Nonlinear Mechanism of Bed Load Transport
- 期刊名字:天津大学学报(英文版)
- 文件大小:
- 论文作者:XU Haijue,BAI Yuchuan,NG Chiu-
- 作者单位:School of Civil Engineering,Department of Mechanical Engineering
- 更新时间:2023-02-26
- 下载次数:次
From the group movement of the bed load within the bottom layer, details of the nonlinear dynamic characteristics of bed load movement are discussed in this paper. Whether the sediment is initiated into motion cor-responds to whether the constant term in the equation is equal to zero. If constant term is zero and no dispersive force is considered, the equation represents the traditional Shields initiation curve, and if constant term is zero with-out the dispersive force being considered, then a new Shields curve which is much lower than the traditional one is got, The fixed point of the equation corresponds to the equilibrium sediment transport of bed load. In the mutation analysis, we have found that the inflection point is the demarcation point of breaking. In theory, the breaking point corresponds to the dividing boundary line, across which the bed form changes from flat bed to sand ripple or sand dune. Compared with the experimental data of Chatou Hydraulic Lab in France, the conclusions are verified.
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