Erosión en la bahía de Samborombón y cambios en la dirección de los vientos, provincia de Buenos Aires, Argentina

Erosion at the Samborombon Bay and changes in wind direction, province of Buenos Aires, Argentina. A slight southward shift of the South Atlantic semi-permanent high pressure system and an intensification of the eastern wind at the Rio de la Plata have been documented by several authors. A mild wind wave height increase has been detected at the Rio de la Plata and the adjacent continental shelf, from 1970 to the present, as a consequence of the aforementioned climate variability. The most noticeable increase was observed between the 80’and 90’decades, in good agreement with a general increment of erosion at Samborombon Bay and neighboring areas. The annual mean wave height was investigated using numerical simulations. The highest differences in wind wave heights (0.20 m, 9%) were observed at 34° S - 48° W, approximately. The increase was a little lower (7%) at the continental shelf and the Rio de la Plata. The annual mean of the simulated wave height showed significant positive trends at the Rio de la Plata mouth, the Uruguayan coast and Mar del Plata. The wind wave energy density (annual mean, averaged at the computational domain) also presented a significant positive trend and a relatively high inter-annual variability. From the analysis concludes that overall the shoreline has retreated about 50 m in the last 49 years at Samborombon Bay.