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基于结构两相流模型和PIC数值计算方法 ,本文探讨了稀性泥石流堆积过程中的泥沙分选特征 .文中的模型可以模拟阵性泥沙流的非稳定特性 ,通过将传统的Euler和Lagrangian方法结合泥沙流运动的整个过程都能够采用多组分流元模型进行很好的描述 .该模型也能够合理描述泥沙分选过程中伴随的冲淤过程 .文中采用 2～ 5°的坡度 ,固相颗粒被分为三组粒径不同的组分 .研究表明 ,泥石流的垂向和横向分选都不明显 ,但是纵向分选较为明显 .河槽坡度和泥石流的密度是影响泥石流分选过程的两个关键因素 .泥沙输移能力越大 ,颗粒分选越不明显 ,对泥石流分选特性的定量预测有助于深入了解泥石流的沉积机理和泥石流灾害的防治
Based on the structural two-phase flow model and PIC numerical calculation method, this paper discusses the sediment sorting characteristics of the dilute debris flow accumulation process.The model in this paper can simulate the unsteady characteristics of the sediment flow. By combining the traditional Euler and Lagrangian The method combined with the flow of sediment flow can be well described by the multicomponent flow element model.The model can also reasonably describe the scouring and silting process accompanying with the sediment sorting process.The slope of 2 ~ 5 °, The solid-phase particles are divided into three groups with different particle sizes.The results show that the vertical and horizontal sorting of debris flow are not obvious, but longitudinal sorting is more obvious.The slope gradient and the density of debris flow are the influencing factors of debris flow sorting process Two key factors: the larger the sediment transport capacity, the less obvious the particle sorting, and the quantitative prediction of the characteristics of debris flow can help to understand the sedimentation mechanism of debris flow and the prevention and control of debris flow hazards