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稀性泥石流具有很强的输沙能力,可在运动过程中强烈刷深泥石流沟道。以理论分析和野外水槽试验相结合,对稀性泥石流的冲刷规律进行了初步的探讨研究。沟床物质的初次冲刷应该考虑非均匀床沙是否会发生粗化,因此根据沟床物质在稀性泥石流的冲刷作用下形成粗化层的临界判别条件,将稀性泥石流的冲刷归纳成3种不同的模式,并分别推导了这3种不同冲刷条件下,床面冲刷深度的计算方法。然后进一步通过野外水槽试验探讨了床沙全沙输移情况下,沟床冲刷系数的取值。稀性泥石流累次冲刷问题的关键是前一次冲刷形成的床面结构是否会破坏或再生,本文最后结合野外水槽试验中累次冲刷的试验结果,分析了沟床累次冲刷深度的计算方法。
Thin debris flow with a strong sediment transport capacity, strong brush in the process of moving deep debris flow channel. With the combination of theoretical analysis and field test, a preliminary study on the scouring rules of dilute debris flow was carried out. The initial scouring of gully material should consider whether the inhomogeneous bed sand will be roughed. Therefore, based on the critical discriminant conditions of gully material formation under the scour of dilute debris flow, the scouring of dilute debris flow is classified into three types Different patterns and deduced the calculation methods of bed erosion depth under the three different scouring conditions respectively. And then through the field of sink test to explore the case of bed sediment transport, gutter bed erosion coefficient value. The crux of the frequent erosion problem of dilute debris flow is whether the bed structure formed by the previous erosion will be destroyed or regenerated. Finally, combined with the test results of the repeated scour in the field sink test, the calculation method for the depth of the furrow erosion is analyzed.