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Variability over time in the sources of South Portuguese Zone turbidites: evide...
Pereira, Manuel Francisco; Ribeiro, Carlos; Vilallonga, Filipa; Chichorro, Martim; Drost, Kirsten; Silva, José Brandão; Albardeiro, Luis; Hofmann, MandyThis study combines geochemical and geochronological data in order to decipher the provenance of Carboniferous turbidites from the South Portuguese Zone (SW Iberia). Major and trace elements of 25 samples of graywackes and mudstones from the Mértola (Visean), Mira (Serpukhovian), and Brejeira (Moscovian) Formations were analyzed, and 363 U-Pb ages were obtained on detrital zircons from five samples of graywacke...
Sedimentary provenance of Neogene strata from the SW Portuguese coast (Sines Ca...
Albardeiro, Luis; Pereira, M. Francisco; Gama, Cristina; Chichorro, Martim; Hofmann, Mandy; Linnemann, UlfIn this preliminary study of provenance analysis Neogene sandstones and conglomerates of the Alvalade Basin were sampled, from the sea cliffs nearby the Sines Cape (SW Portuguese Coast). Detrital zircons were extracted by conventional methods of particle size separation, magnetic and heavy liquids separation. Detrital zircons were dated by U-Pb method with LA-ICPMS. The U-Pb geochronology results indicate as po...
Short-term evolution of a reflective beach sector in front of a coastal lagoon ...
Gama, Cristina; Albardeiro, Luís; Jacob, José; Pinheiro, IsabelThe subaerial beache act as detritical barriers in the opening and closing of lagoons located in sandy coastal ares. The study of beach morphodynamics, considering the evolution of the beachface and the berm, in these cases is critical to coastal management. The studied area located in an embayed sandy coastline at the Portuguese Southwest Atlantic Coast, is a 308m long subaerial, coarse to very coarse, sandy b...
Short-term evolution of a reflective beach sector in front of a coastal lagoon ...
Gama, Cristina; Albardeiro, Luís; Jacob, José; Pinheiro, IsabelSeveral coastal lagoon entrances are controlled by the contiguous subaerial beach that works as a detrital barrier. Hence the importance of characterizing the adjacent beach morphodynamics regarding the beachface and berm reconstruction for coastal management proposals. The studied area, a subaerial beach sector of 308 m, located in front of the Melides coastal lagoon, is placed in an embayed sandy coastline a...
Equilibrium configuration of sandy embayed beaches from the
Gama, Cristina; Coelho, Carlos; Baptista, Paulo; Albardeiro, LuísThe planform of five embayed sandy beaches (São Torpes, Furnas, Amoreira, Monte Clérigo and Arrifana), from the Southwest Portuguese rocky coast were compared to theoretical equilibrium curves (logarithmic spiral and parabolic). The beach planform configurations were defined based on aerial photography and the 2 m (MSL) contour extracted from DGPS field surveys (Furnas and Amoreira beaches). In order to analyse...
Medium-term evolution of an intermediate beach with an intertidal bar
Gama, Cristina; Fortes, Joana; Baptista, Paulo; Albardeiro, Luís; Pinheiro, Liliana; Salgado, RuiThe subaerial beach and low tide terrace morphology of the Amoreira beach (Southwest Portuguese Coast) was assessed using a DGPS system between December 2006 and October 2008. The offshore wave conditions were described by the SWAN model, and the nearshore wave using the COULWAVE model. DEMs show significant variations on beach width and berm elevation, and intertidal bar migration. The seasonal variation of th...
Descrição da configuração da linha de costa ao longo do Arco Litoral Tróia-Sines.
Gama, Cristina; Albardeiro, Luís; Baptista, PauloAerial photography of 1996, 2001 and 2002 were used to obtain the alongshore characterization of subaerial beach width of the Tróia-Sines embayed coast. The Digital Shoreline Analysis System (DSAS) extension for ArcGIS v.9.0 was used to describe the variation of the shoreline configuration. The Tróia-Sines embayed coast is characterized by the southward increase of the beach width and berm high. Despite the sim...
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