Abstract: Floating debris, which is commonly seen in water projects, affects the water quality, water landscape, water supply, fisheries, shipping, and power generation. Controlling floating debris in waterway would improve the project’s direct benefit and water environment. To reduce the influence of floating debris on the projects, measures including intercepting the floating debris by trash rack, discharging the floating debris by drainage holes, cleaning the floating debris by machinery and artificial approaches are taken. But these measures do not make full use of the river hydraulic characteristics, and the effect cannot meet the requirements. Hydraulic model test is a scientific approach to solve the floating debris problem. In the past, researches on controlling the floating debris were carried out in downstream of TGP and other dams. The transport, gathering, and retention are related with the river regime and project layout. By in-depth research on the characteristics of floating debris, the treatment effect can be improved.

Key words: waterway, reservoir, floating debris, water environment, measures of controlling floating debris