The Da-Bu dam and Da-Bang dam, located upstream of Zengwun Reservoir, were selected as study areas. Application of the Hydrologic Engineering Center’s River Analysis System (HEC-RAS) to simulate river scouring deposition behavior was combined with with-dam and without-dam scenarios with different settings for sediment particles and runoff. The results were used to discuss possible applications of river scouring deposition characteristics for the planning and design of river engineering structures.Characteristic diagrams of scouring deposition depths were proposed based on simulated results for multiple intermediate diameters (d50) and various runoffs of recurrence periods, which can be used as a tool to investigate the sediment scouring deposition behaviors of river sections. The results indicated that these diagrams not only responded to sediment scouring deposition properties in multiple scenarios but also provided a tool for determining optimal locations for engineering structures and dimensions for disaster prevention. In addition, the diagrams were able to respond to variations in river scouring deposition caused by dam construction and thus could serve as a reference for the planning and design of disaster-preventive structures.
Key Words: Characteristic diagram of river scouring and deposition, scenario simulation, engineering planning and
design.