Levantamento de embarcações de pequeno porte comuns na Região Amazônica e estudo da resposta em ondas de uma embarcação do tipo voadeira

Abstract

It is possible that the Brazilian Amazon has one of the largest concentrations of small boats in Brazil, mainly due to the lack of roads and the need for water transport of people and cargo between different cities. Many of these vessels, registered or not registered by the maritime authorities, can reach high speeds, making it necessary to further study to characterize their hydrodynamic behavior. This work aims to contribute to the classification of small, motorized vessels, typical of the Amazon region, and to carry out an analysis of the behavior on regular waves of a regional vessel known as “voadeira”. The main objective is to evaluate the possible movements that a ship of this type can present in wave conditions, without propulsion. These conditions may occur during adverse climatic events, common in the region, as they may generate eventual waves on the surface of the rivers. For the survey of vessels, the city of Itacoatiara, in the State of Amazonas, was considered as the representative location for the study. A voadeira type vessel was selected as a case study. The ship's hull was modeled using computer-assisted design and its response in waves was investigated using hydrodynamic potential theory methods. We investigated the effect of the variation of the angle of incidence of the waves and the vertical position of the center of gravity of the resulting movements. The results allowed determining the most significant movements, including the wave frequency that may cause them. The rotational movements show significant increases for different wave conditions. The methodology presented can be extended to evaluate other regional vessels.