Laboratory analysis of incipient motion velocity for non-uniform non-cohesive sediments movement in rectangular flumes

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• 作者：Najafi-mood Mohammad Hossein ; Khozeymehnezhad Hossein…
• 关键词：Incipient motion velocity ; Non ; uniform non ; cohesive sediment ; Slope ; Rectangular flume
• 刊名：Arabian Journal of Geosciences
• 出版年：2016
• 出版时间：January 2016
• 年：2016
• 卷：9
• 期：1
• 全文大小：984 KB
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• 作者单位：Najafi-mood Mohammad Hossein (1)
  Khozeymehnezhad Hossein (1)
  Mazloom-shahraki Rasoul (2)
  
  1. University of Birjand, Birjand, Iran
  2. Irrigation and Drainage of University of Birjand, Birjand, Iran
  
• 刊物类别：Earth and Environmental Science
• 出版者：Springer Berlin Heidelberg
• ISSN：1866-7538

文摘

The moment when sediment particles start to move is known as incipient motion of sediments. Many studies have been conducted to determine the incipient motion velocity of uniform non-cohesive sediments across open channels with a positive slope, and some equations and diagrams have been proposed in this regard; however, studies carried out on the non-uniform non-cohesive sediments, especially with the reverse slope, are very few. In this study, a lab flume and the dimensional analysis were used to analyze the inception motion condition of non-uniform non-cohesive sediments. In this study, a number of nine samples of non-uniform non-cohesive sediments with different sizes and uniformity coefficients were analyzed through three positive slopes 0.0005, 0.001, and 0.002 and also through three reverse slopes 0.0005, 0.001, and 0.002. The results indicated that particle stability is decreased with increasing the positive slope, whereas it is increased with increasing the reverse slope. The results also showed that particle鈥檚 stability is decreased with increasing the particle size, whereas it is increased with increasing the uniformity coefficient of sediments. Keywords Incipient motion velocity Non-uniform non-cohesive sediment Slope Rectangular flume