ULCS Mooring/Propwash Analysis, Port of Oakland, CA

Vessel hydrodynamic modeling, dynamic mooring analysis and propwash modeling were performed upon request from Port of Oakland (Port) to assess the potential hydrodynamic impacts resulting from passage and operations of new ULCSs in the Middle Harbor (Berths 55/56 and 60-63) and Outer Harbor (Berths 35/37). Hydrodynamic modeling results indicate that forces on berthed containerships are larger in the Outer Harbor than in the Middle Harbor, where vessel motions and mooring line loads are expected to be within guidelines from PIANC and OCIMF, respectively, and that peak bollard and fender loads are expected to be within rated capacities. Results of propwash analysis for Berths 57-59 and 35-37 indicate that the propwash-generated bottom velocities along the under-pier slope are comparable between the Existing Vessel and Future Vessel. Results for Berths 60-63 indicate that the un-armored slope and berth area would be scoured by propwash generated by a future design vessel. Results for both passing vessel hydrodynamics and propeller wash impacts to slopes reinforce the crucial importance of hydrodynamic modeling for evaluation of ship maneuvering impacts in real port settings.