Modeling the longitudinal profiles of streamwise velocity in an open channel with a model patch of vegetation
Modeling the longitudinal profiles of streamwise velocity in an open channel with a model patch of vegetation
复制标题
使用植被模型斑块模拟明渠中水流速度的纵向剖面
DOI：
10.1007/s10652-020-09747-5
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发表时间：
2020-06
影响因子：
2.2
通讯作者：
Liu Xingnian
中科院分区：
文献类型：
--
作者：
Yan Chunhao;Shan Yuqi;Sun Wei;Liu Chao;Liu Xingnian
本文提出了一种用植被模型斑块预报明渠纵向流速剖面的模型。从动量方程和流动连续性方程出发，推导出控制方程。该模型可以估计植被斑块内部和外部的纵向速度分布。室内试验表明，斑块内部和相邻裸槽中的流速在纵向上具有相同的调整距离，但由于植被阻力驱动着斑块内的水流流向邻近裸槽，因此具有不同的趋势。该模型考虑了补丁上游和内部两个流量调节区内不同的无量纲参数。使用来自不同来源的16组实验数据对模型进行了验证。该模型能够模拟圆柱体或圆柱状植物斑块内外的速度纵向分布。与以前的模型相比，本模型提高了速度纵剖面的建模精度。
This paper proposes a model for predicting the longitudinal profiles of streamwise velocities in an open channel with a model patch of vegetation. The governing equation was derived from the momentum equation and flow continuity equation. The model can estimate the longitudinal profiles of velocities both inside and outside a vegetation patch. Laboratory experiments indicate that the longitudinal profiles of velocities inside a patch and in the adjacent bare channel have the same adjustment distance in the longitudinal direction, but the profiles have different trends because the vegetation drag drives the flow from the patch to the adjacent bare channel. The model considers different dimensionless parameters in two flow adjustment regions upstream of and inside the patch. Sixteen sets of experimental data from different sources are used to verify the model. The model is capable of modeling the longitudinal profiles of velocities inside and outside patches of cylinders or cylinder-like plants. Compared to a previous model, the current model improves the modeling accuracy of longitudinal profiles of velocities.
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