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O fenomeno da erosao costeira afeta profundamente a costa portuguesa. O sistema praia-oceano nao se pode considerar em situacao de equilibrio morfodinâmico, porque as praias sao sistemas abertos, sendo os seus sedimentos constantemente transportados. Os ventos, mares e agitacao marinha sao os principais agentes erosivos, mas existem outras causas de origem antropica que influenciam os processos erosivos. Este trabalho tem como objetivo avaliar as alteracoes morfologicas de muito curto termo em diferentes estados de agitacao e tipologia de mare, na praia de Ofir, situada na costa NO Portuguesa. Esta praia foi intervencionada com cilindros geossinteticos como medida de defesa costeira. O trabalho e baseado num programa de monitorizacao, recorrendo a levantamentos topograficos de alta precisao com auxilio de equipamento DGPS. A aplicacao de cilindros geossinteticos nesta praia revelou-se eficiente no periodo analisado e nas condicoes de agitacao e mare verificadas, embora tenham sofrido erosao ficando expostos. CHARACTERIZATION OF BEACH MORPHODYNAMICS UNDER THE INFLUENCE OF GEOSYNTHETIC CYLINDERS: OFIRBEACH, PORTUGAL, CASE STUDY ABSTRACT  The phenomenon of coastal erosion deeply affects the Portuguese coast. The beach-ocean system cannot be considered in a situation of morphodynamic balance because the beaches are open systems, and their sediments are being constantly transported. Winds, tides and waves are the main erosive actions, but there are other causes of anthropogenic origin that influence erosional processes. This work aims to evaluate the morphological changes of short time scale, considering different waves and tide conditions at Ofir beach, located at the NW Portuguese coast. This beach was intervened with geosynthetic cylinders as a coastal defense measure. The work is based on a monitoring program, using high-precision topographic surveys with DGPS equipment. The application of geosynthetic cylinders on this beach proved to be efficient in the analyzed period and in the verified conditions of waves and tides, although they have suffered erosion and have been exposed.

CARACTERIZAÇÃO DA MORFODINÂMICA DE PRAIAS SOB INFLUÊNCIA DE CILINDROS GEOSSINTÉTICOS: CASO DE ESTUDO DA PRAIA DE OFIR, PORTUGAL