摘要
从非均匀沙受力分析出发 ,将非均匀泥沙起动所受到的附加作用力分为两部分。用滚动平衡方程式建立了能反映非均匀沙不均匀性的起动流速公式。利用天然河流实测资料和水槽实验资料率定计算公式中的系数 ,并用其它天然河流和水槽资料进行了验证。结果表明 。
According to the analysis on the forces acting on non-uniform sediment, the additional force is divided into two parts. One is caused by the interaction between coarse particles and fine particles of the bed material and another is caused by the flow structure near the riverbed. A formula for calculating the threshold velocity of the non-uniform sediment is established based on the critical condition of the particle begins to roll. Coefficients in the formula are determined both by flume experiment and field data. The validity of the formula is verified by another sets of experiment and field data.
出处
《水利学报》
EI
CSCD
北大核心
2002年第10期82-86,共5页
Journal of Hydraulic Engineering
基金
长江三峡工程泥沙问题"九五"项目 ( 95 -5 -4 )
国家自然科学委员会与水利部联合资助项目 ( 5 9890 2 0 0和498310 10 )
关键词
非均匀沙
起动规律
起动流速
附加阻力
水流结构
non-uniform sediment
incipient velocity
additional force
flow structure
