非沙质河流平面二维流场冲刷模拟方法的研究

对溢洪道下游破碎基岩为主的非沙质河流冲刷进行了平面二维数值模拟计算方法的探讨。对破碎基岩为主的河床，缺乏准确表征床面稳定条件的控制方程，一般常规计算方法无法确定床面冲淤变化。利用河床勘测资料和模型实测试验数据，可以通过对表征河道床面稳定的抗冲特性分析，确定这类河道床面抗冲系数的平面分布。运用平面二维水动力学模型与河床辅助控制方程，得到了床面稳定时的河道平面冲刷分布。

Study on Scouring Simulation Method of Plane Two-Dimensional Velocity Field in Non-sandiness Rivers

In this paper, the plane two-dimension numerical simulation is used to study the scour in a river whose bed is mostly cracked bedrock at the lower reaches of a spillway. In the case of cracked bedrock, there is short of an accurate control equation to express the condition of bed surface stability, which leads to the difficult to determine the change of scouring and silting through the routine simulation. Field and expenimental data are used to analyse and generalize the erosion-resisting capability which expresses the capacity of bed surface stability, so the plane distribution of the erosion-resisting coefficient in a river bed can be determined. The plane two-dimension hydrodynamic mathematical model and the auxliary control equation of bed surface stability are used to get the plane distribution of scour and silting when the riverbed is stable.