The fundamental tool of this study is the two and three-dimensional modeling software DELFT 3D. It was used to model the hydrodynamic processes of the harbor of San-Pédro (Côte d’Ivoire) and its immediate marine environment, with the input parameters such as tidal variations in tides and river flows, as well as average annual wind speeds. Studies focused on the behavior of current fields, water level variation, and the nature of the tidal wave. The calibration of the model followed by an analysis of the literature led us to choose a coefficient of 0.03 m-1/3.s, with which the model performs very well. Current fields tend to follow the wind direction, parallel to the coast at sea, while they fit the morphology of the roadstead. At sea, currents are exclusively linear at low water, and exceptionally gyratory at flood stage in front of the San-Pedro river outlet. In the roadstead, they are gyratory and linear, alternating in some places and permanently gyratory in others. The shape of the current also depends on its speed, with a limit of 1.5 cm/s for the appearance of gyratory currents at lower speeds. The current speeds in the roadstead are between 0 and 6 cm/s while at sea they are between 5 and 11 cm/s, exceptionally between 10 and 34 cm/s in front of the outlet. As water level variations are highly dependent on tide and season, they are greater in the roadstead (4cm on average) than at sea. The wave is stationary in roadstead, with the existence of the seiche phenomenon, and progressively dominant at sea. The seiche wave determines the directions of entry and exit of water from the roadstead, with low tide corresponding to an outflow of water and high tide, a period of transition between the ingress and egress of water from the roadstead.