Computation of flow velocity in rough channels
Computation of flow velocity in rough channels
复制标题
粗糙通道中流速的计算
DOI：
10.1080/00221686.2006.9521728
复制
发表时间：
2006
影响因子：
2.3
通讯作者：
M. Greco
中科院分区：
文献类型：
--
作者：
D. Termini;M. Greco
水流流速剖面的准确估算对于科学研究和解决泥沙输移、污染物输移、水流阻力等工程问题都具有重要意义。本文提出了一个新的经验公式来表示垂直速度剖面。该方程实质上是壁面对数定律的修正形式，包含三个具有明确物理意义的参数。利用不同来源的实验数据验证了该方程的适用性及其对不同水力条件（包括非均匀条件）的精度评估。由最佳拟合的法律所选择的实验数据确定的均方误差的值，与文献中提出的应用其他方程所获得的。比较突出表明，拟议的法律允许复制所有的水力条件检查保持可接受的值的均方误差。
Accurate estimate of flow-velocity profile is of crucial importance both for scientific purposes and for solving numerous engineering problems that include, among others, sediment transport, contaminant transport, flow resistance evaluation. This paper presents a new empirical equation to represent the vertical velocity profile. The proposed equation is essentially a modified form of the well-known logarithm law of the wall and contains three parameters having a clear physical meaning. The applicability of the equation and its accuracy assessment for different hydraulic conditions, including non-uniform conditions, is verified by using experimental data obtained by different sources. The values of the mean square errors determined by the best-fitting of the law to the selected experimental data, are compared with those obtained by applying other equations proposed in literature. The comparison highlights that the proposed law allows the reproduction of all the hydraulic conditions examined maintaining an acceptable value of the mean square error.