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Wind wave climate change: Impacts on the littoral processes at the Northern Buenos Aires Province Coast, Argentina

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Abstract

Several works reported wind-wave climate changes at Buenos Aires Province continental shelf. The aim of this work is to investigate the impact of these changes in the coastal processes of the region. This study is carried out by means of visual wave parameters gathered at the surf zone of Pinamar and by a conveniently implemented and validated numerical wave model (SWAN). Numerical results corresponding to a grid point located 30 km off Pinamar show a significant increase of wave heights from the S and SSE directions and in the frequency of occurrence of waves coming from the S, SSE and E. It is shown that these slight offshore appreciated trends would not have significant effects on the breaker heights observed at the surf zone at Pinamar. On the contrary, the slight positive trend observed offshore in the frequency of occurrence could be affecting the incidence of waves onshore, producing an increase in the number of cases of normal incidence at the surf zone and, consequently, a significant decrease in the alongshore wave energy flux assessed at Pinamar. This reduction in the alongshore wave energy flux could be responsible for some coastal changes detected in the region as, for instance, the remarkable shortening of Punta Rasa spit located 70 km northward Pinamar.

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Acknowledgments

This paper is a contribution to the CONICET PIP 112-200801-02599 and 112-201101-00176 projects.

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Correspondence to Walter C. Dragani.

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Dragani, W.C., Martin, P.B., Alonso, G. et al. Wind wave climate change: Impacts on the littoral processes at the Northern Buenos Aires Province Coast, Argentina. Climatic Change 121, 649–660 (2013). https://doi.org/10.1007/s10584-013-0928-8

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  • DOI: https://doi.org/10.1007/s10584-013-0928-8

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