Resumo

MEDINA, Rubén A; MARTINEZ, Andrea L; MORMENEO, Liliana  e  RICHIANO, Sebastián M. Cambios morfosedimentarios causados por la construcción de un espigón en Camet Norte, provincia de Buenos Aires, Argentina. Rev. Asoc. Geol. Argent. [online]. 2016, vol.73, n.2, pp.270-279. ISSN 0004-4822.

Our study shows several morphodynamic changes occurred along a coastal sector downstream of a groin built at Camet Norte locality (Buenos Aires province) by the end of 2011. During the time span analyzed (July 2011-December 2015), at a control site located 200 m north of the structure, downstream relative to the littoral drift, it was possible to observe that the sand level on the beach was seldom higher than that recorded in July 2011, four months before the groin was built. The opposite occurred in other three control sites placed more than 1,275 m far from the new groin, where the sand level was seldom lower than that observed in July 2011. In addition, along the whole year, the size of the sandy particles of the foreshore in the area localized near the structure was generally higher than that of the remaining control sites, suggesting stronger wave energy within the corresponding coastal sector. Most probably, within control site localized next to groin coastal sector a lower sandy level together with stronger wave energy allowed a direct influx and effect of the waves during the whole time span. This is reflected by a stronger retreat of the main cliff and especially the microcliff, with a total of 96 and 350 cm (22 and 79 cm/year), respectively. These retreats are linked mainly to short marine events locally known as “sudestadas”.

Palavras-chave : Erosion; Cliffs; Littoral drift; Beaches; Groin.

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