Yalu River upstream Jiuduizi Waterway is characterized by complicated river trend and extremely poor flow regime.It is one of the typical navigation-obstructing shoals.Control plan is set according to actual plane form,flow condition,water flow condition and control principles.Surface water simulation software SMS is utilized for simulating the control plan effect in detail.Waterway condition of Hujiatan River section is improved by the plan from the perspective of control effect.Navigation depth and width ...