Comparação de metodologias para a determinação de movimentos verticais do navio na definição da Profundidade de Projeto de Canais

Abstract

In recent decades, there has been a substantial increase in the dimensions and draughts of ships, which has placed some pressure on the infrastructure of port access, which, in turn, has been adapting its navigation channels in order to facilitate the accessibility of such ships. The purpose of this work is to quantify the main factors that contribute to the vertical movements of the ship during the entry and exit transit and its contribution to the composition of the depth, in order to quantify the safety level of the Project Depth selected in straight stretches of the Navigation Channel. For this, deterministic methodologies applied worldwide and predetermined data, defined as “Design Criteria”, were employed to calculate maximum “squat effect” and “maximum wave-induced vertical movement”, allowing to quantify the “Calculated PP”. The “Calculated PP” was then numerically compared to the “Selected PP” in three pre-selected straight sections of the Navigation Channel, and the safety factors intrinsic to the ship's entry and exit transits were individually calculated, separately, in each section. The results obtained served as a verification tool for the selection of the “Project Depth” in a port maritime access Navigation Channel located in the South-Southeast region of Brazil. While both the transits in the “Initial” and “Final” sections and the exit transit of the “Intermediate” section have demonstrated to be an adequate selection for the Project Depth, the same was not confirmed for the entrance transit in the “Intermediate” section, as a minimal adequate safety factor was not identified to comply with the conditional UKC requirement.