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本文在分析非均匀沙床面颗粒随机分布特性的基础上，对床面颗粒暴露度函数关系进行了分析，通过简化颗粒的排列方式，利用分形理论研究了初始及粗化床面糙度的分形特征，结合实验资料讨论了床面糙率ｎ与糙度分维数Ｄ的关系，并与床面糙率ｎ和代表粒径（ｄ５０、ｄ９０）的关系进行了比较，初步认为对于初始床面分维数与床面糙率具有更好的相关关系，而粗化床面两者代表性基本一致，为更好地研究床面糙率、泥沙起动及其输沙过程提出了一种新的研究方法．
In this paper, based on the analysis of random distribution characteristics of non-uniform sand bed particles, the correlation function of bed particle exposure is analyzed. By simplifying the arrangement of particles, fractal theory is used to study the fractal of the initial and roughed bed surface roughness The relationship between the roughness n of the bed and the fractal dimension D was discussed based on the experimental data. The relationship between the roughness n and the representative particle size (d50, d90) was compared. It is preliminarily considered that for the initial bed The fractal dimension has a better correlation with the roughness of the bed surface, while the representation of the coarsening bed is basically the same. In order to better study the bed roughness, sediment start and sediment transport, Research methods.