均匀泥沙相对暴露度的试验研究

Study on relative exposure degree of uniform sediment

以杨奉广建立的相对暴露度概念为基础，通过自行设计的试验装置，测量了均匀玻璃球的暴露角和河卵石的绝对暴露度，分析计算了其相对暴露度及其分布规律。结果表明，玻璃球相对暴露度取值范围介于0～0．5之间，暴露角呈正态分布，相对暴露度呈偏正态分布；在此基础上，利用实测资料对暴露角正态分布公式中的系数进行了率定，通过暴露角和相对暴露度概率密度函数转换，给出了相对暴露度概率密度函数；河卵石相对暴露度取值范围也介于0～0．5之间，相对暴露度呈偏正态分布，与本文公式的分布曲线不完全重合，说明河卵石复杂外形、粒径和形心的不同对其相对暴露度概率密度分布曲线的影响较大。

Based on the concept of relative exposure degree proposed by Yang Fengguang, the exposure angle and absolute exposure degree of the uniform glass ball and cobble were measured through a self-designed experimental device, and the relative exposure degree and its distribution rules were calculated and analyzed. The results show that the value of relative exposure degree of glass ball ranges from 0 to O. 5, the exposure angle meets for normal distribution and the relative exposure degree meets for skewed normal distribution. Based on the measured data of the exposure angle, the coefficient of the normal distribution formula was determined, and the probability density function of the relative exposure degree was acquired. The value of relative exposure degree of cobble ranges from 0 to 0.5 either, and the relative exposure degree of cobble also meets for skewed normal distribution, but it doesn＇ t coincide with that of glass ball, which shows that there is a significant influence on the probability density function of relative exposure degree for the complex shape, size and core of cobbles.