泥沙悬浮的特征长度和悬移质浓度垂线分布

通过对紊动水流中混合掺长概念的类比,本文引入了泥沙作悬浮运动的特征长度的概念并讨论了其表达式的确定方法,从而在未经引入任何流速分布公式的情况下得到了一个悬移质浓度分布的统一公式,几乎所有已有各家公式均为本公式的特例。本文所采用的方法具有许多优点,采用本文的有关结果也便于从统一的高度来分析以往类似公式之间的内在联系、各公式的合理性及局限性。

Characteristic Length and Vertical Concentration Distribution of Suspended Sediment

By an analogy to the mixing length concept in fluid mechanics, the concept of characteristic length for the vertical motion of sediment particles is introduced in this paper. The relation between the characteristic length and the vertical concentration profiles are fully discussed. As a result, the existed formulae are evaluated from the present viewpoint and new generalization of those results are achieved. Based on the method presented here, the relations among the existed formulae, their applicabilities, limitations, etc. can be easily studied.