摘要
非均匀沙运动规律与均匀沙明显不同。故从非均匀沙起动的特点出发 ,阐述了其运动机理 ,采用滚动起动模式。通过对附加质量力的概念及表达式和相对暴露度参数的引入 ,推得了非均匀沙起动公式。并用实测资料进行了验证 ,同其它学者们的公式相比较为合理。作为特例得到了均匀沙的起动公式 ,该系数包含了其它公式。
Obvious differences of transport mechanism exist between the uniform and non uniform sediment. In this paper, the formula of calculating threshold velocity of non uniform sediment is established in consideration of their relative degree of expose, and the additional mass force, etc. Coefficients in the formula are determined based on experimental and field data. Verifications with measured data show that the theoretical formula is the best reasonable formula comparing with the others that were collected. The computed results fully reflect the characteristics of threshold motion of non uniform sediment. The formula of uniform sediment is established also, as a special case.
出处
《泥沙研究》
CSCD
北大核心
2002年第5期67-70,共4页
Journal of Sediment Research
基金
国家自然科学基金和水利部联合资助重大项目 (5 9890 2 0 0 )
九五课题资助 (95 5 4)
关键词
泥沙起动规律
附加质量力
相对暴露度
运动机理
受力分析
formula of threshold velocity
non uniform sediment
additional mass force
relative degree of expose
