摘要
悬移质水流挟沙能力与输沙特性对于冲积河流泥沙冲淤、河床演变影响很大。作者在对我国广泛应用的悬移质挟沙力半经验性公式进行分析基础上 ,指出了这类公式应用的局限性 ,并通过试验研究提出了悬移质水流挟沙能力的新关系式 ,同时对输沙平衡时的临界不淤流速及临界坡降等表达式进行了探讨 ,文中结论的应用限于S =2～ 4 0kg m3中低含沙量的情况。
In China the empirical formula of sediment-carrying capacity of flow with suspended load, eq.7, is widely used. However the limitation in use of eq.7 is obvious. Based on the theory of turbulent diffusion and considering the flow with suspended load as the heterogenous two phase flow, and also by flume experiments, a new formula of sediment-carrying capacity of flow with sediment content S<40 kg/m+3 is developed. The formula, without any unknown coefficient, is verified by other experimental data. By using the new formula, some characteristics of flow in equilibrium of sediment transport, such as the deposit velocity and critical grandient of flow are provided.
出处
《泥沙研究》
CSCD
北大核心
2003年第3期30-34,共5页
Journal of Sediment Research
基金
国家自然科学基金资助项目 ( 4 983 10 10 )
