Análise das flutuações do nível do mar no litoral De Santa Catarina

Sea level fluctuations on the coast of Santa Catarina during the fall of 2018 were studied to evaluate the contribution of the meteorological tidal phenomenum in comparison with predicted astronomical tides. The time series of the open sea tidal stations (Ilha da Paz, Balneario Camboriu, Imbituba and Balneario Rincao) were quality controlled, interpolated at 15-minute intervals and standardized by mean sea level. The storm surge, evaluated in the inertial scale, presented amplitudes of 30 to 40cm in relation to the mean sea level and occurred in periods ranging from 5 to 10 days, corresponding to the temporal scale of the frontal atmospheric systems. There has been a reduction in the amplitude of astronomical tides towards the south of Santa Catarina, so that the relative contribution of the storm surges to sea level variation exceeds 90% in extreme cases. Based on these results, caution is advised in the use of astronomical tidal tables, especially for coastal navigation on inbound and outbound vessels in estuaries, bays and inlets.