The study on treating transverse slope and flow deflection angle as key navigability-affecting hydraulic parameters,supported by corresponding modeling simulations,remains relatively scarce.On the basis of different riverbed evolution scenarios of Qizhou Bend,a study is conducted on the hydraulic indicators hindering navigation including transverse slope and flow deflection angle,which represent Qizhou Bend hindering navigation.The applicability and reliability of these indicators are verified using a two-dimensional mathematical model for simulation and analysis.The conclusions,derived from research on hydraulic indicators and the feasibility of implementing regulation measures,simulate the transverse slope and flow deflection angle under five different working conditions (F1-F5).These simulated results are compared with field survey data.The results show that conditions F1-F4 slightly reduces the transverse slope(minimum 0.01‰ and maximum 0.05‰),thereby improving the navigation conditions in the obstructed channel,while the condition F5 shows negligible improvement.Similarly,conditions F1-F4 slightly reduce the flow deflection angle(minimum 0.03°and maximum 0.08°),enhancing navigation conditions,whereas the condition F5 has minimal effect.The optimal solution for improving the flow conditions in the obstructed waterway is the condition F2 plan (slope cutting and revetment at the upstream convex bank + a diversion dike at the concave bank).This solution provides the best improvement for sailing with difficulty and accident-prone area at cross-section S8,effectively reducing ship resistance to a certain extent and enhancing navigation safety.