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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...
DSM generation from stereo aerial images for the reconstruction of the sea-clif...
Gama, Cristina; Jalobeanu, André; Almeida, HelderThe seacliffs evolution is an important aspect to be taken in account in the evolution of the world coastline. The seacliffs can suffer erosion induced by the storm wave incidence or subaerial erosion leading to the retreat of the coastline. However the amount of sediments that come from the cliff retreat represent an important sediment source to the coastal system. In some cases it is essential to include this...
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...
DSM generation from stereo aerial images for the reconstruction of the sea-clif...
Gama, Cristina; Jalobeanu, André; Almeida, HelderThe seacliffs evolution is an important aspect to be taken in account in the evolution of the world coastline. The seacliffs can suffer erosion induced by the storm wave incidence or subaerial erosion leading to the retreat of the coastline. However the amount of sediments that come from the cliff retreat represent an important sediment source to the coastal system. In some cases it is essential to include this...
A new and practical method to obtain grain size measurements in sandy shores based
Baptista, Paulo; Cunha, Telmo; Gama, Cristina; Bernardes, CristinaModern methods for the automated evaluation of sediment size in sandy shores relay on digital image processing algorithms as an alternative to time-consuming traditional sieving methodologies. However, the requirements necessary to guarantee that the considered image processing algorithm has a good grain identification success rate impose the need for dedicated hardware setups to capture the sand surface images...
Caracterização da Agitação Marítima no Arco Litoral Tróia Sines para os anos de...
Zacarias, Nuno; Pinto, José; Gama, Cristina; Silva, FranciscoNeste trabalho procedeu-se ao estudo da agitação marítima, para a área que compreende todo o Arco Litoral Tróia Sines (ALTS) nos anos de 2009 e 2010. Caracterizou-se a agitação marítima ao largo e junto à linha de costa utilizando registos da boia ondógrafo de Sines e resultados das simulações do modelo SWAN, acoplados os modelos ALADIN e MesoNH como forçamento atmosférico. Verificou-se que os Invernos nestes d...
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...
Sediment Transport using Grain Size Trend Analysis: A Case Study in SW of Portugal
Du, XIAOQIN; Gama, Cristina; Liu, JamesAs a embayed coast, the main sediment sources are fluvial discharges, sea-cliff erosion and sand carried by longshore currents [1]. The particles are transported in suspended load or bedload pattern under the coactions of tidal currents and waves. In response to sediment transport processes, the spatial variations in the grain-size parameters exist, that reflect the net particles transport trend and the dynamic...
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