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.
关键词
非均匀沙/推移质输沙率/单双峰型级配/驼峰输沙率
Key words
non-uniform sediment/bed load transport rate/unimodal and bimodal particle gradations/hump transport rate
维普
万方数据