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中文摘要：
分析表明运用等效粒径概念进行非均匀沙起动条件计算是十分方便的。利用现有河流动力学的成果,通过一定的转换,获得了较有影响的八家非均匀沙起动公式的等效粒径表达式,研究发现尽管它们都能反映出较细颗粒受到荫蔽作用、较粗颗粒受到暴露作用的特性,但各家公式中区分泥沙颗粒受到荫蔽或暴露作用的特征粒径是不同的。分析了各家公式反映出的非均匀沙起动时的分选作用。运用长江万县站资料对比研究了各家等效粒径计算式,为长江万县段合理选用非均匀卵石起动条件提供了依据。
英文摘要：
It is convenient to use the concept of equivalent grain size to describe the incipient motion condition of non-uniform sediment.Through a conversion of the existing eight famous formulas of incipient motion into the form of equivalent grain size,it was found that all the formulas can represent the effects of fine grains sheltering and coarse grains exposure to a certain degree,but their threshold sizes of the two grain groups are different.These formulas＇ sorting effect in the incipient motion of non-uniform sediment is discussed.By a test calculation of the pebbles at the Wanxian station on the Yangtze,the results of these formulas are compared with field data,which is useful to selecting appropriate incipient equation for the Wanxian reach.
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Analysis of Runoff in Ungauged Mountain Watersheds in Sichuan, China using Kinematic-wave-based GIUH
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