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Assessment of New Port Operations Using Integrated Analysis: A Case Study in Port of Mucuripe (CE, Brazil)

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Document pages: 20 pages

Abstract: This paper presents the analysis of Ship-to-Ship (STS) operations in both berths of the Mucuripe Port Oil Terminal (CE, Brazil). Since it is a new operation in this Terminal (that was not originally designed for), state of the art engineering tools was used to aid the analysis and to assure the safety of personnel and environment and integrity of structures and equipments. All the procedures are based on the PIANC Report n° 121-2014 detailed design phase. Initially, a hydrodynamic model was used to calculate the waves and current along all the access channel and sheltered area, for a long period (5 years). Calibration with in-loco measurements was done to assure the accuracy of the model results. A CFD model of the vessels in Ship-to-Ship configuration was used to calculate the current and wind forces in both hulls since most of the reference data is related only to single hull coefficients. Wave motions and loads are obtained using the potential software Wamit ®, with a careful analysis of the numerical mesh. An in-house mooring analysis software (Medusa) was then used to calculate the forces in the mooring lines and fenders for the ship-to-ship configuration, subjected to a large range of wind, waves, water level and current combinations. This software is fully configurable and can even model Ship-to-Ship vessels arrangements. It is also possible to perform statistical analysis of the results, indicating the availability of each berth for the STS operation. Different mooring layouts were tested. The nautical maneuver was performed and analyzed by real-time numerical simulations, with the command of the Mucuripe Port maritime pilots. Several scenarios of wind waves current were tested in the full-mission maneuvering simulator of the TPN Laboratory. The simulations intended to verify if the space to turn the vessel was adequate, considering that the other STS vessel was already at the berth. Furthermore, the bollard pull and the number of tugboats could also be tested, considering the risks associated to the STS operation. A novel procedure of Fast-Time simulation was applied to better define the required bollard pull, repeating the maneuvers executed by the pilots under a larger number of environmental conditions, using the computer to control the trajectory. An optimization algorithm associated with statistical analysis was the used to verify the tug boats bollard pull required for each case. If hydro meteo information and prediction system is installed in the port, these results could be used to optimize the allocation of the tugboats in the port. As a final result of the analysis, some restrictions were imposed on the STS operation when long-period waves reach the port since they cause large motions in the vessels and increase the load on the mooring lines.

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