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The altimetric adjustment of topographic beach profiles to the mean sea-level can be done extending the profiles down to the point of maximum backwash of waves at the beach face and relating the sea height at the moment of observation with local mean sea level, according to the nearest available tide table prevision as suggested by Bigarella et al. (1961). With the purpose to verify the consistence of the method for different beach profiles located at the same position as also for profiles located along a beach arc, the vertical references established in two distinct expeditions to the Pontal beach at the Southern border of the Espirito Santo State (Southeast Brazil), were compared with the vertical reference established under very calm wave and wind conditions, indicating that under small waves the differences were acceptable considering the low precision required for this kind of survey, while under high waves the error became too large. For this reason, establishing an unique vertical reference level, determined under favorable oceanographic conditions, is fundamental to allow an adequate comparison between beach profiles measured at different periods or different positions as also for coupling the sub aerial profiles to the submarine zone.

Avaliação de Método Expedito de Determinação do Nível do Mar como Datum Vertical para Amarração de Perfis de Praia