摘要
通过理论及资料分析研究了清水、低含沙水流和高含水流的紊动粘性系数变化规律。结果表明，考虑紊流相干结构的清水水流紊动粘性系数随尾迹强度的增加或减小而相应增减。低含沙水流紊动粘性系数随含沙量增加而减小，即挟沙后水流紊动强度减弱。高含沙水流紊动粘滞系数更是如此，且垂向最大值偏高中间水深向下移。紊动粘性系数与会沙量、冲刷、淤积状态有关，宾汉极限剪切力对紊动粘性系数有较大影响。
urbulent viscosity of clear water flow , flow of low sediment concentration,and hyperconcentrated flow has been studied theorelically and through data analyas. It has been shown that the turbulent visccoity of clear water flow is affected by wake strength and de-creases with incrensing wake strength. The turbulent viscosity of flow with low ediment concentration decreases with incrcasing sediment concentration. The turbulent viscosity of hy porconcentrated flow furthur decreases.It is related with sediment concentration and the state of deposition and erosion. Bingham shear stress has grcat effect on turbulent viscosity. The relation between turbulent visconsitv andsediment concentration has been obtained in the paper.
出处
《河海大学学报（自然科学版）》
CAS
CSCD
1994年第1期20-25,共6页
Journal of Hohai University(Natural Sciences)
关键词
紊动
高含沙水流
冲刷
淤积
Turbulent、viscosity coefficient Silt- hyporconcentrated flow Bingham shear stress Erosion Deposition
