The Tiaoguan Waterway in the lower Jingjiang River has the typical evolutionary characteristic of “concave bank deposition and convex bank erosion” in meandering river segments,causing the progressively tightening bend radius and increasing navigational risks in the curved channel section.On the basis of measured topographic data of the Tiaoguan Waterway from 2002 to 2021,the evolutionary patterns and navigation-impeding characteristics of the waterway are systematically analyzed,and future trends are predicted.The treatment measures are proposed involving the stabilization of the Jijiazui Point Bar,and are verified by model test.The results indicate that the middle and upper sections of the Jijiazui Point Bar on the convex bank experience erosion,while the lower section undergoes deposition and downstream extension,leading to reduced stability of the channel and bar.On the concave bank,the development of mid-channel bars and flow division into two channels,coupled with the deposition and downstream extension of the convex bank,exacerbates the tightening bend radius in the curved section.Additionally,turbulent flow near the Tiaoguan Jetty and the recirculation zone at the tail of the Jijiazui Point Bar further deteriorate navigational conditions.The treatment measures involving the stabilization of the Jijiazui Point Bar by constructing three submerged dikes spaced along the bar and protecting the high beach shoreline at the root of the bar can promote a smooth channel-bar morphology,stabilize the left boundary of the curved channel,inhibit the formation and development of chute channels at the root,and effectively improve channel width and bend radius,meeting the design standards of 4.5 m×200 m×1,050 m (depth×width×bend radius).