SPACE-TIME VARIABILITY OF EROSION/ACCRETION IN THE BEACHES OF THE BEACHES OF THE NORTHEAST OF BUENOS AIRES PROVINCE, ARGENTINA VARIABILIDAD ESPACIO-TEMPORAL DE LA EROSIÓN/ACRECIÓN EN LAS PLAYAS DEL NORDESTE DE LA PROVINCIA DE BUENOS AIRES, ARGENTINA

ALONSO, GUADALUPE; CODIGNOTTO, JORGE; BACINO, GUIDO; DRAGANI, WALTER

Revista Geografica de Chile Terra Australis

Instituto Geografico Militar de Chile

Año: 2021 vol. 57 p. 3 - 11

0378-8482

Buenos Aires Province productivity has critical importance for the regional economy, and its coasts receive more than a million tourists every year. However, data and studies on the evolution of its beaches are very scarce. The morphology of sandy beaches is naturally dynamic and shows temporal variations at various scales. On top of that, the beaches of the northeast coast of the Buenos Aires Province have various sources of anthropogenic pressure that add complexity to coastal studies. In this work, the temporal evolution of the beaches in six sites located in the northeastern coastal sector of Buenos Aires is studied. For this, monthly and systematic records of beach profiles surveyed between 2011 and 2016 were analyzed. Beach slope and cross-shore extension variability for each location were studied. In this work, an indicator called “foreshore volume” was defined. The objective of this indicator was to quantify the erosion/accretion status of each surveyed beach. The results obtained in this work indicate that the sediment balance in the analyzed sites is not uniform, finding stable beaches, or in a state of accretion or erosion. It could be seen that the sediment balances obtained are mainly related to the geographical orientation of the coast, rather than to the anthropogenic pressure of each site.