The Three Gorges Reservoir's water storage operation has led to a riverbed reshaping process in the Jingjiang River section of the middle reaches of the Yangtze River,resulting in significant scouring and silting adjustments of the riverbed.The Majiazhai Waterway,as one of key waterways,requires a comprehensive analysis of its riverbed evolution to understand changes in navigation conditions.We utilize the prototype observation data from the Majiazhai Waterway over the years to conduct a comprehensive analysis.The results indicate that the waterway has a single channel with a relatively narrow main channel,offering favorable navigation conditions.The scouring caused by the clear water discharge from the Three Gorges Reservoir is continuously developing.For the foreseeable future,this river section will continue to exhibit characteristics of scouring as the main change.Under normal hydrological years,the scouring will be slow,and during years with major floods,the right bank beach may experience scouring and downstream movement,with the tail end being dispersed.However,due to the limited river width and the limited scale of the beach,the impact of scouring on the river channel and navigation is generally controllable.