Efeito da construção de um quebramar sobre os processos morfodinâmicos e sedimentares na enseada dos anjos, Arraial do Cabo, RJ

Abstract

The present work studies the morphodynamic implications caused by the construction of a jetty to protect the crafts in do Porto do Forno, dos Anjos Sound, Arraial do Cabo, RJ, Brazil. To understand the variations caused by the jetty pier, we raised previous and later data to its construction such as photography, bathymetric charts , and other information. Several studies and information resulted from the material raised, like: sampling, sediment comparison and analysis, production of grain-size and sedimentary facies map, beach profiles, morphodynamic parameters, bathymetric digitalization and analysis, analysis of the variation of the coastal line at different times, study of the balance in plant, waves refraction analysis and evaluation of ripple marks. The conclusions were convergent, and the processes and parameters ratified the results and quantified the modifications. This indicated that the jetty altered several natural processes. They include the distribution of the wave energy gradient, the sedimentation and grain-size dynamics, erosion and acrescion local effects, inoperability of anchorage sites, change in the marine currents, bathymetric alterations and finally the impact on the sound scenario.