摘要
本文基于床沙宽度百分比及面积百分比的分析，选择上述二者有关参数来反映床沙表层不均匀分布特征，并由此得到了床沙不受隐蔽作用的最大粒径Ｄａ与面积平均粒径ｄｓ之关系。借助力学分析方法，分别得到了隐蔽区与暴露区的泥沙起动流速公式；同时，在输沙率关系中引入了宽度百分比Ｐｂ及ｄｓ，该式能较好地反映床沙粗化过程中，输沙率与表层泥沙组成之间的依存关系。
Based on the analysis of width and area gradation of bed material;the parmeters related are used for explaining the characteristics of bed material with non-uniform distribution.An equation between da and s is estaablished,By means of analysis of machanics,the formulas of the threshold motion velocity and transport rate of non-uniform sediment are eatablished.The formulas reflecte the inherent mechanics of the mutual conceal and reveal effect,At same time,the effect of non-uniform distrbution of bed material on transport rate of bed load may be accounted for.
基金
国家自然科学基金
三峡工程开发总公司资助
关键词
床沙
非均匀分布
推移质
输沙率
泥沙输移
non-uniform bed material,non-uniform distrbution,critical velocity,transport rate,bed load
