The port of Bushehr, located in southwestern Iran and serving as the capital of Bushehr province, has experienced significant economic growth driven by activities such as fishing, the operation of a nuclear power plant, shipbuilding, and exports. Access to the port is facilitated by two critical channels: the outer access channel in the Bushehr Gulf and the inner access channel in Khur-e Soltani. Dredging operations in the basins and access channels are essential for maintaining safe navigational depths, but they incur substantial operational costs. Effective long-term planning necessitates extensive temporal data and high spatial continuity to inform management and infrastructural decisions. This study involved simulating sediment transport in the Bushehr access channel using the numerical MIKE 21 model, with an emphasis on validating the accuracy of the results. The analysis utilized hydrographic data and historical dredging information from the years 1990 to 2000, as well as hydrographic data spanning 1998 to 2011. By examining past dredging activities, we gained insights into sediment deposition patterns across various segments of the channel, which proved beneficial for engineering evaluations and assessing the numerical model’s performance. The modeling results revealed that different sections of the access channel experience varying rates of sediment deposition. Notably, during high tide, the highest sediment transport rates were observed in the Khur-e Soltani and Lashkari areas. Furthermore, the section of the channel upstream of Abbasak Island exhibited a significant potential for sediment transport due to elevated tidal velocities. These findings underscore the necessity for tailored dredging and sediment management strategies. A comparative analysis of the modeling results against hydrographic data and previous dredging information demonstrated good agreement, confirming the model’s accuracy in predicting sedimentation rates.