TRANSPORTATION CHARACTERISTIC OF BED LOAD FOR NON-UNIFORM SEDIMENT WITH EQUIVALENT GRAIN

查看全文 作　　者：He, Wen-[1]She; Cao, Shu-[1]You; Fang, [1]Duo; Liu, Xing-[1]Nian; Yang, Ju-[1]Rui

机构地区：[1] Hydraulics Lab. of High Speed Flows, Sichuan Univ., Chengdu 610065, China

出　　处：《Journal of Hydrodynamics》索引2002年第14卷第3期,共5页

基　　金：theNationalScienceFoundationofChinaandtheMinistryofWaterConservancyofChina (No :5 9890 2 0 0 ) ;andbytheFoundationfromtheMinistryofWaterConservancyofChina.(No :95 5 4 ) 摘　　要：The incipient velocity of sediment is one of the most important basic theory problems of hydraulic engineers. The initial motion of sediment is a random process. Based on the combination methods of classical mechanics with statistics theory the formula to calculate the incipient motion of sediment was established. According to the standard of incipient motion, motion status, relative degree of expose for sediment and equivalent grain was defined in this paper. The coefficient in the formula included the flow fluctuation and relative degree of exposition. The value of the coefficient was calculated by using some parameters value. The results show that the value of dimensionless shear stress coefficient is not a constant, but locating in a range from 0.022 to 0.063 to weak and middle motion status, and varying with the relative degree of sediment expose. The value of dimensionless Shields numbers that put forward in the text can explain the reason that why the coefficients in difference formulas have wide scatter. The theoretical formula has been verified with amount of data collected from both natural rivers and flumes. The results can reflect the motion characteristic of the sediment. 关键词：incipient motion EQUIVALENT DIAMETER SHEAR stress BED load transport

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TRANSPORTATION CHARACTERISTIC OF BED LOAD FOR NON-UNIFORM SEDIMENT WITH EQUIVALENT GRAIN

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