中文摘要：

碎片流动的谷物作文从液体更加变化到沉积物，使估计流动性质不明确(例如，密度，速度和分泌物) 使用是的沉积物在实践做。因为每个碎片流动事件由在性质和流动政体是不同的一系列巨浪组成，跟踪谷物作文的变化比估计流动的一些某些性质因此是更重要的。我们发现碎片流动的材料，液体和来源土壤，在 P (D)= CD 的一种形式满足通用谷物尺寸分布( GSD )- exp (付款交丹 _c ),在哪儿参数 C ，并且 D _c 被适合功能到谷物尺寸频率决定。一小 ? 潴漠瑢楡? 敳浧湥慴楴湯爠獥汵獴戠 ? 潣摮 ' 讟 N 杮琠敨瀠瑡整湲挠慬獳晩捩瑡潩 ? 湩映慥畴敲猠慰散记 ? 记？？

英文摘要：

Grain composition of debris flow varies considerably from fluid to deposit, making it uncertain to estimate flow properties （e.g., density, velocity and discharge） using deposit as done in practice. Tracing the variation of grain composition is thus more important than estimating some certain properties of flow because every debris flow event consists of a series of surges that are distinct in properties and flow regimes. We find that the materials of debris flows, both the fluid and the source soils, satisfy a universal grain size distribution （GSD） in a form of P （D） = CD-zexp（-D/Dc）, where the parameters C, p and De are determined by fitting the function to the grain size frequency. A small At implies a small porosity and possible high excess pore pressure in flow; and a large D~ means a wide range of grain composition and hence a high sediment concentration. Flow density increases as 11 decreases or Dc increases, in a power law form. A debris flow always achieves a state of certain mobility and density that can be well described by the coupling of p and Dc, which imposes a constraint on the fluctuations of flow surges. The GSD also describes the changes in grain composition in that it is always satisfied during the course of debris flow developing. Numerical simulation using the GSD can well illustrate the variation ofμ and Dc from source soils to deposits.