1R. Taborda2C. Freire de Andrade3IDL – Instituto Dom Luiz, Faculdade de Ciências da Universidade de Lisboa, Campo Grande, 1749-016 Lisbon, PortugalIDL – Instituto Dom Luiz, Faculdade de Ciências da Universidade de Lisboa, Campo Grande, 1749-016 Lisbon, PortugalIDL – Instituto Dom Luiz, Faculdade de Ciências da Universidade de Lisboa, Campo Grande, 1749-016 Lisbon, PortugalIDL – Instituto Dom Luiz, Faculdade de Ciências da Universidade de Lisboa, Campo Grande, 1749-016 Lisbon, PortugalRegional/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.<br><br>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.<br><br>The methodology used quantifies coastline evolution using a unique and robust coastline indicator (the foredune toe), which is independent of short-term changes.<br><br>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 <a href="https://doi.pangaea.de/10.1594/PANGAEA.859136" target="_blank">https://doi.pangaea.de/10.1594/PANGAEA.859136</a> and can be used in other studies.<br><br>Results show beach erosion as the dominant trend, with a mean change rate of −0.24 ± 0.01 m year<sup>−1</sup> 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 Sines–Cape S. Vicente have experienced less intervention and show stable or moderate accretion behaviour.http://www.earth-syst-sci-data.net/8/265/2016/essd-8-265-2016.pdf |
| spellingShingle | C. Ponte Lira A. Nobre Silva R. Taborda C. Freire de Andrade Coastline evolution of Portuguese low-lying sandy coast in the last 50 years: an integrated approach Earth System Science Data |
| title | Coastline evolution of Portuguese low-lying sandy coast in the last 50 years: an integrated approach |
| title_full | Coastline evolution of Portuguese low-lying sandy coast in the last 50 years: an integrated approach |
| title_fullStr | Coastline evolution of Portuguese low-lying sandy coast in the last 50 years: an integrated approach |
| title_full_unstemmed | Coastline evolution of Portuguese low-lying sandy coast in the last 50 years: an integrated approach |
| title_short | Coastline evolution of Portuguese low-lying sandy coast in the last 50 years: an integrated approach |
| title_sort | coastline evolution of portuguese low lying sandy coast in the last 50 years an integrated approach |
| url | http://www.earth-syst-sci-data.net/8/265/2016/essd-8-265-2016.pdf |
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