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論文投稿 A Comparative Study on Grain Size Analysis for Sediments Flowing into Reservoirs

作成年度 2012 年度
論文名 A Comparative Study on Grain Size Analysis for Sediments Flowing into Reservoirs
論文名(和訳)
論文副題
発表会
誌名 International Symposium on DAMS FOR A CHANGING WORLD -Need for Knowledge Transfer across the Generations & the World
巻・号・回
発表年月日 2012/06/01
所属研究室/機関名 著者名(英名)
水理チームHitoshi UMINO
水理チームNoriaki HAKOISHI
抄録
The objective of this study was to present an appropriate method for grain size analysis of sediments flowing into reservoirs. In the numerical simulation of reservoir turbidity, it is important to have accurate data on the particle settling rate. Laser diffraction is typically used for grain size analysis and the settling rate is converted by Stokes formula; however, it has been indicated that the settling rate calculated by this method differs from the actual rate. We conducted grain size analysis using three different methods, i.e., settling cylinder, centrifugal sedimentation and laser diffraction. A comparison of the results led to the following conclusions: (1) Settling cylinder was the most reliable method for obtaining the settling rate of fine particles. (2) Centrifugal sedimentation was a viable alternative to the settling cylinder method. (3) Laser diffraction provided grain size distribution similar to the settling cylinder method by applying supersonic distribution treatment.
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