%0 Journal Article
%T Morfodin¨¢mica de playas meso y macromareales de Buenos Aires, R¨ªo Negro y Chubut
%A Isla
%A Federico I
%A B¨¦rtola
%A Germ¨¢n R
%A Schnack
%A Enrique J
%J Revista de la Asociaci£¿3n Argentina de Sedimentolog£¿-a
%D 2001
%I Scientific Electronic Library Online
%X in order to analise and compare the morphologic and grainsize characteristics of the sandy meso- and macrotidal beaches of buenos aires, r¨ªo negro and chubut, topographic surveys were executed and samples collected at the bathing villages of san cayetano, orense, claromec¨®, and beaches from baliza san mat¨ªas, playa larralde and puerto pir¨¢mide. in some of these beaches, surveys from 1972 and 2000 were compared in order to recognise differences in morphology in the last 28 years that could be assigned to dynamics or grain-size changes. the three beaches of buenos aires are mesotidal and subject to the action of incoming waves from the atlantic ocean. the macrotidal beaches of northern patagonia are placed within gulfs (san mat¨ªas, san jos¨¦ and nuevo). they are therefore fetch-limited, and oriented to the south (baliza san mat¨ªas, puerto pir¨¢mide) or to the north (playa larralde). all the mesotidal beaches are mainly composed of fine sand. only at the intertidal sectors of the balneario san cayetano and claromec¨® medium sand was sampled. dealing with macrotidal beaches of patagonia, gravel was collected at the berm crest of playa larralde, and shells were sampled at the storm berm of baliza san mat¨ªas beach. at the lower intertidal sectors of baliza san mat¨ªas beach very fine sands, probably related to the distal parts of ebb-tidal delta of san antonio bay, were recognised. the three beaches of buenos aires province extend 180- 200 m during low tide, and have wave heights of 0,4-0,7 m. on the other hand, those from northern patagonia extend 300-400 m, with wave heights of less than 0,3 m during low tide (fetch-limited). the beaches of baliza san mat¨ªas may have reflective dynamics during high tide.the sand would be partly supplied by the reworking of fossil beaches (from peninsula villarino) and is located close to the distal portions of the ebb-tidal delta of san antonio bay. a similar behaviour is expected at the gravel berm of playa larralde; the gravel was supplie
%K beaches
%K grain size
%K morphodynamics.
%U http://www.scielo.org.ar/scielo.php?script=sci_abstract&pid=S1853-63602001000100003&lng=en&nrm=iso&tlng=en