The size distribution of the armor layer in mountain rivers is an important factor affecting the stability of the river bed. However, there are relatively few studies on the prediction of the armor layer size distribution in the reconstruction process after the instability of the previous static armor layer. In response to the above challenges, this paper takes the incipient probability of sediment particles as the starting point, and comprehensively considers the coupling relationship between the initial bed materials, the bed structure, the armor ratio and flow intensity, a simple calculation model for predicting the static armor layer size distribution after the reconstruction of gravel-river bed is established. This paper introduces the concept of the critical incipient particle size , and considered that the sediment particles smaller than will incipient relatively easy, and the probability of being washed out is greater, while the incipient probability of sediment particles larger than (this part of the large-particle sediment includes not only the original particles on the bed surface, but also the large sediment particles exposed by the erosion of the bed subsurface) is relatively small. At the same time, this model also uses the armor ratio to reflect the bed surface structure impact. This paper cites data from five sets of laboratory flume experiments to verify the calculation model, and the experimental result shows that the calculation results of the model are in good agreement with the experimental measured data, especially in predicting the median diameter of the static armor layer. Our calculation model provides certain theoretical guidance for the study of mountain river bed stability and earthquake prevention and disaster reduction.

中文翻译：

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砾石河床改造后静力装甲层尺寸分布预测计算模型研究

山区河流装甲层的大小分布是影响河床稳定性的重要因素。然而，在先前的静态装甲层不稳定之后，在重建过程中对装甲层尺寸分布的预测的研究相对较少。针对上述挑战，本文以沉积物颗粒的初始概率为出发点，综合考虑了初始床层材料，床层结构，装甲比与流场强度之间的耦合关系，建立了简单的预测模型。建立了砾石河床改造后的静态铠装层尺寸分布。本文介绍了临界初始粒度的概念，并认为小于的沉积物颗粒较容易发生沉淀，被冲走的可能性较大，而大于的沉积物颗粒的初期发生概率（这部分大颗粒沉积物不仅包括床层上的原始颗粒表面，但由于床底下的侵蚀而暴露出来的较大的沉积物颗粒相对较小。同时，该模型还使用装甲率来反映床面结构的冲击。本文引用了五组实验室水槽实验的数据对计算模型进行了验证，实验结果表明该模型的计算结果与实验实测数据吻合较好，特别是在预测静态铠装层中值直径方面。