挟沙水流床面冲刷深度试验研究

在清水冲刷粗化层极限冲刷深度研究的基础上,结合室内概化水槽试验,探讨了挟沙水流床面冲刷问题。不同来沙条件下床面冲刷深度水槽试验观测成果表明,随着上游单宽加沙率的增加,挟沙水流床面冲刷深度减小,挟沙水流相对冲刷深度与相对来沙条件呈线性变化趋势。参考爱因斯坦推移质输沙率公式,建立了一个能够综合反映来水来沙条件以及床面条件的床面冲刷深度计算公式。该公式计算值与试验实测值吻合良好。

Experimental study on riverbed erosion depth of sediment-laden flow

Based on the research of limit scour depth of rough layers scoured by clean water, and by combining with the indoor generalized flume experiment, we explored the erosion issues of river bed scoured by sediment-laden flow. The experimental re-sults of the scouring depth under different sediment supply show that with the increase of sediment supply rate per unit width, the scour depth decreases, and there is a linear correlation between relative scour depth and relative sediment conditions. On the ba-sis of Einstein bed load transport rate formula, we established a calculation formula of bed scour depth considering the runoff, sediment and bed conditions. Comparison of the calculated value and the measured value shows that the calculated values agree well with the measured ones.