关于悬移质输沙率计算模式的探讨

Calculation models for the suspended sediment transport rate

悬移质输沙率的计算精度受控于悬移质泥沙浓度的垂线分布C(y)、浑水流速分布U_m(y)及相对参考点浓度C_a,所采用的计算方法之可靠程度.而后者本身又是一些极其复杂的问题.鉴于通常所采用的浓度分布公式及流速分布公式都只是在某种特殊情形下才有效,本文将采用具有广泛通用性的浓度分布及流速分布的一般表达式来探讨悬移质输沙率的计算模式,并在此分析的基础上给出一种简单实用的计算方法.

The caculated transport rate of suspended seeliment is often greatly influenced by the determination of the velocity distribution, concentration and reference concentration. There fore, in this paper, great attontions have been paid on the following problems: (1) How to find a generalized model of the concentration distribution which is simple in form and can embrace most of the previous mode's. (2) How to choose the model of velocity distribution which has the same advantages as those of the concentration distribution model. (3) How to determine the reference concentration. Based on the above discussions, a generalized theoretical model of the suspended sediment transport rate has been developed, and the comparisons with other conventional formulas show that the model suggested in this paper is simple and reasonable.