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An Approach to Determine the Velocities for Non-homogeneous Debris Flow

机译：一种确定非均相碎屑流速的方法

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Debris flow with a large amount of solid particles from clay or silt to boulder in the mountainous area of the west China frequently behaves characteristics of non-homogeneous flow. According to the principle of the minimum energy dissipation, a critical diameter between the coarse and fine particles in non-homogeneous flow was determined, and the coarse particles are regarded as solid phase with the more critical diameter, the fine particles with the diameter less critical diameter and water are composed of liquid phase. Based the concept of the critical diameter, non-homogeneous debris flow may be divided into solid and liquid two-phase flow. A new velocity expression for liquid phase flow may be derived from the modified manning's formula based on theoretical analysis and our experimental data. Furthermore, the velocity of solid phase flow has been established from the law of mass conservation of solid and liquid phases. It has been verified that that calculating value using the velocity formulas of solid and liquid two-phase flow is basically corresponding to the measured data from Jiangjia gully, Yunnan Province, China. There comes to some meaningful conclusions, for example velocity of solid phase is more than one of liquid phase due to the specific gravity higher than 2.234 of debris flow, whereas velocity of solid phase is usually less than one of liquid phase. These results are very significant for both developing dynamical model for non-homogeneous debris flow and designing of control engineering for debris flow disasters.
机译：在西部山区的粘土或淤泥到巨石中的大量固体颗粒的碎片流量经常表现出非均匀流动的特点。根据最小能量耗散的原理，确定了非均匀流动中的粗糙和细颗粒之间的临界直径，并且粗颗粒被认为是具有更致临界直径的固相，细颗粒直径不太关键直径和水由液相组成。基于临界直径的概念，可以将非均匀碎屑流分为固体和液体两相流。基于理论分析和我们的实验数据，可以从改进的曼宁配方中衍生出液相流的新速度表达。此外，已经建立了固体恒温法的固相流速的速度。已经验证，使用固体和液体两相流量的速度公式的计算值基本上对应于来自云南省云南省江嘉沟的测量数据。由于特异性重力高于2.234的碎片流动，有一些有意义的结论，例如固相的速度大于液相之一，而固相的速度通常小于液相的速度。这些结果对于开发非均匀碎片流动的动态模型以及用于碎片流动灾害的控制工程设计的动态模型非常重要。

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