Abstract:When double-line ship locks share a common approach channel for both irrigation and discharge purposes,the hydraulic system becomes susceptible to unsteady flow conditions.This phenomenon primarily stems from substantial water surface fluctuations within the approach channel,leading to complex flow patterns that significantly compromise lock operational reliability and navigation safety.In this study,the RNG k-ε turbulence model is used to analyze the hydraulic characteristics such as flow velocity,flow distribution and water level fluctuation at the inlet of the approach channel and the ship locks under different operation combinations when the ship locks share the upper approach channel with the Baishiyao double-line ship locks as the background of the project,in view of the unsteady flow problem generated when the ship locks share the upper approach channel.The results show that during the irrigation period,the flow velocity and water level fluctuations at the intake of the diversion channel are the most significant,and a local vortex is formed near the intake.When the double-line ship lock is operating simultaneously,the water flow conditions at the intake are even more complex,and even small-scale vertical vortexes appears,which have a significant impact on the water delivery conditions and the operation of the valves.By analyzing the unsteady flow law of the upper diversion channel and evaluating its adverse effects on ship navigation and berthing,it can provide a reference for the actual operation of the project.
