Journal of Changjiang River Scientific Research Institute ›› 2017, Vol. 34 ›› Issue (7): 7-11.DOI: 10.11988/ckyyb.20160402

• RIVER-LAKE SEDIMENTATION AND REGULATION • Previous Articles     Next Articles

Research on Sediment Incipient Velocity Based on Probability Statistics Theory

WU Zhang-song1,2, ZHANG Gen-guang1, KOU Tan3, GAO Yuan1, LI Lin-lin1   

  1. 1.College of Water Resources and Architectural Engineering,Northwest A & F University,Yangling 712100, China;
    2.Yunnan Water Resources and Hydropower Construction Engineering Technology Development Co., Ltd., Kunming 650021, China;
    3.Administration Bureau of the Second-period Pumping Water from Yellow River Project, Weinan 714000, China
  • Received:2016-04-26 Published:2017-07-01 Online:2017-07-01

Abstract: In order to fully reflect the randomness of sediment’s incipient movement, we deduced a formula of incipient velocity suitable for both coarse and fine grains by using a sediment rolling initiation model based on the probability density distribution of dimensionless exposure degree of the grains. The stochastic characteristics of instantaneous flow velocity and sediment particle arrangement on a bed surface were also considered in this paper. Then, the incipient velocities calculated by the proposed formula were compared with measured data and those by several classical incipient velocity formulae. The results show that the incipient velocities calculated by the proposed formula are in more agreement with the measured data than those calculated by the classical formulae. Therefore, the proposed formula’s reliability and superiority in predicting incipient movement of coarse and fine sediment are testified.

Key words: sediment, incipient velocity, exposure degree, instantaneous velocity, probability statistics

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