Resumo

ISLA, Federico et al. Requirements and availability of sand for theprotection of Nechochea and Lobería beaches. Rev. Asoc. Geol. Argent. [online]. 2009, vol.65, n.3, pp.446-456. ISSN 0004-4822.

Thecoast of Lobería and Necochea is characterized by cliffsand narrow beaches. Theinlet of the Quequén Grande river used to alter the coastline. The constructionof jetties related to the Quequén Harbour induced huge accumulations of sandtowards Necochea, and a critic erosive process of cliff and beach to the east.Beach width reduces from 300 m at the west to 40-60 m to the east. Consideringregional sand scarcity, the eastern beaches are characterized by more sandvariability. Greater variations in the sand balance were assigned to humanactivity. Waves coming from the E, SE and S deliver more energy along thiseastern sector. On the other hand, submerged zones of these beaches have lessavailability of sand. Greater availability of fine sand was recognized towardsNecochea. The Quequén Grande river has much effect on the estuarine dynamicsduring ENSO-triggered floods, although sedimentation is dominated by siltsupply.

Palavras-chave : PuertoQueqén; Erosión; Acción antrópica; Protección; Playas; Quequén Port; Erosion; Anthropic activity; Protection; Beaches.

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