se caracterizan por la disponibilidad de arena fina sepultando antiguos acantilados. Las rampas de arena están condicionadas por los vientos del OSO, episódicamente afectados por vientos del sur. De la comparación de fotografías aéreas e imágenes satelitales se desprende que los ritmos de erosión son de 0,4 m/año con leve incremento en los últimos años. Si bien los vientos más frecuentes son registrados desde el N, los vientos en las playas dominan desde el OSO. Esto esta corroborado por ritmos de migración de las dunas litorales de 3 a 6 m/año, que a su vez afectan la migración de las desembocaduras. Perfiles de playa monitoreados en los bienios 2004-2005 y 2018-2019 indican que la mayor variabilidad se da en los sectores intermareales y en las rampas (transición entre la playa supralitoral y la duna litoral). Esta dinámica litoral-eólica condiciona las estrategias de forestación y urbanización en estas localidades balnearias con abundancia de arena.Palabras clave: dunas litorales, vientos del O,
The Burdwood Bank is a rocky platform emerging from the abyssal plain to depths of 50-100 m between the South Atlantic Ocean and the Drake Passage. Regarding its geological affinity, it has a composition similar to the Staten Island (Isla de los Estados), therefore aligned to the Andes-Darwin Cordillera. This bank is crossed from south to north by the Antarctic Bottom Water; very cold and rich in nutrients. Rocks dredged from the shallower portions at its western portion are composed of carbonatic blocks. The analyses indicate fossil specimens of Desmophyllum sp. (Order Scleractinia) and Gorgonacea palmatum (Order Gorgonacea), genera living today in the region. In this sense, sectors of this western portion should be considered as an ancient reef composed mostly of cold-water corals. The major implications are assigned to oceanographic and climatic issues. During the Upper-Pleistocene lowstand, sunlight was more available at shallower depths and therefore corals were very frequent at wave-dominated areas. Sea-level variations have therefore strong influence on cold-water coral growths in the sense that nutrient availability by currents can significantly changed between glacial and interglacial periods.
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