摘要
非均匀沙运动规律与均匀沙明显不同。本文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 ,推出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。同时得到了均匀沙的起动公式 ,其系数涵盖了其它均匀沙公式。说明本文公式较好的反映了非均匀沙的起动特性。
Obvious differences of transport mechanism exist between the uniform and non uniform sediment.In this paper,the formula of calculation threshold velocity of non uniform sediment is established in consideration of their relative degree of exposure,and the additional mass force,etc.Coefficients in the formula are determined based on the experiments and field data.The theoretical formula has been verified with factual data,it's the better reasonable formula compare with the others that we collected.The computed results reflect the characterisitcs of threshold motion of non uniform sediment.The formula for uniform sediment is established also, its coefficients include others formula.
出处
《水力发电学报》
EI
CSCD
北大核心
2002年第2期72-77,共6页
Journal of Hydroelectric Engineering
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
非均匀沙
起动公式
相对暴露度
附加质量力
切应力
non uniform sediment
formula of threshold velocity
relative degree of exposure
additional mass force
the flow shear stress
