Experimental study on bed forms and flow resistance of light-weight materials with different densities

Experiments were conducted to investigate the bed form and flow resistance of the light-weight sediment in an open channel flow. Three different synthetic materials with specific gravity 1.055, 1.46 and with uniform sizes D₅₀ 1.25mm, 1.05mm, 1.40mm were used. Some conclusions were obtained from experimental results and the data of other reliable references. The conclusions indicate that the grain resistance is greatly affected by D₅₀, and the bed form resistance is the function of the downstream slope and height of dune As well as natural sand, Y is not only the function of Y', but also affected by the relative roughness Rb/D₅₀ and the size of used sediment.