| Resumo: | Downtime at ocean facing ports is often related to excessive moored ship motions caused by wave action. This paper discusses the influence of local conditions on the operational problems at Berth A of Leixões Oil Terminal, Porto, Portugal, and analyses the efficacy and suitability of selected interventions, either on the north breakwater or on the mooring system, to reduce the amplitude of moored ship motions. Mooring practices are also analysed. It was concluded that friction forces at the interface between the ship and the fenders have a significant effect on the moored ship response and effectively reduce ship oscillation amplitudes (especially the surge); while a slight modification of the mooring arrangement has a negligible influence on the ship behaviour. In addition, modifications to the harbour breakwater configuration taking into account local conditions improved Berth A operational conditions.
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