In response to the issues of large intersection angles between the centerlines of the upstream and downstream approach channels of the newly-built ship lock at the Jinjiang Yaoshan Hub and the river course,together with narrow river channels and short transitions,an experimental study on the optimization of the ship lock layout scheme is conducted by means of ship lock navigable flow condition tests and self-propelled ship model tests,and targeted measures for improving the flow conditions are proposed.The test results indicate that the adoption of permeable flow-isolating dykes in the upstream reach can enhance flow permeability,balance the velocity difference between the approach channel and the main navigation channel,and reduce the flow velocity gradient.After optimizing the length and height of the separation dike,the direct scouring impact of the mainstream on the lock entrance area is mitigated,and the adverse flow patterns such as cross-currents and backflows in the entrance area of the approach channel are effectively attenuated.In the downstream reach,adjusting the riverbed slope can improve the tailwater flow pattern,while connecting the downstream channel to the dredged zone for additional energy dissipation can buffer the downward-discharging flow.These combined measures effectively improve the navigable flow conditions of the Yaoshan ship lock,providing a technical reference for the layout design of ship locks in S-shaped curved river reaches.Ship model tests show that when the maximum navigable discharge is 160 m3/s, ships can maintain stable heading while passing through the entrance areas of the upstream and downtream approach channels and the transition sections.Parameters such as rudder angle and drift distance all meet the standards,ensuring reliable navigation safety.