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The present paper summarizes the results of previous studies, including the structure and principle of the rotaryring flume for researching the fine sediment movement, the mechanism of the flume, method of eliminating the influence ofthe centrifugal force and sediment movement experiments with periodic alternating current. Also included are the experi-ment-based relationship among sediment concentration, bed shear stress and silt carrying capacity, a proposed erosion-depo-sition function and bed erosion-deposition calculation together with the results of verification.