Predicting Dispersion Coefficient of Streams
Predicting Dispersion Coefficient of Streams
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DOI：
10.1061/jeegav.0000605
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发表时间：
1977-02
期刊：
影响因子：
--
通讯作者：
Henry Liu
中科院分区：
文献类型：
--
作者：
Henry Liu
本文通过检验分析，导出了天然河流纵向弥散系数与流量、水力半径等几个总体流量特性之间的简单关系式。结果表明，该公式的无因次因子β与Elder方程的无因次弥散系数α不同，与天然河流的大小无关。对现有数据的分析表明，任何水流的β值都可以根据水流的摩擦系数或阻力系数在6倍以内预测。这意味着所提出的预测纵向弥散的方程比任何现有的基于整体流动特性的方法更准确。
Using inspectional analysis, a simple formula has been derived which relates the longitudinal dispersion coefficient of natural streams to several bulk flow properties such as the discharge and the hydraulic radius. It is shown that the dimensionless factor, β, of the formula, unlike the dimensionless dispersion coefficient α based on Elder's equation, is independent of the size of natural streams. An analysis of existing data indicates that the value of β for any stream may be predicted within a factor of six from the frictional or resistance factor of the stream. This means the proposed equation for predicting longitudinal dispersion is more accurate than any existing method based on bulk flow properties.