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. This research aimed to map distinct types of echo-character in order to recognize estuarine sedimentary processes along the Piraque-Acu System, in Aracruz, Espirito Santo State, Brazil. Echo-character mapping was undertaken using high frequency sub-bottom profiling data. Four echo-character (EC1, EC2, EC3,EC4) patterns were recognized by combining sub-bottom and surficial sedimentological data. These EC patterns defined three distinct areas within the system that arecharacterized by the predominance of a specific echo-character and a seabed type: i) estuarine mouth, where sand beds with low penetration prevail; ii) a transitionzone, where sandy-muddy andmuddy-sandy beds are associated with a high penetration echo-character; and, iii) the rivers/estuary Piraque-Ac¸u and Piraque-Mirim withsandy-muddy and muddy beds with high penetration echo pattern. The interpretation showed that the association of EC and surficial sediment may represent modernsedimentary processes within the estuary. Three sedimentary processes were recognized: a) marine dominated processes showing sand transport by tidal currents;b) estuarine processes with fine sediment input, resuspension and deposition; and c) erosive estuarine processes or scour lags, exposing possibly relict deposits. Keywords: estuarine sedimentation, shallow geophysics, sub-bottom profiler. RESUMO. Esse estudo busca reconhecer os tipos de ecocarater existentes para o melhor entendimento dos processos sedimentares do sistema estuarino do Piraque-Acu e Piraque-Mirim, localizado no municipio de Aracruz, Espirito Santo. O reconhecimento e o mapeamento dos tipos de ecocarater foram realizados a partir deregistros de perfilador de subfundo de alta frequencia. Atraves da associacao dos dados geofisicos com dados sedimentologicos foram reconhecidos e definidos quatropadroes de ecocaracteres (EC1, EC2, EC3, EC4) associados a tipos de fundo distintos. A distribuicao espacial dos tipos de eco permitiu a divisao do estuario em tres areas distintas que diferem pela predominância de diferentes tipos de ecocarater e sedimento: i) A foz do sistema estuarino, interpretada como regiao de domiâancia marinha, onde predomina o fundo arenoso e a baixa penetracao do sinal; ii) A zona de confluencia, onde predomina sedimentos areno-lamosos a lamo-arenosos compenetracao do sinal acustico; iii) Os bracos Piraque-Acu e Piraque-Mirim de predominio de fundo areno-lamoso a lamoso, com penetracao do sinal. Estas areas estao associadas a distintos processos sedimentares, sendo eles: a) processos marinhos com transporte de sedimentos arenosos por correntes de mare (foz do sistema ate a confluencia dos bracos); b) processos estuarinos com aporte, resuspensao e deposicao de sedimentos finos, tipicos da regiao interna do sistema; e c) processosestuarinos erosivos ou de ravinamento, ocorrendo localmente nos bracos. Palavras-chave: sedimentacao estuarina, geofisica rasa, perfilador de subfundo

revista brasileira de geofísica

INTERPRETATION OF SEDIMENTARY PROCESSES USING ECHO-CHARACTER DISTRIBUTION: CASE STUDY OF PIRAQUÊ-AÇU AND PIRAQUÊ-MIRIM ESTUARINE SYSTEM, ARACRUZ – ES (BRAZIL)