The navigable flow conditions in the estuary reach where the Yuxi River converges into the Yangtze River are complex due to the dual influence of upstream sluice operation and the water-sediment dynamics of the Yangtze River.A depth-averaged 2D hydrodynamic model is employed to analyze navigable flow parameters conditions such as water depth,flow velocity,and direction in the Yuxi River estuary.The influence of hub operation schemes on flow diversion ratio at the original meander reach is investigated by Pearson correlation coefficient analytical method.The results show that based on the current channel scale requirements,the designed navigation channel can basically meet the maintenance water depth requirement of 4.0 m,but there is a problem of insufficient water depth in local areas of the channel.The overall flow state of the engineering river section is directly controlled by the water level of the main stream of the Yangtze River and the operation and discharge status of the Yuxi Ship Lock.When the uplift effect of the main stream of the Yangtze River is weak and the discharge flow of Yuxi Ship Lock is small,the overall hydrodynamic conditions of the river section are relatively weak.There is a strong positive correlation between the original bend section and the total discharge of the hub,as well as the flow rate of the control gate,while there is a negative correlation with the filling and discharge volume from the ship lock.The research results can provide references for the safety of ships in the Yuxi estuary and offer theoretical support for the subsequent maintenance of the waterway.