水库异重流潜入点深度预测模型

Predicting Model for the Plunging Depth of the Reservoir Density Currents

研究水库异重流的输沙和排沙特性,首先要研究异重流的形成条件,通常是根据异重流潜入点的深度与水库水深的关系判别异重流的形成。通过研究一经过有坡度的浅河道进入水库的悬浮流体,应用连续方程、质量和动量守恒方程以及混掺缓慢变化的动量方程研究异重流潜入现象,根据控制问题的参数建立潜入点深度预测模型,这些预测参数包括密度佛汝德数F0,初始混合率γ,底坡S和全摩擦系数ft。这里提出的潜入点深度模型与实验室异重流和水库异重流观测数据吻合良好。

In order to study the sediment transport and sediment ejection characteristics of the reservoir density currents,we must firstly study plunging conditions.The density current plunging position may be determined by the relation of the reservoir water depth and the plunging depth of density currents.The research is mainly focused on the suspending fluid entering into the reservoir from an inclined bottom slope shallow river.In the course of the research and the analysis,the equation of continuity and conservation of momentum,as well as slowly changing mixed-doped momentum equation is used to study plunging phenomena.According to the parameters of control points,the predicting model is established.Parameters include density Froude number F0,initial mixing rate γ,reservoir bottom slope S and coefficient of friction ft.The equation of the plunging depth is fit for the laboratory and reservoir field observation data.