Quantitative definition of Shields criterion for incipient sediment motion  

作　　者：Nian-Sheng Cheng Chengxiao Lu Yesheng Lu Maoxing Wei Lichan Zheng 

机构地区：[1]Ocean College,Zhejiang University,Zhoushan 316021,Zhejiang,China

出　　处：《International Journal of Sediment Research》2024年第1期61-69,共9页国际泥沙研究（英文版）

基　　金：the National Natural Science Foundation of China(Grant Nos.52339005,51979242,and 52109103).

摘　　要：The Shields diagram has been widely used in the description of the threshold condition for incipient sediment motion.Because the current definition of the Shields criterion is generally subjective,the relevant data are subject to high uncertainty.To date,several efforts have been made to define the threshold condition quantitatively,but they are all based on certain low bedload rates that were empirically chosen.The current study aims to provide a theoretical framework to quantify the Shields criterion based on the concept of the pickup probability of sediment particles.The results show that the Shields criterion can be reasonably described with a low pickup probability(p=1%),which can be further converted to a low dimensionless bedload rate(ie.,φ/θ^(1.5)=0.13,where φ is the Einstein number and θ is the Shields number).The new approach is finally validated with experimental data of bedload rates published in the literature.

关 键 词：Incipient sediment motion Shields criterion Pickup probability Critical shields number 

分 类 号：P731.22[天文地球—海洋科学] P737