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

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Abstract

Quantification of the accumulated or eroded sediment is an important procedure towards the understanding of shoreline migration and therefore, to the evaluation of littoral dynamics. Tróia Peninsula is a sand spit, made up of dunes and beaches. It is located on the left margin of the Sado River mouth near the foot of the Arrábida Mountain, on the west coast of Portugal, 30 km south of Lisbon. Data from 1928 to 1995 clearly shows an oceanwards coastline migration during this period. The objective of this work is to quantify the volume of sediment accumulated in the NW sector of Tróia Peninsula from 1928 to 1995, a 67 years period, and determine sediments net accumulation rate for that period of time. Using the 1928 bathymetry, from a 1930 nautical chart, and the altimetry, from the 1995 Imoareia topographic survey, the volume of sediments accumulated was calculated, with a Geographic Information System. Digital Terrain Models, representing the topography and bathymetry of both years, were created for the evaluation. Results show a positive variation of 5.718.224 m3 for an area of 938.440 m2, i.e. a net sedimentation rate of approximately 85.000 m3year-1 or 0,09 myear-1.

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Notes

  1. HZ defined according with local (Lisbon port) lowest spring low tide; mean port: 2h22m; mean height unit: 1.63 m.

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Acknowledgments

This work was made possible as part of the FCT and FEDER funded project EVOTRÓIA-Tróia Peninsula Evolution: Coastline and dune systems morphodynamics during the end of the Quaternary, and IMOAREIA, Sonae Turismo, which made the 1995 topography available for scientific purposes.

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  1. LNEG, Estrada da Portela Zambujal – Alfragide, Apartado 7586, 2720-866, Amadora, Portugal

    Luís Rebêlo, Marco Ferraz, Pedro Brito & Pedro Terrinha

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  1. Luís Rebêlo
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  2. Marco Ferraz
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  3. Pedro Brito
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  4. Pedro Terrinha
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Correspondence to Luís Rebêlo.

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Rebêlo, L., Ferraz, M., Brito, P. et al. Quantification of sediments accumulated in the NW sector of Tróia Peninsula (Portugal) between 1928 and 1995. J Coast Conserv 16, 261–268 (2012). https://doi.org/10.1007/s11852-011-0171-2

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  • DOI: https://doi.org/10.1007/s11852-011-0171-2

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