Abstract: Reservoir sedimentation is a worldwide problem which affects the normal functioning of flood control,power generation,shipping,and water resources utilization. In particular,sediment deposition in front of dam may block the water intake of hydropower station and bottom outlet,severely affecting the power generation efficiency and flood discharge safety. The water depth in front of the dam of large reservoirs is generally over 100 meters. Efficient and safe dredging is an important approach to effectively control sediment deposition and maintain sustainable development of water resources. In this paper,the aerodynamic deep-water dredging technology is studied and applied to the Three Gorges Reservoir. Application result manifests that aerodynamic dredging technology can be operated safely and efficiently in 100-meter deep water environment. The research results can be taken as a technical reference for the dredging of large reservoirs.

Key words: deep water dredging, aerodynamic, reservoir sedimentation, dredging cost, Three Gorges Reservoir