悬移质近底参考面平衡浓度的一个计算公式--对Lane与Kalinske模式的改进

根据推移质与床沙交换、悬移质主要与推移质交换的物理背景，采用Einstein床面泥沙的起动概念及推移运动概率函数表征床面泥沙起动及推移运动，采用Lane与Kalinske提出的泥沙因水流垂向脉动而进入悬浮运动的模式表征推移质进入悬浮运动的过程，建议一个床面层高度，建立了一个悬移质近底平衡浓度的一个计算公式。公式的参数由实测资料确定，公式经过了独立资料的检验，计算精度在可以接受的范围内。基于本文建议的床面层高度及参考面平衡浓度公式，建立了悬移质输沙率计算方法，取得了满意的输沙率计算精度。对于细颗粒泥沙的悬移质输沙率计算，本文公式克服了Einstein方法的缺陷。

A formula for equilibrium concentration of suspended sediment at near-bottom reference level:modifications of Lane and Kalinske's type model

On the basis of the physical background that bed loads exchange with bed materials and suspended sediments mainly exchange with bed loads, this paper uses Einstein's bed load theory to characterize the initiation motion of bed material and bed load transport, uses Lane and Kalinshe's theory, in which river bed sands are entrained into suspension by vertical flow fluctuations, to describe the process of the lifted bed sands coming into suspension motion, suggests a thickness of bed layer, and finally establishes a formula for suspended sediment equilibrium concentration at near-bottom reference level. The present formula is calibrated with data set measured. It is verified by independent field data and flume test data, and the accuracy of the prediction is in an acceptable range. Based on the present definition of thickness of bed layer and the formula for equilibrium sediment concentration at it, this paper also gives a calculation method for suspended load transport, and this method gives a satisfactory accuracy in verification. As for suspended load transport of fine sand with a diameter less than 0.1mm, the present method overcomes the limitations of Einstein's one.