Impact of Levee Axis Adjustment on Flow Variation in Xinsha Island

A two-dimensional flow model was constructed to assess the impact of levee axis adjustment on flow variation at Xinsha Island. The results indicate that the longer the return periods, the higher the water level in the southern waterway, with a maximum increase of 0.183 m. Conversely, the northern waterway exhibits a water level decrease, with a maximum reduction of 0.128 m. The flow velocity in the southern waterway diminished by roughly 0.3 m/s, but the flow velocity in the northern waterway rose by a maximum of 0.45 m/s. After the levee axis is adjusted, the flow diversion capacity of the north waterway is effectively enhanced, thereby benefiting flood regulation. Relationships between variations in upstream boundary discharge and flow variations surrounding Xinsha Island are presented to facilitate swift and dependable forecasts. These findings clearly illustrate the influence of levee axis changes on the hydrodynamic properties of the river.