Abstract
Long term persistence of high turbidity water is one of the major water quality issues in rivers with a dam reservoir. This phenomenon is influenced by the grain size of fine sediment carried by floodwater into the reservoir. In his paper, analysis methodology of grain size distributions of fine sediment is discussed to propose the most proper method. Three analysis methods -sedimentation experiment in a tall tube, laser diffraction-dispersion method and centrifugal sedimentation method- are applied to several kinds of fine sediment sampled from river water and reservoir bed and the results are compared. From the results, laser diffraction-dispersion method with preprocess of sonication is proposed as most suitable for practical analysis of fine sediment in river water.
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