3-D numerical simulation of navigable flow conditions between Three Gorges Dam and Gezhouba Dam

The reach between Three Gorges Dam and Gezhouba Dam is one of the most difficult waterways for navigation from Yichang to Chongqing.With the establishment of the numerical model for 3-D flow,the 3-D flow field in this reach is calculated and the navigable area is analyzed according to the calculated results and navigable conditions.The result shows that this reach can basically satisfy the navigable conditions of the 10-thousand-tons fleet when the discharge is no more than 25 000 m³/s; on the contrary,danger area will appear and navigable conditions will be deteriorated as the discharge increases.If the standard for navigation can be properly raised,the flux for navigation shall increase to 45 000 m³/s.