New hyperbolic tangent formula for mixing layer in vegetated flow
New hyperbolic tangent formula for mixing layer in vegetated flow
复制标题
DOI：
10.1016/j.jhydrol.2023.129061
复制
发表时间：
2023-02
影响因子：
6.4
通讯作者：
Han-qing Zhao;Wei‐Jie Wang;Yan-Fang Zhao;Xiao-Bo Liu;Qing-Chuan Chou;Yu Gao
中科院分区：
文献类型：
--
作者：
Han-qing Zhao;Wei‐Jie Wang;Yan-Fang Zhao;Xiao-Bo Liu;Qing-Chuan Chou;Yu Gao
利用实验数据和文献资料研究了植物混合层中的流速分布，发现流速分布的拐点与植物混合层的中间位置并不一致。针对这一问题，对适用于平面混合层的双曲正切公式进行了修正，对拐点进行了修正，并在自由流区和穿透区采用了不同的特征尺度。针对植被顶面流速的预测问题，建立了一种基于相关分析的植被顶面流速计算方法。建议的公式产生显着的改进，在表示测量的速度分布在植被明渠流。与以往的公式相比，修正后的公式在显示更好的相似性，在很大范围内的流量和植被条件下的实测流速剖面。研究结果为植被混合层的高精度计算提供了技术支持。
Flow velocity profile in the vegetal mixing layer was investigated using data collected in the present experiments and those reported in the literature, which indicates that the inflection point of the velocity profile does not coincide with the middle position of the vegetal mixing layer. Aiming to solve this problem, the hyperbolic tangent formula that is applicable to the plane mixing layer is modified by revising the inflection point and applying different characteristic scales in the free flow and penetration regions. For the problem of predicting flow velocity on top of vegetation, we constructed a new calculation method for flow velocity on top of vegetation based on correlation analysis. The proposed formula yields significant improvements in representing measured velocity profiles in the vegetated open channel flows. In comparison with previous ones, the modified formula performs better in exhibiting the similarity of measured velocity profiles over a wide range of flow and vegetation conditions. The research results provide technical support for the high precision calculation of the vegetated mixing layer.