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泥沙悬浮是湍流猝发直接作用的结果．本文基于这一力学机理，利用湍流猝发平均持续时间和猝发强度构造明渠流悬沙湍流扩散模式．模式涉及的唯一参数线性地随悬沙沉降速度对摩阻流速的比值增大而增大，表征较粗、较重的泥沙颗粒的悬浮需要具有更多能量、持续时间更长的湍流猝发作用与之相适应，物理意义明确．经水槽实验资料验证，本模式可精确模拟悬沙浓度沿垂线的分布．对类似流动中其它异质污染物的湍流扩散，该模式有直接的应用价值
Sediment suspension is a direct result of turbulent burst. Based on this mechanistic mechanism, this paper constructs the turbulent diffusion model of open channel flow based on the average duration of the turbulent bursts and the burst intensity. The only parameter involved in the model linearly increases as the ratio of suspended sedimentation velocity to friction velocity increases. Characterization of coarser, heavier sediment particle suspension requires more energy, longer duration turbulent burst action Correspondingly, the physical meaning is clear. The experimental data through the sink verified that this model can accurately simulate the distribution of suspended solids concentration along the vertical. This model has direct application value to the turbulent diffusion of other heterogeneous pollutants in similar flow