Analyzing the hydraulic design for the new basin in the IJmuiden outer harbor

To improve the lightering conditions of bulk carriers in the outer harbor of IJmuiden, the lightering facility will be transfered to a new harbor basin that will be implemented at the location of the dredging depot in the former Averij harbor. The Dutch Directorate-General for Public Works and Water Management (RWS) demands that down time of the lightering operations inside the new basin does not exceed 5% of the operating time of 365 days a year, 24 hours a day. Down time of the lightering operation can be caused by several issues. This thesis investigates the contribution of long waves with wave periods between 10 and 250 seconds to the down time conditions. Theoretically this long wave climate can cause high ship response as incoming wave periods are close to the bulk carrier's natural periods. The long waves can also cause resonance in the new basin or in the outer harbor as a whole. A coupled system of basin resonance and ship response is also investigated as the two separate resonance systems can enforce each other for certain wave periods. Investigating a 200.000 DWT bulk carrier's Response Amplitude Operators for an open water situation concludes that the bulk carrier experiences enforced movement in its horizontal motions for wave periods around 250 seconds and in its vertical motions for wave periods between 15 and 20 seconds. In the real time situation the ship's horizontal motions will be damped by the mooring system and the high resonance periods will not be met. The numerical wave model PHAROS has been used to analyze whether resonance patterns arise in the outer harbor basins for a wave period band between 10 and 250 seconds. It is concluded that the new basin can experience resonance for wave periods between 100 and 250 seconds. The highest wave amplification of 4.5 times the incoming wave height at sea occurs for an incoming wave period of 147 seconds. The amplified wave height inside the new basin will not contribute to down time conditions as the amplified wave height is lower than the critical wave height of 0.80 meter. The implementation of the new basin has a positive ffect on the area of the outer harbor behind the Fort island. Especially in the Hoogoven harbor and at the Noorder ship lock wave agitation decreases. However, standing waves may arise between the new basin and the opposing IJmond harbor if sufficient wave energy is present in the incoming wave climate. The results of the coupled system of basin resonance and bulk carrier vertical response do not result in a contribution to the down time criteria. Although amplified waves can become a factor 4.5 larger than the incoming wave heights, earlier investigation and observations and analyses in this study show that the incoming wave energy for long waves is low and the probability of incoming waves amplifying into waves of critical wave heights that cause down time to the lightering process is very little. The contribution to the down time of the new basin is very small in comparison to the contribution of wind and locally generated wind waves.Ports and WaterwaysHydraulic EngineeringCivil Engineering and Geoscience