Given that liquefied natural gas (LNG) terminals require large quantities of seawater as a cold source during operation,the construction of water intake and drainage projects is particularly important.Water intake and drainage activities inevitably have an impact on the flow field of the adjacent water areas of the project.Therefore,it is necessary to conduct a systematic analysis of the tidal current field near the project.This study takes the Yingkou LNG terminal project as an example and utilizes the open-source hydrodynamic numerical model FVCOM to simulate and compare the hydrodynamic characteristics of the tidal current field within the port area before and after the implementation of the water intake and discharge project of Yingkou LNG terminal.The focus is on investigating the impact of water intake and drainage outlet construction on the nearby three-dimensional flow field.The simulation results indicate that after the project implementation,there are slight changes in the surface and bottom flow velocity amplitudes of the tidal field near the water intake and drainage outlet,but the maximum change in surface flow velocity does not exceed 0.05 m/s.By analyzing the surface cross-flow velocities at typical measurement points within the port area,it is found that the maximum difference in cross-flow velocity among the characteristic points does not exceed 0.016 m/s.In summary, the implementation of water intake and drainage engineering has a very limited impact on the hydrodynamic characteristics of the tidal field in the study area,especially on the overall distribution pattern of the tidal field,which has not undergone significant changes.The research results can provide reference for the design and evaluation of similar engineering in ports.