多沙河流平面二维泥沙数学模型研究

针对冲积河流河床演变速度快、边界调整幅度大的特点,采用积分方法数值求解水流泥沙基本方程,建立了适合于多沙河流泥沙及河床演变规律的二维数学模型,在数值方法方面考虑了物质守恒性及对多变边界的适应性,采用了比较简单的动边界处理模式。通过工程实例的计算验证,证实了模型所采用的基本方法是合理的,模型有较强的河床边界适应能力,可用以解决有关多沙河流河床演变预测及浑水洪水预报的有关问题。

A 2-D Numerical Model on the Fluvial Process in the High Sediment Laden Flow River

With special considerition on the conservation of mass, the effect of sediment deposition and entrainment on the water continuity is reflected in a numerical model.A simple method was used to apply for the frequent variation of water boundary conditions in high sediment laden flow river.A mixed method was employed to solve the numerical equations of water and sediment movement, and finally, a special flood process in the Lower Yellow River was calculated with the model to verify the applicability for the high-sediment laden flow river.