Volume 8 Issue 1
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Hao WANG, Hong-wu TANG, Han-qing ZHAO, Xuan-yu ZHAO, Sheng-qi Lü. 2015: Incipient motion of sediment in presence of submerged flexible vegetation. Water Science and Engineering, 8(1): 63-67. doi: 10.1016/j.wse.2015.01.002
Citation: Hao WANG, Hong-wu TANG, Han-qing ZHAO, Xuan-yu ZHAO, Sheng-qi Lü. 2015: Incipient motion of sediment in presence of submerged flexible vegetation. Water Science and Engineering, 8(1): 63-67. doi: 10.1016/j.wse.2015.01.002
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Incipient motion of sediment in presence of submerged flexible vegetation

doi: 10.1016/j.wse.2015.01.002

  • State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering, Hohai University, Nanjing 210098, P. R. China

Funds:  This research was supported by the China National Funds for Distinguished Young Scientists (Grant No. 51125034), the State Key Program of the National Natural Science Foundation of China (Grant No. 51239003), and the National Natural Science Foundation of China (Grants No. 51109066 and 51109065).
More Information
  • Corresponding author: Hong-wu TANG
  • Received Date: 2013-12-23
  • Rev Recd Date: 2014-05-28
    Abstract
  • The presence of submerged vegetation on river beds can change the water flow structure and alter the state of sediment motion. In this study, the incipient motion of sediment in the presence of submerged flexible vegetation in open channels was investigated in a laboratory experiment. The vegetation was simulated with flexible rubber cylinders arranged in parallel arrays. The effect of the vegetation density, water depth, and sediment grain size on the incipient motion was investigated. The experimental results indicate that the incipient motion velocity of sediment increases as the vegetation density decreases and the water depth and sediment grain size increase. With flexible plants, the incipient motion velocity of sediment is lower than it is without vegetation, and is larger than it is with rigid vegetation. A general incipient motion velocity equation was derived, which can be applied to both flexible and rigid vegetation conditions.

     

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