摘要
基于等中值粒径的“单、双峰型级配”推移质输沙试验以及“驼峰”输沙率试验数据,选择Einstein、吴伟明、Wilcock和吴保生等4种典型非均匀推移质输沙率公式计算“单、双峰型级配”推移质输沙率,将两种级配的输沙率比值及曲线形态与试验成果对比分析。结果表明:吴伟明公式在反映“单、双峰型级配”推移质输沙差异上表现最好,这4种公式均无法反映“驼峰”输沙率现象。基于多参数考虑的Patel公式较这4种公式能更好地反映上述两种现象。充分考虑床沙级配对分组沙起动切应力和输沙有效Shields数的影响,是提高非均匀推移质输沙率公式精度和适用性的关键。
Based on the"unimodal and bimodal gradation"bedload transport experiments with equivalent me-dian particle size and the"hump"sediment transport rate experiment,four typical non-uniform bedload trans-port rate formulas of Einstein,Wu Weiming,Wilcock and Wu Baosheng have been selected to calculate the"unimodal and bimodal gradation"bedload transport rate.After comparing the calculated the ratio of bedload transport rate and the curve shape with the experiment results,it can be found that:Wu Weiming formula has the best performance in reflecting the difference of"unimodal and bimodal gradation"bedload transport.How-ever,these four formulas cannot reflect the phenomenon of"hump"sediment transport rate.Patel formula based on multi-parameters can better reflect the above two phenomena than these four formulas.The key to im-prove the accuracy and applicability of the formula is to fully consider the influence of sediment gradation on the incipient shear stress of grouped sediment and effective Shields numbers for sediment transport.
作者
饶璋超
罗永钦
袁强
付俊峰
RAO Zhang-chao;LUO Yong-qin;YUAN Qiang;FU Jun-feng(College of Electrical Engineering,Kunming University of Science and Technology,Kunming 650500,China;Key Laboratory of Water Ecology and Flow Structure Engineering in Yunnan Province,Kunming 650500,China)
出处
《泥沙研究》
CAS
CSCD
北大核心
2024年第2期17-24,共8页
Journal of Sediment Research
基金
云南省基础研究计划项目青年项目(202101AU070156)
云南省基础研究计划项目面上项目(202301AT070437)
云南省国际河流与跨境生态安全重点实验室开放基金(KKZ6202104005)。
关键词
非均匀沙
推移质输沙率
单双峰型级配
驼峰输沙率
non-uniform sediment
bed load transport rate
unimodal and bimodal particle gradations
hump transport rate
