MODELAGEM NUMÉRICA DE EROSÃO DA PRAIA DE PIRATININGA, NITERÓI - RJ POR AÇÃO DE ONDAS DE TEMPESTADE

Código

ENES20200069

Autores

RODRIGO AMADO GARCIA SILVA, João Cláudio Martins Cassar, LUIZ ABILIO DE BARROS GUSMÃO, Paulo César Colonna Rosman

Tema

02 - PROCESSOS HIDROSSEDIMENTOLÓGICOS E MORFOLÓGICOS EM AMBIENTES COSTEIROS

Resumo

The wave breacking zone is a region governed by complex hydrosedimentological processes. Beach erosion during storms is one of the main aspects regarding the study of beach morphodynamics. Such erosion is commonly caused by cross-shore sediment transport in virtue of the high energetic storm waves condition. This paper presents the use of a beach erosion model in the simulation of the morphodynamic response of Piratininga Beach (Niterói - RJ) to the action of storm waves. Severe erosion has been frequently observed at this beach during the last few decades. The modeling system SisBaHiA was applied to simulate the patterns of beach erosion observed at Piratininga during a storm occurred in June 1996. The applied nearshore processes model consists of a coupling between a 2DH hydrodynamic model, a sediment transport model and wave propagation models. The model results revealed complete erosion of the beach face at the eastern end of Piratininga Beach. This behavior is in accordance to the pattern observed in the reality and may be justified by the higher wave heights, as well as by the west directed longshore currents observed in that region, which remove sediment from that portion of the beach. Since the model was well succeeded in reproducing the expected pattern of beach erosion in response to the simulated storm, it seems to be a useful tool for assessing areas with potential risk of coastal erosion.