Drag coefficient for rigid vegetation in subcritical open-channel flow
Drag coefficient for rigid vegetation in subcritical open-channel flow
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DOI：
10.1007/s10652-017-9534-z
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发表时间：
2017-05
影响因子：
2.2
通讯作者：
Xiaoguang Liu;Y. Zeng
中科院分区：
文献类型：
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作者：
Xiaoguang Liu;Y. Zeng
阻力系数通常用作表示植物阻力的量化参数，即植被对水流的阻力。在本研究中，收集了先前研究报告的亚临界明渠流中刚性植被阻力系数的测量数据并进行了预处理，以进行多参数分析。弗劳德数（Fr）对亚临界流中刚性植被阻力系数的影响不可忽视，尤其是当。观察到阻力系数随茎雷诺数（Rd）呈指数下降，并随植被密度（λ）呈对数下降。相对淹没度（h*）对阻力系数有显着影响，并总结出正对数关系。对Fr进行除法，得到简化的三阶段经验公式。实验室测试证明，本经验模型与现有模型相比具有更高的精度。
Drag coefficient has been commonly used as a quantifying parameter to represent the vegetative drag, i.e., resistance to the flow by vegetation. In this study, the measured data on the drag coefficient for rigid vegetation in subcritical open-channel flow reported in previous studies are collected and preprocessed for multi-parameter analysis. The effect of Froude number (Fr) on the drag coefficient for rigid vegetation in subcritical flow cannot be ignored, especially when. The drag coefficient is observed to exponentially decrease with the stem Reynolds number (Rd) and logarithmically decreased with the vegetation density (λ) when. The relative submergence (h*) has a significant effect on the drag coefficient, and a positive logarithmic relationship is summarized. A simplified three-stage empirical formula is obtained based on the divisions ofFr. Laboratory tests (with) prove that the present empirical model has higher precision compared with existing models.