挟沙水流的混掺长度初探

Study on the Mixing-length of Sediment-laden Flow

本文将挟沙水流近壁区视为由浓度梯度造成的层结流体，与大气边界层非中性平衡条件下温度梯度造成的层结流体相比拟．引入大气边界层的混掺长度作为挟沙水流近壁区的混掺长度．进而在从总切应力平衡式导出的流速梯度基础上，推导出挟沙水流沿整个水深的混掺长度公式，水槽资料证明了该公式的正确性以及挟沙水流近壁区与大气边界层的相似性．

The paper regards the sediment-laden flow near the bed as a stratification flow resulting from concentration gradient,and analogizes the atmospheric stratification flow caused by temperature gradient.Citing the mixing-length of stratification flow.the paper has deduced the velocity of sediment-laden flow based on the equation of total tress force,then,the paper has deduced the mixing-length formula of sediment-laden flow.Flume materia shows the validity of the formula and the analogy of the sediment ladenflow to atmospheric stratification flow.